Randy Kolka, PhD

Research Soil Scientist

Northern Research Station

0000-0002-6419-8218

randall.k.kolka@usda.gov

Publications & Products
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Education

Treesearch Publications

Karin Eklöf, Heleen de Wit, Chris S. Eckley, Collin A. Eagles-Smith, Sue Eggert, Robert W. Mackereth, Ulf Skyllberg, Liisa Ukonmaanaho, Matti Verta, Craig Allan, Erik J. S. Emilson, Karen A. Kidd, Carl P. J. Mitchell, John Munthe, Tapani Sallantaus, Joel Segersten, Andrea G. Bravo, Randy Kolka, Colin P. R. McCarter, Petri Porvari, Eva Ring, Stephen D. Sebestyen, Ulf Sikström, Therese Sahlén. Zetterberg. 2025. The Effects of Forest Harvesting on Total and Methylmercury Concentrations in Surface Waters Depend on Harvest Practices and Physical Site Characteristics
Jeffrey D. Wood, D. Tyler Roman, Timothy J. Griffis, Hinsby Cadillo‐Quiroz, Dennis Del Castillo, Lizardo Fachin, Erik Lilleskov, Randy Kolka, Jhon Rengifo, Craig Wayson. 2025. A Large Amazonian Peatland Carbon Sink Was Eliminated by Photoinhibition of Photosynthesis and Amplified Ecosystem Respiration
Patrick Nicolás Skillings-Neira, Juan C. Benavides, Michael J. Battaglia, Rodney A. Chimner, Laura Bourgeau-Chavez, Craig Wayson, Randy Kolka, Erik Lilleskov. 2025. Mapping the distribution and condition of mountain peatlands in Colombia for sustainable ecosystem management
Chetwynd Osborne, Spencer Gilbert-Parkes, Graeme Spiers, Louis James Lamit, Erik Lilleskov, Nathan Basiliko, Shaun Watmough, Roxanne Andersen, Rebekka E. Artz, Brian W. Benscoter, Luca Bragazza, Suzanna L. Bräuer, Michael A. Carson, Xin Chen, Rodney A. Chimner, Bev R. Clarkson, Andrea S. Enriquez, Samantha P. Grover, Lorna I Harris, Christina Hazard, John Hribljan, Sari Juutinen, Evan Kane, Klaus-Holger Knorr, Randy Kolka, Anna M. Laine, Tuula Larmola, Carmody K. McCalley, Jim McLaughlin, Tim R. Moore, Nadia Mykytczuk, Anna E. Normand, David Olefeldt, Virginia Rich, Nigel Roulet, Danielle L. Rupp, Jasmine Rutherford, Christopher W. Schadt, Oliver Sonnentag, Leho Tedersoo, Carl C. Trettin, Eeva-Stiina Tuittila, Merritt Turetsky, Zuzana Urbanová, Ruth K. Varner, Mark P. Waldrop, Meng Wang, Zheng Wang, Magdalena M. Wiedermann, Shanay T. Williams, Joseph B. Yavitt, Zhi-Guo Yu. 2024. Global Patterns of Metal and Other Element Enrichment in Bog and Fen Peatlands
Paul Benalcazar, Brent Seuradge, Amanda C. Diochon, Randy Kolka, Lori A. Phillips. 2024. Conversion of boreal forests to agricultural systems: soil microbial responses along a land-conversion chronosequence
P. Benalcazar, Randy Kolka, A. C. Diochon, R. R. Schindelbeck, T. Sahota, B. E. McLaren, John Stanovick. 2024. Predictive soil health indicators across a boreal forest to agricultural conversion gradient
Randy Kolka, Caroline Pierce, Isabella Garrioch, Kevin Behrens, Brandy M. Toner. 2024. Review of the Influence of Climate Change on the Hydrologic Cycling and Gaseous Fluxes of Mercury in Boreal Peatlands: Implications for Restoration
Randy Kolka, Kathleen M. Quigley, J. R. Miesel, Matthew B. Dickinson, Brian R. R. Sturtevant, Christel C. Kern. 2024. Influence of barrens restoration treatments on soil carbon, nitrogen, and mercury pools and emissions
C. P. R. McCarter, Stephen D. Sebestyen, J. D. Jeremiason, E. A. Nater, Randy Kolka. 2024. Methylmercury Export From a Headwater Peatland Catchment Decreased With Cleaner Emissions Despite Opposing Effect of Climate Warming
E.J. Henning, Randy Kolka, M.J. Helmers. 2024. Infiltration within native prairie vegetative strips embedded in row crop fields across Iowa
C.A. Williams, A. Andrews, M. Brown, K.J. Davis, F. Hoffman, L. Larson, B. Poulter, G. Shrestha, E.T. Sundquist, Y. Wei, et al., Grant M. Domke, Randy Kolka, Carl C. Trettin. 2023. 2022 North American Carbon Program Science Implementation Plan, Report of the North American Carbon Program
Camille E. Defrenne, Jessica A. M. Moore, Colin Tucker, Louis J. Lamit, Evan Kane, Randy Kolka, Rodney A. Chimner, Jason K. Keller, Erik Lilleskov. 2023. Peat loss collocates with a threshold in plant–mycorrhizal associations in drained peatlands encroached by trees
Ethan D. Pawlowski, Diana L. Karwan, Randy Kolka. 2023. Assessing nutrient and sediment load reduction potential of vegetation by utilizing the nutrient tracking tool at the field and watershed scale in a Great Lakes priority watershed
Spencer W. Roth, Natalie A. Griffiths, Randy Kolka, Keith C. Oleheiser, Alyssa A. Carrell, Dawn M. Klingeman, Angela Seibert, Jeffrey P. Chanton, Paul J. Hanson, Christopher W. Schadt, Emily B. Graham. 2023. Elevated temperature alters microbial communities, but not decomposition rates, during 3 years of in situ peat decomposition
Carlos Barreto, Pedro Henrique Silva Conceição, Estevam Cipriano Araujo de Lima, Luís Carlos Stievano, Douglas Zeppelini, Randy Kolka, Paul J. Hanson, Zoë Lindo. 2023. Large-scale experimental warming reduces soil faunal biodiversity through peatland drying
Kenton L. Sena, Jerrica K. Flynn, Wendy Leuenberger, Randy Kolka, Christopher D. Barton. 2023. Long-term changes in coarse woody debris abundance in three Appalachian headwater streams with differing best management practices
Gavin McNicol, Etienne Fluet‐Chouinard, Zutao Ouyang, Sara Knox, Zhen Zhang, Tuula Aalto, Sheel Bansal, Kuang‐Yu Chang, Min Chen, Kyle Delwiche, Sarah Feron, Mathias Goeckede, Jinxun Liu, Avni Malhotra, Joe R. Melton, William Riley, Rodrigo Vargas, Kunxiaojia Yuan, Qing Ying, Qing Zhu, Pavel Alekseychik, Mika Aurela, David P. Billesbach, David I Campbell, Jiquan Chen, Housen Chu, Ankur R. Desai, Eugenie Euskirchen, Jordan Goodrich, Timothy Griffis, Manuel Helbig, Takashi Hirano, Hiroki Iwata, Gerald Jurasinski, John King, Franziska Koebsch, Randy Kolka, Ken Krauss, Annalea Lohila, Ivan Mammarella, Mats Nilson, Asko Noormets, Walter Oechel, Matthias Peichl, Torsten Sachs, Ayaka Sakabe, Christopher Schulze, Oliver Sonnentag, Ryan C. Sullivan, Eeva‐Stiina Tuittila, Masahito Ueyama, Timo Vesala, Eric Ward, Christian Wille, Guan Xhuan Wong, Donatella Zona, Lisamarie Windham‐Myers, Benjamin Poulter, Robert B. Jackson. 2023. Upscaling Wetland Methane Emissions From the FLUXNET‐CH4 Eddy Covariance Network (UpCH4 v1.0): Model Development, Network Assessment, and Budget Comparison
Fenghui Yuan, Daniel M. Ricciuto, Xiaofeng Xu, Daniel T. Roman, Erik Lilleskov, Jeffrey D. Wood, Hinsby Cadillo-Quiroz, Angela Lafuente, Jhon Rengifo, Randy Kolka, Lizardo Fachin, Craig Wayson, Kristell Hergoualc'h, Rodney A. Chimner, Alexander Frie, Timothy J. Griffis. 2023. Evaluation and improvement of the E3SM land model for simulating energy and carbon fluxes in an Amazonian peatland
E. Anu Wille, Christian F. Lenhart, Randy Kolka. 2023. Carbon dioxide emissions in relation to water table in a restored fen
Julia E. M. Stuart, Colin Tucker, Erik Lilleskov, Randy Kolka, Rodney A. Chimner, Katherine A. A. Heckman, Evan Kane. 2023. Evidence for older carbon loss with lowered water tables and changing plant functional groups in peatlands
