Treesearch
Displaying 6,451 - 6,460 of 64,649 Publications- Quantifying the spatial variability of species-specific tree transpiration across hillslopes is important for estimating watershed-scale evapotranspiration (ET) and predicting spatial drought effects on vegetation. The objectives of this study are to (1) assess sap flux density (Js) and tree-level transpiration (Ts) across three contrasting zones a (riparian buffer, mid-hillslope and upland-hillslope, (2) determine how species-specific Jsresponds to vapour pressure deficit (VPD) and (3) estimate watershed-level transpiration (Tw) using Tsderived from each zone. During 2015 and 2016, we...AuthorsJohnny Boggs, Ge Sun, Jean‐Christophe Domec, Steve McNultyKeywordsSourceHydrological ProcessesYear2021
- In the social sciences, the topic of imaginaries refers to socially constructed, taken-for-granted meanings about events, places, and people. Imaginaries are created symbolically and rhetorically, through claims about self, others, and places; they help people make sense of individual and shared experiences. This study explores how residents of a rural community discursively construct imaginaries to address tourism-related transitions. Telephone interviews were conducted with three types of residents (leaders, permanent residents, and second homeowners) in Burke, Vermont (USA). Results...AuthorsPatricia A. Stokowski, Walter F. Kuentzel, Monika Derrien, Yumiko L. JakobcicKeywordsSourceJournal of Rural Studies. 87(1): 243-253.Year2021
- This is 1 of 23 guides to help Southeastern U.S. producers of economically important agricultural commodities build resilience to, prepare for, and recover from hurricane impacts. All guides can be found on the USDA Southeast Climate Hub Hurricane Preparation and Recovery Commodity Guides website.AuthorsChris TysonSourceGeneral Technical Report (1 of 23 volumes)Year2021
- Surface roughness – a key control on land-atmosphere exchanges of heat and momentum – differs between dormant and growing seasons. However, how surface roughness shifts seasonally at fine time scales (e.g., days) in response to changing canopy conditions is not well understood. This study: (1) explores how aerodynamic resistance changes seasonally; (2) investigates what drives these seasonal shifts, including the role of vegetation phenology; and (3) quantifies the importance of including seasonal changes of aerodynamic resistance in "big leaf" models of sensible heat flux (H). We evaluated...AuthorsAdam M. Young, Mark A. Friedl, Bijan Seyednasrollah, Eric Beamesderfer, Carlos M. Carrillo, Xiaolu Li, Minkyu Moon, M. Altaf Arain, Dennis D. Baldocchi, Peter D. Blanken, Gil Bohrer, Sean P. Burns, Housen Chu, Ankur R. Desai, Timothy J. Griffis, David Hollinger, Marcy E. Litvak, Kim Novick, Russell L. Scott, Andrew E. Suyker, Joseph Verfaillie, Jeffrey D. Wood, Andrew D. RichardsonKeywordsSourceAgricultural and Forest MeteorologyYear2021
- 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