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Displaying 6,981 - 6,990 of 65,178 Publications- Methane (CH4) emissions from natural landscapes constitute roughly half of global CH4 contributions to the atmosphere, yet large uncertainties remain in the absolute magnitude and the seasonality of emission quantities and drivers. Eddy covariance (EC) measurements of CH4 flux are ideal for constraining ecosystem-scale CH4 emissions due to quasi-continuous and high-temporal-resolution CH4 flux measurements, coincident carbon dioxide, water, and energy flux measurements, lack of ecosystem disturbance, and increased availability of datasets over the last decade. Here, we (1) describe the...AuthorsKyle B. Delwiche, Sara Helen Knox, Avni Malhotra, Etienne Fluet-Chouinard, Gavin McNicol, Sarah Feron, Zutao Ouyang, Dario Papale, Carlo Trotta, Eleonora Canfora, You-Wei Cheah, Danielle Christianson, Ma Carmelita R. Alberto, Pavel Alekseychik, Mika Aurela, Dennis Baldocchi, Sheel Bansal, David P. Billesbach, Gil Bohrer, Rosvel Bracho, Nina Buchmann, David I Campbell, Gerardo Celis, Jiquan Chen, Weinan Chen, Housen Chu, Higo J. Dalmagro, Sigrid Dengel, Ankur R. Desai, Matteo Detto, Han Dolman, Elke Eichelmann, Eugenie Euskirchen, Daniela Famulari, Kathrin Fuchs, Mathias Goeckede, Sébastien Gogo, Mangaliso J. Gondwe, Jordan P. Goodrich, Pia Gottschalk, Scott L. Graham, Martin Heimann, Manuel Helbig, Carole Helfter, Kyle S. Hemes, Takashi Hirano, David Hollinger, Lukas Hörtnagl, Hiroki Iwata, Adrien Jacotot, Gerald Jurasinski, Minseok Kang, Kuno Kasak, John King, Janina Klatt, Franziska Koebsch, Ken W. Krauss, Derrick Y. F. Lai, Annalea Lohila, Ivan Mammarella, Luca Belelli Marchesini, Giovanni Manca, Jaclyn Hatala Matthes, Trofim Maximov, Lutz Merbold, Bhaskar Mitra, Timothy H. Morin, Eiko Nemitz, Mats B. Nilsson, Shuli Niu, Walter C. Oechel, Patricia Y. Oikawa, Keisuke Ono, Matthias Peichl, Olli Peltola, Michele L. Reba, Andrew D. Richardson, William Riley, Benjamin R. K. Runkle, Youngryel Ryu, Torsten Sachs, Ayaka Sakabe, Camilo Rey Sanchez, Edward A. Schuur, Karina V R. Schäfer, Oliver Sonnentag, Jed P. Sparks, Ellen Stuart-Haëntjens, Cove Sturtevant, Ryan C. Sullivan, Daphne J. Szutu, Jonathan E. Thom, Margaret S. Torn, Eeva-Stiina Tuittila, Jessica Turner, Masahito Ueyama, Alex C. Valach, Rodrigo Vargas, Andrej Varlagin, Alma Vazquez-Lule, Joseph G. Verfaillie, Timo Vesala, George L. Vourlitis, Eric J. Ward, Christian Wille, Georg Wohlfahrt, Guan Xhuan Wong, Zhen Zhang, Donatella Zona, Lisamarie Windham-Myers, Benjamin Poulter, Robert B. JacksonSourceEarth System Science DataYear2021
- Mercury mining and its use in gold mine operations left a legacy of contamination in northern California. Contaminated sediments and water continue to affect local and downstream ecosystems. To assess the efficacy of biochar-amended soils on decreasing Hg transport, biochar was used to amend rock and sediment columns and mesocosms to decrease suspended sediment and associated mercury (Hg) in storm water runoff from Sierra Nevada hydraulic mines. Mercury-contaminated storm water runoff and hydraulic mine debris were collected from two hydraulic mine sites in the Yuba River, California...AuthorsMadison Brandt, Deborah S. Page-Dumroese, Jackson Webster, Carrie MonohanKeywordsSourceEnergiesYear2021
- In 2016, the USDA Forest Service, the largest wildfire management organization in the world, initiated the risk management assistance (RMA) program to improve the quality of strategic decision-making on its largest and most complex wildfire events. RMA was designed to facilitate a more formal risk management process, including the use of the best available science and emerging research tools, evaluation of alternative strategies, consideration of the likelihood of achieving objectives, and analysis of tradeoffs across a diverse range of incident objectives. RMA engaged personnel from a...AuthorsDave E. Calkin, Christopher D. O'Connor, Matthew P. Thompson, Richard StrattonSourceForestsYear2021
- Silvopasture, the combination of trees, forage, and livestock, is a management practice that is gaining interest throughout the southeastern U.S. This research analyzed a hay-based alley cropping field trial that is transitioning into a silvopasture system. We planted four different tree spacings—2.4 × 2.4 m, 2.4 × 3.0 m, 3.0 × 3.0 m, and 1.8 × 3.0 m (8 × 8 ft, 8 × 10 ft, 10 × 10ft, and 6 × 10 ft)—of loblolly pine (Pinus taeda L.) and used secondary data for the possible planting of two different grass species—big bluestem (Andropogon gerardii Vitman) and switchgrass (Panicum virgatum L.)....AuthorsKenneth Dunn, Lori Unruh Snyder, James McCarter, Gregory E. Frey, Joshua Idassi, David Schnake, Frederick CubbageKeywordsSourceSustainabilityYear2021