Brittany A. Verbeke, Louis J. Lamit, Erik Lilleskov, Suzanne B. Hodgkins, Nathan Basiliko, Evan Kane, Roxane Andersen, Rebekka R. E. Artz, Juan C. Benavides, Brian W. Benscoter, Werner Borken, Luca Bragazza, Stefani M. Brandt, Suzanna L. Bräuer, Michael A. Carson, Dan Charman, Xin Chen, Beverley R. Clarkson, Alexander R. Cobb, Peter Convey, Jhon del Águila Pasquel, Andrea S. Enriquez, Howard Griffiths, Samantha P. Grover, Charles F. Harvey, Lorna I Harris, Christina Hazard, Dominic Hodgson, Alison M. Hoyt, John Hribljan, Jyrki Jauhiainen, Sari Juutinen, Klaus‐Holger Knorr, Randy Kolka, Mari Könönen, Tuula Larmola, Carmody K. McCalley, James McLaughlin, Tim R. Moore, Nadia Mykytczuk, Anna E. Normand, Virginia Rich, Nigel Roulet, Jessica Royles, Jasmine Rutherford, David S. Smith, Mette M. Svenning, Leho Tedersoo, Pham Q. Thu, Carl C. Trettin, Eeva‐Stiina Tuittila, Zuzana Urbanová, Ruth K. Varner, Meng Wang, Zheng Wang, Matt Warren, Magdalena M. Wiedermann, Shanay Williams, Joseph B. Yavitt, Zhi‐Guo Yu, Zicheng Yu, Jeffrey P. Chanton. 2022. Latitude, elevation, and mean annual temperature predict peat organic matter chemistry at a global scale
Robert Richard, Evan Kane, Dustin Bronson, Randy Kolka. 2022. Whole-Tree Harvest Effects on Macronutrients in an Oak-Dominated System after Seven Years
Shanay T. Williams, Joseph B. Yavitt, Zhi-Guo Yu, Geoff Zahn, Shaun Watmough, Spencer Gilbert-Parkes, Nathan Basiliko, Louis J. Lamit, Erik Lilleskov, Roxanne Andersen, Jhon del Aguila-Pasquel, Rebekka E. Artz, Brian W. Benscoter, Werner Borken, Luca Bragazza, Stefani M. Brandt, Suzanna L. Bräuer, Michael A. Carson, Xin Chen, Rodney A. Chimner, Bev R. Clarkson, Alexander R. Cobb, Andrea S. Enriquez, Jenny Farmer, Samantha P. Grover, Charles F. Harvey, Lorna I Harris, Christina Hazard, Alison M. Hoyt, John Hribljan, Jyrki Jauhiainen, Sari Juutinen, Evan Kane, Klaus-Holger Knorr, Randy Kolka, Mari Könönen, Anna M. Laine, Tuula Larmola, Patrick A. Levasseur, Carmody K. McCalley, Jim McLaughlin, Tim R. Moore, Nadia Mykytczuk, Anna E. Normand, Virginia Rich, Bryce Robinson, Danielle L. Rupp, Jasmine Rutherford, Christopher W. Schadt, Dave S. Smith, Graeme Spiers, Leho Tedersoo, Pham Q. Thu, Carl C. Trettin, Eeva-Stiina Tuittila, Merritt Turetsky, Zuzana Urbanová, Ruth K. Varner, Mark P. Waldrop, Meng Wang, Zheng Wang, Matt Warren, Magdalena M. Wiedermann. 2022. Variation in carbon and nitrogen concentrations among peatland categories at the global scale
Colin P. R. McCarter, Stephen D. Sebestyen, Jill K. Coleman Wasik, Daniel R. Engstrom, Randy Kolka, Jeff D. Jeremiason, Edward B. Swain, Bruce A. Monson, Brian A. Branfireun, Steven J. Balogh, Edward A. Nater, Sue Eggert, Paris Ning, Carl P. J. Mitchell. 2022. Long-Term Experimental Manipulation of Atmospheric Sulfate Deposition to a Peatland: Response of Methylmercury and Related Solute Export in Streamwater
P. Benalcazar, A.C. Diochon, Randy Kolka, R.R. Schindelbeck, T. Sahota, B.E. McLaren. 2022. The impact of land conversion from boreal forest to agriculture on soil health indicators
T. Hirano, E. R. Humphreys, G. Kiely, Randy Kolka, T. Laurila, P. G. Leahy, A. Lohila, I. Mammarella, M. B. Nilsson, A. Panov, F. J. W. Parmentier, M. Peichl, J. Rinne, Daniel Tyler Roman, O. Sonnentag, E.-S Tuittila, M. Ueyama, T. Vesala, P. Vestin, S. Weldon, P. Weslien, S. Zaehle, M. Helbig, T. Živković, P. Alekseychik, M. Aurela, T. S. El-Madany, E. S. Euskirchen, L. B. Flanagan, T. J. Griffis, P. J. Hanson, J. Hattakka, C. Helfter. 2022. Warming response of peatland CO₂ sink is sensitive to seasonality in warming trends
Anna B. Stockstad, Robert A. Slesak, Alan J. Toczydlowski, Charles R. Blinn, Randy Kolka, Stephen D. Sebestyen. 2022. The effects of combined throughfall reduction and snow removal on soil physical properties across a drainage gradient in aspen forests of northern Minnesota, USA
Anna B. Stockstad, Robert A. Slesak, Alan J. Toczydlowski, Charles R. Blinn, Randy Kolka, Stephen D. Sebestyen. 2022. Limited effects of precipitation manipulation on soil respiration and inorganic N concentrations across soil drainage classes in northern Minnesota aspen forests
Joseph Shannon, Randy Kolka, Matthew Van Grinsven, Fengjing Liu. 2022. Joint impacts of future climate conditions and invasive species on black ash forested wetlands
Hesti L. Tata, Hani S. Nuroniah, Diandra A. Ahsania, Haning Anggunira, Siti N. Hidayati, Meydina Pratama, Istomo Istomo, Rodney A. Chimner, Meine van Noordwijk, Randy Kolka. 2022. Flooding tolerance of four tropical peatland tree species in a nursery trial
Colin P. R. McCarter, Sue Eggert, Stephen D. Sebestyen, Randy Kolka, Carl P. J. Mitchell. 2022. Effects of Clearcutting and Residual Biomass Harvesting on Hillslope Mercury Mobilization and Downgradient Mercury Accumulation
Randy Kolka, Robert G. Haight, Chan Lan Chun, Matthew J. Berens, Elizabeth Rogers, Ryan Vinhal, Ronald S. Zalesny Jr., Keith Nislow, Charles H. (Hobie) Perry, Stephanie Connolly. 2022. Mercury sulfur initiative: suggested program of research for the Upper Great Lakes States
Kathryn L. Hofmeister, Sue Eggert, Brian J. J. Palik, David Morley, Emily Creighton, Marty Rye, Randy Kolka. 2022. The Identification, Mapping, and Management of Seasonal Ponds in Forests of the Great Lakes Region
Caroline E. Pierce, Olha S. Furman, Sarah L. Nicholas, Jill Coleman Wasik, Caitlin M. Gionfriddo, Ann M. Wymore, Stephen D. Sebestyen, Randy Kolka, Carl P. J. Mitchell, Natalie A. Griffiths, Dwayne A. Elias, Edward A. Nater, Brandy M. Toner. 2022. Role of Ester Sulfate and Organic Disulfide in Mercury Methylation in Peatland Soils
Joseph Shannon, Fengjing Liu, Matthew Van Grinsven, Randy Kolka, Thomas Pypker. 2022. Magnitude, consequences and correction of temperature‐derived errors for absolute pressure transducers under common monitoring scenarios
Sarah J. Shelley, Deanne J. Brice, Colleen M. Iversen, Randy Kolka, Stephen D. Sebestyen, Natalie A. Griffiths. 2022. Deciphering the shifting role of intrinsic and extrinsic drivers on moss decomposition in peatlands over a 5‐year period
Randy Kolka, Carl C. Trettin, Lisamarie Windham-Myers. 2022. The importance of wetland carbon dynamics to society: insight from the second state of the carbon cycle science report
Robert P. Richard, Evan Kane, Dustin Bronson, Ann L. Maclean, Randy Kolka. 2021. Plant communities and landform relationships delineate the components of soil complexes subject to whole‐tree harvest restriction
Sue Eggert, Steven A. Heiskary, Randy Kolka, Brian H. Hill, Bruce A. Monson, Edward B. Swain. 2021. Chapter 2: Ecoregion 5.2.1 Northern lakes and forests: Marcell Experimental Forest, Minnesota
Rachel M. Wilson, Natalie A. Griffiths, Ate Visser, Karis J. McFarlane, Stephen D. Sebestyen, Keith C. Oleheiser, Samantha Bosman, Anya M. Hopple, Malak M. Tfaily, Randy Kolka, Paul J. Hanson, Joel E. Kostka, Scott D. Bridgham, Jason K. Keller, Jeffrey P. Chanton. 2021. Radiocarbon Analyses Quantify Peat Carbon Losses With Increasing Temperature in a Whole Ecosystem Warming Experiment
Robert P. Richard, Evan Kane, Dustin Bronson, Randy Kolka. 2021. Long-Term Ecosystem Nutrient Pool Status for Aspen Forest Harvest Simulations on Glacial Till and Sandy Outwash Soils
Louis J. Lamit, Karl J. Romanowicz, Lynette Potvin, Jay T. Lennon, Susannah G. Tringe, Rodney A. Chimner, Randy Kolka, Evan Kane, Erik Lilleskov. 2021. Peatland microbial community responses to plant functional group and drought are depth‐dependent
François Maillard, Christopher W. Fernandez, Sunil Mundra, Katherine A. A. Heckman, Randy Kolka, Håvard Kauserud, Peter G. Kennedy. 2021. Warming drives a 'hummockification' of microbial communities associated with decomposing mycorrhizal fungal necromass in peatlands
Sergio Miguel López-Ramírez, Alex Mayer, Leonardo Sáenz, Lyssette Elena Muñoz-Villers, Friso Holwerda, Nathaniel Looker, Christoph Schürz, Z. Carter Berry, Robert Manson, Heidi Asbjornsen, Randy Kolka, Daniel Geissert, Carlos Lezama. 2021. A comprehensive calibration and validation of SWAT-T using local datasets, evapotranspiration and streamflow in a tropical montane cloud forest area with permeable substrate in central Veracruz, Mexico
Daniel M. Ricciuto, Xiaofeng Xu, Xiaoying Shi, Yihui Wang, Xia Song, Christopher W. Schadt, Natalie A. Griffiths, Jiafu Mao, Jeffrey M. Warren, Peter E. Thornton, Jeff Chanton, Jason K. Keller, Scott D. Bridgham, Jessica Gutknecht, Stephen D. Sebestyen, Adrien Finzi, Randy Kolka, Paul J. Hanson. 2021. An Integrative Model for Soil Biogeochemistry and Methane Processes: I. Model Structure and Sensitivity Analysis
Verity G. Salmon, Deanne J. Brice, Scott Bridgham, Joanne Childs, Jake Graham, Natalie A. Griffiths, Kirsten Hofmockel, Colleen M. Iversen, Terri M. Jicha, Randy Kolka, Joel E. Kostka, Avni Malhotra, Richard J. Norby, Jana R. Phillips, Daniel Ricciuto, Christopher W. Schadt, Stephen D. Sebestyen, Xiaoying Shi, Anthony P. Walker, Jeffrey Warren, David J. Weston, Xiaojuan Yang, Paul J. Hanson. 2021. Nitrogen and phosphorus cycling in an ombrotrophic peatland: a benchmark for assessing change
Liam Krause, Kevin McCullough, Evan Kane, Randy Kolka, Rodney A. Chimner, Erik Lilleskov. 2021. Impacts of historical ditching on peat volume and carbon in northern Minnesota USA peatlands
Rachel M. Wilson, Malak M. Tfaily, Max Kolton, Eric R. Johnston, Caitlin Petro, Cassandra A. Zalman, Paul J. Hanson, Heino M. Heyman, Jennifer E. Kyle, David W. Hoyt, Elizabeth K. Eder, Samuel O. Purvine, Randy Kolka, Stephen D. Sebestyen, Natalie A. Griffiths, Christopher W. Schadt, Jason K. Keller, Scott D. Bridgham, Jeffrey P. Chanton, Joel E. Kostka. 2021. Soil metabolome response to whole-ecosystem warming at the Spruce and Peatland Responses under Changing Environments experiment
Anna Stockstad, Ella Gray, Stephen D. Sebestyen, Nina Lany, Randy Kolka, Marcella Windmuller-Campione. 2021. Analyzing Trends in Water Table Elevations at the Marcell Experimental Forest, Minnesota, U.S.A.
Colin P. R. McCarter, Stephen D. Sebestyen, Susan L. Eggert, Randy Kolka, Carl P. J. Mitchell. 2021. Differential subsurface mobilization of ambient mercury and isotopically enriched mercury tracers in a harvested and residue harvested hardwood forest in northern Minnesota
Stephen D. Sebestyen, Nina Lany, Daniel Tyler Roman, Jacob Burdick, Richard L. Kyllander, Elon Sandy Verry, Randy Kolka. 2021. Hydrological and meteorological data from research catchments at the Marcell Experimental Forest, Minnesota, USA
Hannah C. Friesen, Robert A. Slesak, Diana L. Karwan, Randy Kolka. 2021. Effects of snow and climate on soil temperature and frost development in forested peatlands in Minnesota, USA
Xueying Yu, Dylan B. Millet, Kelley C. Wells, Daven K. Henze, Hansen Cao, Timothy J. Griffis, Eric A. Kort, Genevieve Plant, Malte J. Deventer, Randy Kolka, Daniel Tyler Roman, Kenneth J. Davis, Ankur R. Desai, Bianca C. Baier, Kathryn McKain, Alan C. Czarnetzki, A. Anthony. Bloom. 2021. Aircraft-based inversions quantify the importance of wetlands and livestock for Upper Midwest methane emissions
Kathleen M. Quigley, Randy Kolka, Brian R. R. Sturtevant, Matthew B. Dickinson, Christel C. Kern, Jessica R. Miesel. 2021. Restoring open canopy pine barrens from the ground up: Repeated burns correspond with increased soil hydraulic conductivity
M Julian Deventer, Daniel Tyler Roman, Ivan Bogoev, Randy Kolka, Matt Erickson, Xuhui Lee, John M. Baker, Dylan B. Millet, Timothy J. Griffis. 2021. Biases in open-path carbon dioxide flux measurements: Roles of instrument surface heat exchange and analyzer temperature sensitivity
Mara McPartland, Rebecca Montgomery, Paul Hanson, Jana Phillips, Randy Kolka, Brian Palik. 2020. Vascular plant species response to warming and elevated carbon dioxide in a boreal peatland
Carl C. Trettin, Randy Kolka, Anne S. Marsh, Sheel Bansal, Erik Lilleskov, Patrick Megonigal, Marla J. Stelk, Graeme Lockaby, David V. D'Amore, Richard A. MacKenzie, Brian Tangen, Rodney Chimner, James Gries. 2020. Wetland and hydric soils
Colin P. R. McCarter, Stephen D. Sebestyen, Sue Eggert, Randy Kolka, Carl P. J. Mitchell. 2020. Changes in hillslope hydrology in a perched, shallow soil system due to clearcutting and residual biomass removal
T.J. Griffis, Daniel Tyler Roman, J.D. Wood, J. Deventer, L. Fachin, J. Rengifo, D. Del Castillo, Erik Lilleskov, Randy Kolka, R.A. Chimner, J. del Aguila-Pasquel, C. Wayson, K. Hergoualc'h, J.M. Baker, H. Cadillo-Quiroz, D.M. Ricciuto. 2020. Hydrometeorological sensitivities of net ecosystem carbon dioxide and methane exchange of an Amazonian palm swamp peatland
Z. Carter Berry, Kelly W. Jones, Leon Rodrigo Gomez Aguilar, Russell G. Congalton, Friso Holwerda, Randy Kolka, Nathaniel Looker, Sergio Miguel Lopez Ramirez, Robert Manson, Alex Mayer, Lyssette Muñoz-Villers, Perla Ortiz Colin, Humberto Romero-Uribe, Leonardo Saenz, Juan Jose Von Thaden, Mariana Quetzalli Vizcaíno Bravo, Guadalupe Williams-Linera, Heidi Asbjornsen. 2020. Evaluating ecosystem service trade-offs along a land-use intensification gradient in central Veracruz, Mexico
Xue Feng, M. Julian Deventer, Rachel Lonchar, G. H. Crystal Ng, Stephen D. Sebestyen, Daniel Tyler Roman, Timothy J. Griffis, Dylan B. Millet, Randy Kolka. 2020. Climate Sensitivity of Peatland Methane Emissions Mediated by Seasonal Hydrologic Dynamics
Emily A. Altrichter, Catherine M. Mabry, Janette R. Thompson, Randy Kolka. 2020. Genetic Differentiation and Phenotypic Plasticity of Forest Herbaceous Species in Iowa, Central United States
Robert A. Slesak, Randy Kolka, Rodney T. Venterea, Anthony W. D'Amato, Brian J. J. Palik, Alan J.Z. Toczydlowski. 2020. Effect of simulated emerald ash borer infestation on nitrogen cycling in black ash (Fraxinus nigra) wetlands in northern Minnesota, USA