- It is commonly believed that climate plays an important role in shaping the patterns of plant species richness. However, it remains unclear how climate may affect plant richness across large spatial scales and also over longterms, for example across massive arid regions during the Quaternary and into the future. To fill this knowledge gap, we examined the long-term trends in plant species richness across vast drylands in China based on our newly developed climate-species richness models. We first generated optimal random forest models based on the relationships between the current (CUR,...AuthorsYing Sun, Yuan Sun, Shuran Yao, Muhammad Adnan Akram, Weigang Hu, Longwei Dong, Hailing Li, Maohong Wei, Haiyang Gong, Shubin Xie, Muhammad Aqeel, Jinzhi Ran, Abraham Allan Degen, Qinfeng Guo, Jianming DengKeywordsSourceEcological IndicatorsYear2021
- This report traces the flow of Oregon’s 2017 timber harvest through the primary wood products industry with detailed descriptions of the structure, timber use, operations, and condition of Oregon’s industry. It is the fourth in a series of reports that periodically update the status of the industry, and is based on a census of timber-using facilities conducted during 2018. Historical forest products industry changes are discussed, as well as trends in harvest, production, mill residue, and sales. Also examined are employment and worker earnings in the state’s primary and secondary forest...AuthorsEric A. Simmons, Kate C. Marcille, Gary J. Lettman, Todd A. Morgan, Dorian C. Smith, Luke A. Rymniak, Glenn ChristensenKeywordsSourceGen. Tech. Rep. PNW-GTR-997. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 63 p.Year2021
- Urbanization has a homogenizing effect on biodiversity and leads to communities with fewer native species and lower conservation value. However, few studies have explored whether or how land management by urban residents can ameliorate the deleterious effects of this homogenization on species composition. We tested the effects of local (land management) and neighborhood-scale (impervious surface and tree canopy cover) features on breeding bird diversity in six US metropolitan areas that differ in regional species pools and climate. We used a Bayesian multiregion community model to assess...AuthorsSusannah B. Lerman, Desirée L. Narango, Meghan L. Avolio, Anika R. Bratt, Jesse M. Engebretson, Peter M. Groffman, Sharon J. Hall, James B. Heffernan, Sarah E. Hobbie, Kelli L. Larson, Dexter H. Locke, Christopher Neill, Kristen C. Nelson, Josep Padullés Cubino, Tara L. E. TrammellKeywordsSourceEcological ApplicationsYear2021
- Due to global change, temperate forests are expected to face growing threats to forest health (e.g. insects/disease) and increasing probabilities of severe disturbances (e.g. wildfires), which may result in amplified tree mortality against a backdrop of a changing climate and associated ecosystem/atmospheric feedbacks (i.e. increased rates of dead wood decay/combustion). Despite these expectations, we lack a fundamental understanding of current forest biomass trends among live and dead components across large spatial and temporal domains. The goal of this study was to examine changes in...AuthorsChristopher W. W. Woodall, S. Fraver, Sonja Oswalt, Sara A. Goeking, Grant M. Domke, M.B. RussellKeywordsSourceEnvironmental Research LettersYear2021
- Soil health is a key element in enhancing agricultural production, environmental sustainability, and food system resilience (Farnsworth 2015; Stevens 2018). The USDA Natural Resources Conservation Service (NRCS) defines soil health as "the continued capacity of soil to function as a vital living ecosystem that sustains plants, animals, and humans" (Pankhurst et al. 1997; Farnsworth 2015; Bowman et al. 2016). A common theme points to soil health as an indicator of the soil's ability to support life, withstand environmental stresses, and endure as an important part of a resilient ecosystem....AuthorsRoderick M. Rejesus, Serkan Aglasan, Lynn G. Knight, Michel A. Cavigelli, Curtis J. Dell, Erin D. Lane, David HollingerKeywordsSourceJournal of Soil and Water ConservationYear2021
- The atmospheric boundary layer mediates the exchange of energy, matter, and momentum between the land surface and the free troposphere, integrating a range of physical, chemical, and biological processes and is defined as the lowest layer of the atmosphere (ranging from a few meters to 3 km). In this review, we investigate how continuous, automated observations of the atmospheric boundary layer can enhance the scientific value of co-located eddy covariance measurements of land-atmosphere fluxes of carbon, water, and energy, as are being made at FLUXNET sites worldwide. We highlight four...AuthorsManuel Helbig, Tobias Gerken, Eric R. Beamesderfer, Dennis D. Baldocchi, Tirtha Banerjee, Sébastien C. Biraud, William O.J. Brown, Nathaniel A. Brunsell, Elizabeth Burakowski, Sean P. Burns, Brian J. Butterworth, W. Stephen Chan, Kenneth J. Davis, Ankur R. Desai, Jose D. Fuentes, David Hollinger, Natascha Kljun, Matthias Mauder, Kimberly A. Novick, John M. Perkins, David A. Rahn, Camilo Rey-Sanchez, Joseph A. Santanello, Russell L. Scott, Bijan Seyednasrollah, Paul C. Stoy, Ryan C. Sullivan, Jordi Vilà-Guerau de Arellano, Sonia Wharton, Chuixiang Yi, Andrew D. RichardsonKeywordsSourceAgricultural and Forest MeteorologyYear2021