Paul J. Hanson, Natalie A. Griffiths, Colleen M. Iversen, Richard J. Norby, Stephen D. Sebestyen, Jana R. Phillips, Jeffrey P. Chanton, Randy Kolka, Avni Malhotra, Keith C. Oleheiser, Jeffrey M. Warren, Xiaoying Shi, Xiaojuan Yang, Jiafu Mao, Daniel M. Ricciuto. 2020. Rapid Net Carbon Loss From a Whole‐Ecosystem Warmed Peatland
Kathleen M. Quigley, Randy Kolka, Brian R. R. Sturtevant, Matthew B. Dickinson, Christel C. Kern, Deahn Donner, Jessica R. Miesel. 2020. Prescribed burn frequency, vegetation cover, and management legacies influence soil fertility: Implications for restoration of imperiled pine barrens habitat
Alan J.Z. Toczydlowski, Robert A. Slesak, Randy Kolka, Rodney T. Venterea. 2020. Temperature and water-level effects on greenhouse gas fluxes from black ash (Fraxinus nigra) wetland soils in the Upper Great Lakes region, USA
Jennie I Sirota, Randy Kolka, Stephen D. Sebestyen, Edward A. Nater. 2020. Mercury dynamics in the pore water of peat columns during experimental freezing and thawing
Evan Kane, T. J. Veverica, M. M. Tfaily, Erik Lilleskov, K. M. Meingast, Randy Kolka, A. L. Daniels, R. A. Chimner. 2019. Reduction‐Oxidation Potential and Dissolved Organic Matter Composition in Northern Peat Soil: Interactive Controls of Water Table Position and Plant Functional Groups
Joshua C. Davis, Joseph P. Shannon, Matthew J. Van Grinsven, Nicholas W. Bolton, Joseph Wagenbrenner, Randy Kolka, Thomas G. Pypker. 2019. Nitrogen cycling responses to simulated emerald ash borer infestation in Fraxinus nigra-dominated wetlands
Mikayla J. Boche, Thomas M. DeSutter, Randy Kolka. 2019. Factors Affecting Soil Total Mercury in Seasonal Pond Basins within a Northern Hardwood Forest in Minnesota, USA
Tera E. Lewandowski, Jodi A. Forrester, David J. Mladenoff, Erika Marin-Spiotta, Anthony W. D'Amato, Brian J. J. Palik, Randy Kolka. 2019. Long term effects of intensive biomass harvesting and compaction on the forest soil ecosystem
M. Julian Deventer, Timothy J. Griffis, Daniel Tyler Roman, Randy Kolka, Jeffrey D. Wood, Matt Erickson, John M. Baker, Dylan B. Millet. 2019. Error characterization of methane fluxes and budgets derived from a long-term comparison of open- and closed-path eddy covariance systems
S.F. Dymond, A.W. D'Amato, Randy Kolka, P.V. Bolstad, Stephen D. Sebestyen, K. Gill, M.T. Curzon. 2019. Climatic controls on peatland black spruce growth in relation to water table variation and precipitation
Mara McPartland, Michael Falkowski, Jason Reinhardt, Evan Kane, Randy Kolka, Merritt Turetsky, Thomas Douglas, John Anderson, Jarrod Edwards, Brian Palik, Rebecca Montgomery. 2019. Characterizing Boreal Peatland Plant Composition and Species Diversity with Hyperspectral Remote Sensing
Kristine M. Haynes, Evan Kane, Lynette Potvin, Erik Lilleskov, Randy Kolka, Carl P.J. Mitchell. 2019. Impacts of experimental alteration of water table regime and vascular plant community composition on peat mercury profiles and methylmercury production
Erin C. Pischke, Z. Carter Berry, Randy Kolka, Jacob Salcone, Diana Córdoba, Xoco Shinbrot, Sergio Miguel López Ramirez, Kelly W. Jones, Russell G. Congalton, Robert H. Manson, Juan José Von Thaden Ugalde, Theresa Selfa, V. Sophie Avila Foucat, Heidi Asbjornsen. 2019. Lessons learned about collaborating across coupled human-natural systems research on Mexico's Payments for Hydrological Services Program
Kathleen M. Quigley, R.E. Wildt, Brian R. R. Sturtevant, Randy Kolka, Matthew B. Dickinson, Christel C. Kern, Deahn Donner, J.R. Miesel. 2019. Fuels, vegetation, and prescribed fire dynamics influence ash production and characteristics in a diverse landscape under active pine barrens restoration
Daniel Murdiyarso, Erik Lilleskov, Randy Kolka. 2019. Tropical peatlands under siege: the need for evidence-based policies and strategies
Christopher W. Fernandez, Katherine A. A. Heckman, Randy Kolka, Peter G. Kennedy. 2019. Melanin mitigates the accelerated decay of mycorrhizal necromass with peatland warming
Mara Y. McPartland, Evan Kane, Michael J. Falkowski, Randy Kolka, Merritt R. Turetsky, Brian J. J. Palik, Rebecca A. Montgomery. 2019. The response of boreal peatland community composition and NDVI to hydrologic change, warming and elevated carbon dioxide
Nam Jin Noh, Joseph P. Shannon, Nicholas W. Bolton, Joshua C. Davis, Matthew J. Van Grinsven, Thomas G. Pypker, Randy Kolka, Joseph Wagenbrenner. 2019. Temperature responses of carbon dioxide fluxes from coarse dead wood in a black ash wetland
Randy Kolka, Charlotte E. Riggs, Edward A. Nater, Trent R. Wickman, Emma L. Witt, Jason T. Butcher. 2019. Temporal fluctuations in young-of-the-year yellow perch mercury bioaccumulation in lakes of northeastern Minnesota
Erik Lilleskov, Kevin McCullough, Kristell Hergoualc’h, Dennis del Castillo Torres, Rodney Chimner, Daniel Murdiyarso, Randy Kolka, Laura Bourgeau-Chavez, John Hribljan, Jhon del Aguila Pasquel, Craig Wayson. 2019. Is Indonesian peatland loss a cautionary tale for Peru? A two-country comparison of the magnitude and causes of tropical peatland degradation
Randy Kolka, Carl C. Trettin, Wenwu Tang, Ken W. Krauss, Sheel Bansal, Judith Z. Drexler, Kimberly P. Wickland, Rodney A. Chimner, Dianna M. Hogan, Emily J. Pindilli, Brian Benscoter, Brian A. Tangen, Evan Kane, Scott Bridgham, Curtis J. Richardson. 2018. Terrestrial wetlands
Brittni L. Bertolet, Jessica R. Corman, Nora J. Casson, Stephen D. Sebestyen, Randy Kolka, Emily H. Stanley. 2018. Influence of soil temperature and moisture on the dissolved carbon, nitrogen, and phosphorus in organic matter entering lake ecosystems
Jessica R. Miesel, Randy Kolka, Phil Townsend. 2018. Chapter 10 - Wildfire and fire severity effects on post-fire carbon and nitrogen cycling in forest soil (Project NC-EM-F-14-1)
Matthew Van Grinsven, Joseph Shannon, Nicholas Bolton, Joshua Davis, Nam Noh, Joseph Wagenbrenner, Randy Kolka, Thomas Pypker. 2018. Response of black ash wetland gaseous soil carbon fluxes to a simulated emerald ash borer infestation
J. R. Corman, B. L. Bertolet, N. J. Casson, Stephen D. Sebestyen, Randy Kolka, E. H. Stanley. 2018. Nitrogen and Phosphorus Loads to Temperate Seepage Lakes Associated With Allochthonous Dissolved Organic Carbon Loads
Joseph Shannon, Matthew Van Grinsven, Joshua Davis, Nicholas Bolton, Nam Noh, Thomas Pypker, Randy Kolka. 2018. Water Level Controls on Sap Flux of Canopy Species in Black Ash Wetlands
Nicholas Bolton, Joseph Shannon, Joshua Davis, Matthew Grinsven, Nam Noh, Shon Schooler, Randy Kolka, Thomas Pypker, Joseph Wagenbrenner. 2018. Methods to Improve Survival and Growth of Planted Alternative Species Seedlings in Black Ash Ecosystems Threatened by Emerald Ash Borer
Randy Kolka, Anthony W. D'Amato, Joseph Wagenbrenner, Robert A. Slesak, Thomas G. Pypker, Melissa B. Youngquist, Alexis R. Grinde, Brian J. J. Palik. 2018. Review of ecosystem level impacts of emerald ash borer on black ash wetlands: What does the future hold?
Zichong Chen, Timothy J. Griffis, John M. Baker, Dylan B. Millet, Jeffrey D. Wood, Edward J. Dlugokencky, Arlyn E. Andrews, Colm Sweeney, Cheng Hu, Randy Kolka. 2018. Source partitioning of methane emissions and its seasonality in the U.S. Midwest
Glenn E. Woerndle, Martin Tsz-Ki Tsui, Stephen D. Sebestyen, Joel D. Blum, Xiangping Nie, Randy Kolka. 2018. New Insights on Ecosystem Mercury Cycling Revealed by Stable Isotopes of Mercury in Water Flowing from a Headwater Peatland Catchment
Colleen M. Iversen, Joanne Childs, Richard J. Norby, Todd A. Ontl, Randy Kolka, Deanne J. Brice, Karis J. McFarlane, Paul J. Hanson. 2018. Fine-root growth in a forested bog is seasonally dynamic, but shallowly distributed in nutrient-poor peat
Matthew Powers, Randy Kolka, John Bradford, Brian J. J. Palik, Martin Jurgensen. 2017. Forest floor and mineral soil respiration rates in a northern Minnesota red pine chronosequence
Lisa A. Schulte, Jarad Niemi, Matthew J. Helmers, Matt Liebman, J. Gordon Arbuckle, David E. James, Randy Kolka, Matthew E. O’Neal, Mark D. Tomer, John C. Tyndall, Heidi Asbjornsen, Pauline Drobney, Jeri Neal, Gary Van Ryswyk, Chris Witte. 2017. Prairie strips improve biodiversity and the delivery of multiple ecosystem services from corn–soybean croplands
Salli Dymond, John B. Bradford, Paul V. Bolstad, Randy Kolka, Stephen D. Sebestyen, Thomas M. DeSutter. 2017. Topographic, edaphic, and vegetative controls on plant-available water
Matthew Warren, Kristell Hergoualc'h, J. Boone Kauffman, Daniel Murdiyarso, Randy Kolka. 2017. An appraisal of Indonesia's immense peat carbon stock using national peatland maps: uncertainties and potential losses from conversion
Joshua C. Davis, Joseph P. Shannon, Nicholas W. Bolton, Randy Kolka, Thomas G. Pypker. 2017. Vegetation responses to simulated emerald ash borer infestation in Fraxinus nigra dominated wetlands of Upper Michigan, USA
Trevor Hobbs, Jason Lynch, Randy Kolka. 2017. Site-specific critical acid load estimates for forest soils in the Osborn Creek watershed, Michigan
J. C. Olson, A. M. Marcarelli, Anne Timm, Sue Eggert, Randy Kolka. 2017. Evaluating the Effects of Culvert Designs on Ecosystem Processes in Northern Wisconsin Streams
Matthew J. Van Grinsven, Joseph P. Shannon, Joshua C. Davis, Nicholas W. Bolton, Joseph Wagenbrenner, Randy Kolka, Thomas Grant Pypker. 2017. Source water contributions and hydrologic responses to simulated emerald ash borer infestations in depressional black ash wetlands
Charlotte E. Riggs, Randy Kolka, Edward A. Nater, Emma L. Witt, Trent R. Wickman, Laurel G. Woodruff, Jason T. Butcher. 2017. Yellow perch (Perca flavescens) mercury unaffected by wildland fires in northern Minnesota
Anne Timm, D. Higgins, John Stanovick, Randy Kolka, Sue Eggert. 2017. Quantifying fish habitat associated with stream simulation design culverts in northern Wisconsin
Usman Anwar, Lisa Schulte, Matthew Helmers, Randy Kolka. 2017. The Effect of Five Biomass Cropping Systems on Soil-Saturated Hydraulic Conductivity Across a Topographic Gradient
Randy Kolka, Brian R. R. Sturtevant, Jessica R. Miesel, Aditya Singh, Peter T. Wolter, Shawn Fraver, Thomas M. DeSutter, Phil A. Townsend. 2017. Emissions of forest floor and mineral soil carbon, nitrogen and mercury pools and relationships with fire severity for the Pagami Creek Fire in the Boreal Forest of northern Minnesota
Xavier Comas, Neil Terry, John A. Hribljan, Erik Lilleskov, Esteban Suarez, Rodney A. Chimner, Randy Kolka. 2017. Estimating belowground carbon stocks in peatlands of the Ecuadorian páramo using ground-penetrating radar (GPR)
Kristine M. Haynes, Evan Kane, Lynette Potvin, Erik Lilleskov, Randy Kolka, Carl P. J. Mitchell. 2017. Mobility and transport of mercury and methylmercury in peat as a function of changes in water table regime and plant functional groups
Kristine M. Haynes, Evan Kane, Lynette Potvin, Erik Lilleskov, Randy Kolka, Carl P.J. Mitchell. 2017. Gaseous mercury fluxes in peatlands and the potential influence of climate change
Michaeleen Gerken Golay, Janette Thompson, Randy Kolka, Kris Verheyen. 2016. Carbon, nitrogen and phosphorus storage across a growing season by the herbaceous layer in urban and preserved temperate hardwood forests
Joshua J. Puhlick, Aaron R. Weiskittel, Ivan J. Fernandez, Shawn Fraver, Laura S. Kenefic, Robert S. Seymour, Randy Kolka, Lindsey Rustad, John Brissette. 2016. Long-term influence of alternative forest management treatments on total ecosystem and wood product carbon storage
R. M. Wilson, A. M. Hopple, M. M. Tfaily, Stephen D. Sebestyen, C. W. Schadt, L. Pfeifer-Meister, C. Medvedeff, K. J. McFarlane, J. E. Kostka, M. Kolton, Randy Kolka, L. A. Kluber, J. K. Keller, T. P. Guilderson, N. A. Griffiths, J. P. Chanton, S. D. Bridgham, P. J. Hanson. 2016. Stability of peatland carbon to rising temperatures
S.F. Dymond, A.W. D'Amato, Randy Kolka, P.V. Bolstad, Stephen D. Sebestyen, J.B. Bradford. 2016. Growth-climate relationships across topographic gradients in the northern Great Lakes
P. J. Hanson, A. L. Gill, X. Xu, J. R. Phillips, D. J. Weston, Randy Kolka, J. S. Riggs, L. A. Hook. 2016. Intermediate-scale community-level flux of CO₂ and CH₄ in a Minnesota peatland: putting the SPRUCE project in a global context
Dong-Gill Kim, Habitamu Taddese, Abrham Belay, Randy Kolka. 2016. The impact of traditional fire management on soil carbon and nitrogen pools in a montane forest, southern Ethiopia
Joshua Adkins, Christopher Barton, Scott Grubbs, Jeffrey Stringer, Randy Kolka. 2016. Assessment of streamside management zones for conserving benthic macroinvertebrate communities following timber harvest in eastern Kentucky headwater catchments
Sona Psarska, Edward A. Nater, Randy Kolka. 2016. Impacts of invasive earthworms on soil mercury cycling: Two mass balance approaches to an earthworm invasion in a northern Minnesota forest
Randy Kolka, D. Murdiyarso, J. B. Kauffman, Richard Birdsey. 2016. Tropical wetlands, climate, and land-use change: adaptation and mitigation opportunities
Stephen D. Sebestyen, Randy Kolka. 2016. Thirty-year results from a paired-catchment study of upland flowpath responses to forest cover conversion in northern Minnesota
Randy Kolka, Carl Mitchell, Ed Nater. 2016. Watershed cycling of mercury and controls on methylmercury production in Northern Minnesota landscapes
Anne Timm, Eric Hallerman, Andy Dolloff, Mark Hudy, Randy Kolka. 2016. Identification of a barrier height threshold where brook trout population genetic diversity, differentiation, and relatedness are affected
Brian H. Hill, Terri M. Jicha, LaRae L.P. Lehto, Colleen M. Elonen, Stephen D. Sebestyen, Randy Kolka. 2016. Comparisons of soil nitrogen mass balances for an ombrotrophic bog and a minerotrophic fen in northern Minnesota
Joshua J. Puhlick, Shawn Fraver, Ivan J. Fernandez, Aaron R. Weiskittel, Laura S. Kenefic, Randy Kolka, Marie-Cecile Gruselle. 2016. Factors influencing organic-horizon carbon pools in mixed-species stands of central Maine, USA
Emma L. Witt, Christopher D. Barton, Jeffrey W. Stringer, Randy Kolka, Mac A. Cherry. 2016. Influence of Variable Streamside Management Zone Configurations on Water Quality after Forest Harvest
Randy Kolka, Scott D. Bridgham, Chien-Lu Ping. 2016. Soils of peatlands: histosols and gelisols
Jessica R. Miesel, Randy Kolka, Philip A. Townsend, William C. Hockaday. 2015. Fire severity effects on soil organic matter in northern Minnesota, USA
Karl J. Romanowicz, Evan Kane, Lynette Potvin, Aleta L. Daniels, Randy Kolka, Erik Lilleskov. 2015. Understanding drivers of peatland extracellular enzyme activity in the PEATcosm experiment: mixed evidence for enzymic latch hypothesis
Jessica R. Miesel, William C. Hockaday, Randy Kolka, Philip A. Townsend. 2015. Soil organic matter composition and quality across fire severity gradients in coniferous and deciduous forests of the southern boreal region
Jiayu Wu, Timothy W. Stewart, Janette R. Thompson, Randy Kolka, Kristie J. Franz. 2015. Watershed features and stream water quality: Gaining insight through path analysis in a Midwest urban landscape, USA
Chad Babcock, Andrew O. Finley, John B. Bradford, Randy Kolka, Richard Birdsey, Michael G. Ryan. 2015. LiDAR based prediction of forest biomass using hierarchical models with spatially varying coefficients
J.K. Coleman Wasik, D.R. Engstrom, C.P.J. Mitchell, E.B. Swain, B.A. Monson, S.J. Balogh, J.D. Jeremiason, B.A. Branfireun, Randy Kolka, J.E. Almendinger. 2015. The effects of hydrologic fluctuation and sulfate regeneration on mercury cycling in an experimental peatland
Terje Kristensen, Erik Naesset, Mikael Ohlson, Paul V. Bolstad, Randy Kolka. 2015. Mapping above- and below-ground carbon pools in boreal forests: The case for airborne lidar
Heidi Asbjornsen, Alex S. Mayer, Kelly W. Jones, Theresa Selfa, Leonardo Saenz, Randy Kolka, Kathleen E. Halvorsen. 2015. Assessing impacts of payments for watershed services on sustainability in coupled human and natural systems
Todd A. Ontl, Cynthia A. Cambardella, Lisa Schulte, Randy Kolka. 2015. Factors influencing soil aggregation and particulate organic matter responses to bioenergy crops across a topographic gradient
X. Comas, N. Terry, Matthew W. Warren, Randy Kolka, A. Kristiyono, N. Sudiana, D. Nurjaman, T. Darusman. 2015. Imaging tropical peatlands in Indonesia using ground-penetrating radar (GPR) and electrical resistivity imaging (ERI): implications for carbon stock estimates and peat soil characterization
D.S. Ross, Scott Bailey, R.D. Briggs, J. Curry, I.J. Fernandez, G. Fredriksen, C.L. Goodale, P.W. Hazlett, P.R. Heine, C.E. Johnson, John T. Larson, G.B. Lawrence, Randy Kolka, R. Ouimet, D. Pare, D. deB Richter, C.D. Schirmer, R.A. Warby. 2015. Inter-laboratory variation in the chemical analysis of acidic forest soil reference samples from eastern North America
Lynette Potvin, Evan S. Kane, Rodney A. Chimner, Randy Kolka, Erik Lilleskov. 2015. Effects of water table position and plant functional group on plant community, aboveground production, and peat properties in a peatland mesocosm experiment (PEATcosm)
Brian J. J. Palik, Brooke K. Haworth, Andrew J. David, Randy Kolka. 2015. Survival and growth of northern white-cedar and balsam fir seedlings in riparian management zones in northern Minnesota, USA
Ankur R. Desai, Ke Xu, Hanqin Tian, Peter Weishampel, Jonathan Thom, Dan Baumann, Arlyn E. Andrews, Druce D. Cook, Jennifer Y. King, Randy Kolka. 2015. Landscape-level terrestrial methane flux observed from a very tall tower
C. Rhett Jackson, James A. Thompson, Randy Kolka. 2014. Wetland soils, hydrology and geomorphology
L.R. Seifert-Monson, B.H. Hill, Randy Kolka, T.M. Jicha, L.L. Lehto, C.M. Elonen. 2014. Effects of sulfate deposition on pore water dissolved organic carbon, nutrients, and microbial enzyme activities in a northern peatland
Rodney A. Chimner, Cassandra A. Ott, Charles H. (Hobie) Perry, Randy Kolka. 2014. Developing and evaluating rapid field methods to estimate peat carbon
Salli Dymond, Randy Kolka, Paul V. Bolstad, Stephen D. Sebestyen. 2014. Long-term soil moisture patterns in a northern Minnesota forest
Marlín Pérez-Suárez, Michael J. Castellano, Randy Kolka, Heidi Asbjornsen, Matthew Helmers. 2014. Nitrogen and carbon dynamics in prairie vegetation strips across topographical gradients in mixed Central Iowa agroecosystems
James Vose, Wayne T. Swank, Mary Beth Adams, Devendra M. Amatya, John Campbell, Sherri Johnson, Frederick J. Swanson, Randy Kolka, Ariel Lugo, Robert C. Musselman, Charles Rhoades. 2014. The role of experimental forests and ranges in the development of ecosystem science and biogeochemical cycling research
Shannon B. Hagerty, Kees Jan van Groenigen, Steven D. Allison, Bruce A. Hungate, Egbert Schwartz, George W. Koch, Randy Kolka, Paul Dijkstra. 2014. Accelerated microbial turnover but constant growth efficiency with warming in soil
Tomorra E. Smith, Randy Kolka, Xiaobo Zhou, Matthew J. Helmers, Richard M. Cruse, Mark D. Tomer. 2014. Effects of native perennial vegetation buffer strips on dissolved organic carbon in surface runoff from an agricultural landscape
X. Zhou, M.J. Helmers, H. Asbjornsen, Randy Kolka, M.D. Tomer, R.M. Cruse. 2014. Nutrient removal by prairie filter strips in agricultural landscapes
Randy Kolka, Brian R. R. Sturtevant, Philip Townsend, Jessica Miesel, Peter Wolter, Shawn Fraver, Tom DeSutter. 2014. Post-fire comparisons of forest floor and soil carbon, nitrogen, and mercury pools with fire severity indices
Gerald J. Gottfried, Peter F. Ffolliott, Kenneth N. Brooks, Randy Kolka, Carol B. Raish, Dan G. Neary. 2014. Contributions of studies on experimental forests to hydrology and watershed management [Chapter 14]
M. Mazur, C.P.J. Mitchell, C.S. Eckley, Sue Eggert, Randy Kolka, Stephen D. Sebestyen, E.B. Swain. 2014. Gaseous mercury fluxes from forest soils in response to forest harvesting intensity: A field manipulation experiment
Brian H. Hill, Colleen M. Elonen, Terri M. Jicha, Randy Kolka, LaRae L.P. Lehto, Stephen D. Sebestyen, Lindsey R. Seifert-Monson. 2014. Ecoenzymatic stoichiometry and microbial processing of organic matter in northern bogs and fens reveals a common P-limitation between peatland types
Douglas Kastendick, Brian J. J. Palik, Eric K. Zenner, Randy Kolka, Charles R. Blinn, Joshua Kragthorpe. 2014. Regeneration responses in partially-harvested riparian management zones in northern Minnesota
Stephen Handler, Matthew Duveneck, Louis Iverson, Emily Peters, Robert M. Scheller, Kirk R. Wythers, Leslie Brandt, Patricia Butler, Maria Janowiak, P. Danielle Shannon, Chris Swanston, Kelly Barrett, Randy Kolka, Casey McQuiston, Brian J. J. Palik, Peter B. Reich, Clarence Turner, Mark White, Cheryl Adams, Anthony D'Amato, Suzanne Hagell, Patricia Johnson, Rosemary Johnson, Mike Larson, Stephen Matthews, Rebecca Montgomery, Steve Olson, Matthew Peters, Anantha M. Prasad, Jack Rajala, Jad Daley, Mae Davenport, Marla R. Emery, David Fehringer, Christopher L. Hoving, Gary Johnson, Lucinda Johnson, David Neitzel, Adena Rissman, Chadwick Rittenhouse, Robert Ziel. 2014. Minnesota forest ecosystem vulnerability assessment and synthesis: a report from the Northwoods Climate Change Response Framework project
Brian H. Hill, Randy Kolka, Frank H. McCormick, Matthew A. Starry. 2014. A synoptic survey of ecosystem services from headwater catchments in the United States
V. Hernandez-Santana, X. Zhou, M.J. Helmers, H. Asbjornsen, Randy Kolka, M. Tomer. 2013. Native prairie filter strips reduce runoff from hillslopes under annual row-crop systems in Iowa, USA
Kimberly P. Wickland, Alex V. Krusche, Randy Kolka, Ayaka W. Kishimoto-Mo, Rodney A. Chimner, Stephen Ogle, Nalin Srivastava. 2013. Inland wetland mineral soils
J.Y. Wu, J.R. Thompson, Randy Kolka, K.J. Franz, T.W. Stewart. 2013. Using the storm water management model to predict urban headwater stream hydrological response to climate and land cover change
Aicam Laacouri, Edward A. Nater, Randy Kolka. 2013. Distribution and uptake dynamics of mercury in leaves of common deciduous tree species in Minnesota, U.S.A.
Todd A. Ontl, Kirsten S. Hofmockel, Cynthia A. Cambardella, Lisa Schulte, Randy Kolka. 2013. Topographic and soil influences on root productivity of three bioenergy cropping systems
Michaeleen Gerken Golay, Robert Manatt, Catherine Mabry, Janette Thompson, Randy Kolka. 2013. Restoration of herbaceous woodland plants: persistence, growth, and reproductive success of local and non-local propagules
M.E.G. Golay, J.R. Thompson, C.M. Mabry, Randy Kolka. 2013. An investigation of water nutrient levels associated with forest vegetation in highly altered landscapes
Cinzia Fissore, Christian P. Giardina, Randy Kolka. 2013. Reduced substrate supply limits the temperature response of soil organic carbon decomposition
Jason Cole, Kristofer Johnson, Richard Birdsey, Yude Pan, Craig Wayson, Kevin McCullough, Coeli Hoover, David Hollinger, John B. Bradford, Michael G. Ryan, Randy Kolka, Peter Wieshampel, Ken Clark, Nicholas Skowronski, John Hom, Scott V. Ollinger, Steve McNulty, Michael Gavazzi. 2013. Database for landscape-scale carbon monitoring sites
Donna Olson, T.J. Griffis, A. Noormets, Randy Kolka, J. Chen. 2013. Interannual, seasonal, and retrospective analysis of the methane and carbon dioxide budgets of a temperate peatland
Matthew J. Helmers, Xiaobo Zhou, Heidi Asbjornsen, Randy Kolka, Mark D. Tomer, Richard M. Cruse. 2012. Sediment removal by prairie filter strips in row-cropped ephemeral watersheds
Jessica Miesel, P. Goebel, R. Corace, David Hix, Randy Kolka, Brian J. J. Palik, David Mladenoff. 2012. Fire effects on soils in Lake States forests: A compilation of published research to facilitate long-term investigations
Douglas Kastendick, Eric K. Zenner, Brian J. J. Palik, Randy Kolka, Charles R. Blinn. 2012. Effects of harvesting on nitrogen and phosphorus availability in riparian management zone soils in Minnesota, USA
Andrew D. Parsekian, Lee Slater, Dimitrios Ntarlagiannis, James Nolan, Stephen D. Sebestyen, Randy Kolka, Paul J. Hanson. 2012. Uncertainty in peat volume and soil carbon estimated using ground-penetrating radar and probing
Carl P.J. Mitchell, Randy Kolka, Shawn Fraver. 2012. Singular and combined effects of blowdown, salvage logging, and wildfire on forest floor and soil mercury pools
Martin R. Risch, John F. DeWild, David P. Krabbenhoft, Randy Kolka, Leiming Zhang. 2012. Litterfall mercury dry deposition in the eastern USA
Jill K. Coleman Wasik, Carl P.J. Mitchell, Daniel R. Engstrom, Edward B. Swain, Bruce A. Monson, Steven J. Balogh, Jeffrey D. Jeremiason, Brian A. Branfireun, Sue Eggert, Randy Kolka, James E. Almendinger. 2012. Methylmercury declines in a boreal peatland when experimental sulfate deposition decreases
Brian J. J. Palik, Michelle Martin, Erik Zenner, Charles Blinn, Randy Kolka. 2012. Overstory and regeneration dynamics in riparian management zones of northern Minnesota forested watersheds
Randy Kolka, Aaron Steber, Ken Brooks, Charles H. (Hobie) Perry, Matt Powers. 2012. Relationships between Soil compaction and harvest season, soil texture, and landscape position for aspen forests
A.C. Guy, T.M. DeSutter, F.X.M. Casey, Randy Kolka, H. Hakk. 2012. Water quality, sediment, and soil characteristics near Fargo-Moorhead urban areas as affected by major flooding of the Red River of the north
Mark Gabriel, Randy Kolka, Trent Wickman, Laurel Woodruff, Ed. Nater. 2012. Latent effect of soil organic matter oxidation on mercury cycling within a southern boreal ecosystem
Martin Jurgensen, Rachel Tarpey, Jim Pickens, Randy Kolka, Brian J. J. Palik. 2012. Long-term effect of silvicultural thinnings on soil carbon and nitrogen pools
Matthew Powers, Randy Kolka, John B. Bradford, Brian J. J. Palik, Shawn Fraver, Martin F. Jurgensen. 2012. Carbon stocks across a chronosequence of thinned and unmanaged red pine (Pinus resinosa) stands
Robert Brooks, Sue Eggert, Keith Nislow, Randy Kolka, Celia Y. Chen, Darren M. Ward. 2012. Preliminary assessment of mercury accumulation in Massachusetts and Minnesota seasonal forest pools
Randy Kolka. 2012. Effects of fire and fuels management on water quality in eastern North America
Randy Kolka, Martin C. Rabenhorst, David Swanson. 2011. Histosols
Denys Goychuk, Michael A. Kilgore, Charles R. Blinn, Jay Coggins, Randy Kolka. 2011. The effect of timber harvesting guidelines on felling and skidding productivity in northern Minnesota
Randy Kolka, Brian J. J. Palik, Daniel P. Tersteeg, James C. Bell. 2011. Effects of riparian buffers on hydrology of northern seasonal ponds
Matthew Powers, Randy Kolka, Brian J. J. Palik, Rachel McDonald, Martin Jurgensen. 2011. Long-term management impacts on carbon storage in Lake States forests
Danielle M. Andrews, Christopher D. Barton, Randy Kolka, Charles C. Rhoades, Adam J. Dattilo. 2011. Soil and water characteristics in restored canebrake and forest riparian zones
Emma L. Witt, Christopher D. Barton, Jeffrey W. Stringer, Daniel W. Bowker, Randy Kolka. 2011. Evaluating Best Management Practices for ephemeral channel protection following forest harvest in the Cumberland Plateau - preliminary findings
Randy Kolka, Carl P.J. Mitchell, Jeffrey D. Jeremiason, Neal A. Hines, David F. Grigal, Daniel R. Engstrom, Jill K. Coleman-Wasik, Edward A. Nater, Edward B. Swain, Bruce A. Monson, Jacob A. Fleck, Brian Johnson, James E. Almendinger, Brian A. Branfireun, Patrick L. Brezonik, James B. Cotner. 2011. Mercury cycling in peatland watersheds. Chapter 11.
David F. Grigal, Peter C. Bates, Randy Kolka. 2011. Ecosystem carbon storage and flux in upland/peatland watersheds in northern Minnesota. Chapter 9.
Stephen D. Sebestyen, Carrie Dorrance, Donna Olson, Elon S. Verry, Randy Kolka, Art E. Elling, Richard (Deacon) Kyllander. 2011. Long-term monitoring sites and trends at the Marcell Experimental Forest. Chapter 2.
Randy Kolka, Stephen D. Sebestyen, John B. Bradford. 2011. An evolving research agenda at the Marcell Experimental Forest. Chapter 3.
Xiaobo Zhou, Matthew J. Helmers, Heidi Asbjornsen, Randy Kolka, Mark D. Tomer. 2010. Perennial filter strips reduce nitrate levels in soil and shallow groundwater after grassland-to-cropland conversion
Ryan M. Maher, Heidi Asbjornsen, Randy Kolka, Cynthia A. Cambardella, James W. Raich. 2010. Changes in soil respiration across a chronosequence of tallgrass prairie reconstructions
Randy Kolka, Christian P. Giardina, Jason D. McClure, Alex Mayer, Martin F. Jurgensen. 2010. Partitioning hydrologic contributions to an 'old-growth' riparian area in the Huron Mountains of Michigan, USA
Eric Merten, Nathaniel Hemstad, Sue Eggert, Lucinda Johnson, Randy Kolka, Bruce Vondracek, Raymond Newman. 2010. Relations between fish abundances, summer temperatures, and forest harvest in a northern Minnesota stream system from 1997 to 2007
Eric C. Merten, Nathaniel A. Hemstad, Randy Kolka, Raymond M. Newman, Elon S. Verry, Bruce Vondracek. 2010. Recovery of sediment characteristics in moraine, headwater streams of northern Minnesota after forest harvest
Murray C. Richardson, Carl P. J. Mitchell, Brian A. Branfireun, Randy Kolka. 2010. Analysis of airborne LiDAR surveys to quantify the characteristic morphologies of northern forested wetlands
John B. Bradford, Peter Weishampel, Marie-Louise Smith, Randy Kolka, Richard Birdsey, Scott V. Ollinger, Michael G. Ryan. 2010. Carbon pools and fluxes in small temperate forest landscapes: Variability and implications for sampling design
Jeremy C. Steil, Charles R. Blinn, Randy Kolka. 2009. Foresters' perceptions of windthrow dynamics in northern Minnesota riparian management zones
Carl P. J. Mitchell, Brian A. Branfireun, Randy Kolka. 2009. Methylmercury dynamics at the upland-peatland interface: Topographic and hydrogeochemical controls
E.L. Witt, Randy Kolka, E.A. Nater, T.R. Wickman. 2009. Influence of the forest canopy on total and methyl mercury deposition in the boreal forest
Peter Weishampel, Randy Kolka, Jennifer Y. King. 2009. Carbon pools and productivity in a 1-km² heterogeneous forest and peatland mosaic in Minnesota, USA
Jaclyn Sumner, Michael J. Vepraskas, Randy Kolka. 2009. Methods to evvaluate normal rainfall for short-term wetland hydrology assessment
David E. Pelster, Randy Kolka, Ellie E. Prepas. 2009. Overstory vegetation influence nitrogen and dissolved organic carbon flux from the atmosphere to the forest floor: Boreal Plain, Canada
Mark C. Gabriel, Randy Kolka, Trent Wickman, Ed Nater, Laurel Woodruff. 2009. Evaluating the spatial variation of total mercury in young-of-year yellow perch (Perca flavescens), surface water and upland soil for watershed-lake systems within the southern Boreal Shield
Emma L. Witt, Randy Kolka, Edward A. Nater, Trent R. Wickman. 2009. Forest fire effects on mercury deposition in the boreal forest
Christian P. Giardina, Chris Swanston, Cinzia Fissore, Gary M. King, Randy Kolka. 2009. Variable temperature sensitivity of soil organic carbon in North American forests
Cinzia Fissore, Christian P. Giardina, Randy Kolka, Carl C. Trettin. 2009. Soil organic carbon quality in forested mineral wetlands at different mean annual temperature.
Gail Wells, Deborah Hayes, Katrina M. Krause, Ann Bartuska, Susan LeVan, James R. Anderson, Tivoli Gough, Mary Beth Adams, Thomas M. Schuler, Randy Kolka, Steve Sebestyen, Laura S. Kenefic, John Brissette, Susan L. Stout, Keith Kanoti, Fred Swanson, Sarah Greene, Margaret Herring, Martin Ritchie, Carl Skinner, Tom Lisle, Elizabeth Keppeler, Leslie M. Reid, Peter Wohlegemuth, Stanley G. Kitchen, Ward McCaughey, Jim M. Guldin, Don C. Bragg, Michael Shelton, David Loftis, Cathryn Greenberg, Julia Murphy. 2009. Experimental forests and ranges : 100 years of research success stories
Charles H. (Hobie) Perry, Michael C. Amacher, William Cannon, Randy Kolka, Laurel Woodruff. 2009. The distribution of mercury in a forest floor transect across the central United States
John B. Bradford, Peter Weishampel, Marie-Louise Smith, Randy Kolka, Richard Birdsey, Scott V. Ollinger, Michael G. Ryan. 2009. Detrital carbon pools in temperate forests: magnitude and potential for landscape-scale assessment
John B. Bradford, Peter Weishampel, Marie-Louise Smith, Randy Kolka, Richard Birdsey, Scott V. Ollinger, Michael G. Ryan. 2009. Detrital carbon pools in temperate forests: magnitude and potential for landscape-scale assessment
Carl P.J. Mitchell, Brian A. Branfireun, Randy Kolka. 2008. Assessing sulfate and carbon controls on net methylmercury production in peatlands: An in situ mesocosm approach
Rachel A. Tarpey, Martin F. Jurgensen, Brian J. J. Palik, Randy Kolka. 2008. The long-term effects of silvicultural thinning and partial cutting on soil compaction in red pine (Pinus resinosa Ait.) and northern hardwood stands in the northern Great Lakes Region of the United States
Lisa Schulte, Heidi Asbjornsen, Ryan Atwell, Chad Hart, Matt Helmers, Tom Isenhart, Randy Kolka, Matt Liebman, Jeri Neal, Matt O’Neal, Silvia Secchi, Richard Schultz, Jan Thompson, Mark Tomer, John Tyndall. 2008. A targeted conservation approach for improving environmental quality
Christopher D. Barton, Danielle M. Andrews, Randy Kolka. 2008. Evaluating hydroperiod response in restored Carolina Bay Westlands using soil physicochemical properties
Carl P. J. Mitchell, Brian A. Branfireun, Randy Kolka. 2008. Total mercury and methylmercury dynamics in upland–peatland watersheds during snowmelt
Peter Weishampel, Randy Kolka. 2008. Measurement of methane fluxes from terrestrial landscapes using static, non-steady state enclosures. Chapter 12
Randy Kolka, Peter Weishampel, Mats Froberg. 2008. Measurement and importance of dissolved organic carbon. Chapter 13
John B. Bradford, Peter Weishampel, Marie-Louise Smith, Randy Kolka, David Hollinger, Richard Birdsey, Scott Ollinger, Michael G. Ryan. 2008. Landscape-scale carbon sampling strategy-lessons learned. Chapter 17
Carl P.J. Mitchell, Brian A. Branfireun, Randy Kolka. 2008. Spatial characteristics of net methylmercury production hot spots in peatlands
Cinzia Fissore, Christian P. Giardina, Randy Kolka, Carl C. Trettin, Gary M. King, Martin F. Jurgensen, Christopher D. Barton, S. Douglas McDowell. 2008. Temperature and vegetation effects on soil organic carbon quality along a forested mean annual temperature gradient in North America
George B. Landman, Randy Kolka, Rebecca R. Sharitz. 2007. Soil seed bank analysis of planted and naturally revegetating thermally-disturbed riparian forests
Aaron Steber, Ken Brooks, Charles H. (Hobie) Perry, Randy Kolka. 2007. Surface compaction estimates and soil sensitivity in Aspen stands of the Great Lakes States
Randy Kolka, James A. Thompson. 2006. Wetland geomorphology, soils, and formative processes
Jeff D. Jeremiason, Daniel R. Engstrom, Edward B. Swain, Edward A. Nater, Brian M. Johnson, James E. Almendinger, Bruce A. Monson, Randy Kolka. 2006. Sulfate Addition Increases Methylmercury Production in an Experimental Wetland
J.R. Svec, Randy Kolka, J.W. Stringer. 2005. Defining perennial, intermittent, and ephemeral channels in Eastern Kentucky: Application to forestry best management practices
Ge Sun, Steve McNulty, J. Lu, Devendra M. Amatya, Y. Liang, Randy Kolka. 2005. Regional annual water yield from forest lands and its response to potential deforestation across the southeastern United States
James A. Thompson, Randy Kolka. 2005. Soil carbon storage estimation in a forested watershed using quantitative soil-landscape modeling
Chris B. Coulter, Randy Kolka, Thompson James A. 2004. Water quality in agricultural, urban, and mixed land use watersheds
Amanda C. Abnee, James A. Thompson, Randy Kolka, Elisa M. D'Angelo, Mark S. Coyne. 2004. Landscape Influences on Potential Soil Respiration Rates in a Forested Watershed of Southeastern Kentucky
Randy Kolka, Mathew F. Smidt. 2004. Effects of forest road amelioration techniques on soil bulk density, surface runoff, sediment transport, soil moisture and seedling growth
Ge Sun, Mark Riedel, Rhett Jackson, Randy Kolka, Devendra M. Amatya, Jim Shepard. 2004. Influences of management of Southern forests on water quantity and quality
J. M. McClure, Randy Kolka, A. White. 2004. Effect of forest harvesting best management practices on coarse woody debris distribution in stream and riparian zones in three Appalachian watersheds
Laura A.B. Giese, W.M. Aust, Randy Kolka, Carl C. Trettin. 2003. Biomass and carbon pools of disturbed riparian forests
J. R. Svec, Randy Kolka, J. W. Stringer. 2003. Defining perennial, intermittent and ephemeral channels in eastern Kentucky: application to forestry best management practices
Elon (Sandy) Verry, Randy Kolka. 2003. Importance of Wetlands to Streamflow Generation
Laura A. B. Giese, W. M. Aust, Randy Kolka, Carl C. Trettin. 2003. Biomass and carbon pools of disturbed riparian forests
Richard Birdsey, David Hollinger, Linda S. Heath, Coeli Hoover, Randy Kolka, M. L. Smith, M. Ryan. 2003. Pilot Studies for Enhanced Forest Land Measurement
Randy Kolka, Carl C. Trettin, E.A. Nelson, C.D. Barton, D.E. Fletcher. 2002. Application of the EPA wetland research program approach to a floodplain wetland restoration assessment
Randy Kolka, C. C. Trettin, E. A. Nelson, C. D. Barton, D. E. Fletcher. 2002. Application of the EPA Wetland Research Program Approach to a floodplain wetland restoration assessment
Mathew F. Smidt, Randy Kolka. 2001. Alternative skid trail retirement options for steep terrain logging
Randy Kolka, Mathew Smidt. 2001. Revisiting forest road retirement
Randy Kolka, D. F. Grigal, E. A. Nater, Elon (Sandy) Verry. 2001. Hydrologic cycling of mercury and organic carbon in a forested upland-bog watershed
Laura A. Giese, W. Michael Aust, Carl C. Trettin, Randy Kolka. 2000. Spatial and temporal patterns of carbon storage and species richness in three South Carolina coastal plain riparian forests
Eric A. Nelson, Neil C. Dulohery, Randy Kolka, William H. McKee. 2000. Operational restoration of the Pen Branch bottomland hardwood and swamp wetlands - the research setting
Christopher Barton, Eric A. Nelson, Randy Kolka, Kenneth W. McLeod, William H. Conner, Michelle Lakly, Douglas Martin, John Wigginton, Carl C. Trettin, Joe Wisniewski. 2000. Restoration of a severely impacted riparian wetland system - The Pen Branch Project
C.J. Dulohery, Randy Kolka, M.R. McKevlin. 2000. Effects of a willow overstory on planted seedlings in a bottomland restoration
C. J. Dulohery, Randy Kolka, M. R. McKevlin. 2000. Effects of a willow overstory on planted seedlings in a bottomland restoration
Randy Kolka, E. A. Nelson, C. C. Trettin. 2000. Conceptual assessment framework for forested wetland restoration: the Pen Branch experience
D. F. Grigal, Randy Kolka, J. A. Fleck, E. A. Nater. 2000. Mercury budget of an upland-peatland watershed
Randy Kolka, J. H. Singer, C. R. Coppock, W. P. Casey, C. C. Trettin. 2000. Influence of restoration and succession on bottomland hardwood hydrology
Randy Kolka, E.A. Nater, D.F. Grigal, E.S. Verry. 1999. Atmospheric Inputs of Mercury and Organic Carbon into a Forested Upland/Bog Watershed
Randy Kolka, D.F. Grigal, E.S. Verry, E.A. Nater. 1999. Mercury and Organic Carbon Relationships in Streams Draining Forested Upland/Peatland Watersheds
A.S. Knox, A.P. Gamerdinger, D.C. Adriano, Randy Kolka, D.I. Kaplan. 1999. Sources and Practices Contributing to Soil Contamination
Randy Kolka, D. F. Grigal, Elon (Sandy) Verry, E. A. Nater. 1999. Mercury and Organic Carbon Relationships in Streams Draining Forested Upland/Peatland Watersheds
Randy Kolka, E. A. Nater, Elon (Sandy) Verry. 1999. Atmospheric Inputs of Mercury and Organic Carbon into a Forested Upland/Bog Watershed
Randy Kolka, Carl C. Trettin, E.A. Nelson. 1998. Development of an Assessment Framework for Restored Forested Wetlands
Randy Kolka, Eric A. Nelson, Ronald E. Bonar, Neil C. Dulohery, David Gartner. 1998. The Pen Branch Project: Restoration of a Forested Wetland in South Carolina
Randy Kolka, Carl C. Trettin, E.A. Nelson, W.H. Conner. 1998. Tree Seedlings Establishment Across a Hydrologic Gradient in a Bottomland Restoration
Randy Kolka, Ann Wolf. 1998. Estimating actual evapotranspiration for forested sites: modifications to the Thornthwaite Model
Rolfe A. Leary, Kevin Nimerfro, Margaret Holdaway, Gary Brand, Tom Burk, Randy Kolka, Ann Wolf. 1997. Height growth modeling using second order differential equations and the importance of intial height growth
Randy Kolka, D.F. Grigal, E.A. Nater. 1996. Forest soil mineral weathering rates: use of multiple approaches

University of Minnesota, Ph.D., Soil Science, 1996
University of Minnesota, M.S., Soil Science, 1993
University of Wisconsin - Stevens Point, B.S., Soil Science, 1990

Last updated March 10, 2026

Randy Kolka, PhD

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