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Displaying 7,051 - 7,060 of 64,641 Publications- Forest Service Research and Development (R&D) develops practical applications of emerging and existing knowledge to inform forest management. Scientific understanding of land management activities helps clarify options, opportunities, and tradeoffs land managers face. The Forest Service research legacy is indisputable, long-lasting, and invaluable to the American public. Forest Service research on climate and carbon improves the Nation's forests and grasslands so they can continue to provide a wide range of benefits to the country and the world.Forest Service R&D, along with a network of...AuthorsJennifer Hayes, Lara T. MurrayKeywordsSourceFS-1175. Washington, D.C.: U.S. Department of Agriculture, Forest Service, Research & Development. 19p.Year2021
- The northern spotted owl (Strix occidentalis caurina) inhabits older coniferous forests in the Pacific Northwest and has been at the center of forest management issues in this region. The immediate threats to this federally listed species include habitat loss and competition with barred owls (Strix varia), which invaded from eastern North America. We conducted a prospective meta-analysis to assess population trends and factors affecting those trends in northern spotted owls using 26 years of survey and capture-recapture data from 11 study areas across the owls' geographic range to analyze...AuthorsKenneth P. Burnham, Peter C. Carlson, Tara Chestnut, Mary M. M. Conner, Krista E. Dilione, Eric D. Forsman, Elizabeth M. Glenn, Scott A. Gremel, Keith A. Hamm, Dale R. Herter, J. Mark Higley, Rob B. Horn, Julianna M. Jenkins, William L. Kendall, David W. Lamphear, Christopher McCafferty, Trent L. McDonald, Janice A. Reid, Jeremy T. Rockweit, David C. Simon, Stan Sovern, James K. Swingle, Heather Wise, Alan B. Franklin, Katie M. Dugger, Damon B. Lesmeister, Raymond J. Davis, J. David Wiens, Gary C. White, James D. Nichols, James E. Hines, Charles B. Yackulic, Carl J. Schwarz, Steven H. Ackers, L. Steven Andrews, Larissa L. Bailey, Robin Bown, Jesse BurgherKeywordsSourceBiological Conservation. 259(suppl): 109168.Year2021
- Over the last century in the circumpolar north, notable terrestrial ecosystem changes include shrub expansion and an intensifying wildfire regime. Shrub invasion into tundra may be further accelerated by wildfire disturbance, which creates opportunities for establishment where recruitment is otherwise rare. The Seward Peninsula currently experiences more frequent and larger fires than other tundra regions in Alaska. There are areas of overlapping burn scars dating back to the 1950s. Using a chronosequence approach, we examined vegetation and ecosystem dynamics in tussock tundra. Increasing...AuthorsTeresa Hollingsworth, Amy L. Breen, Rebecca E. Hewitt, Michelle C. MackKeywordsSourceArctic, Antarctic, and Alpine Research. 53(1): 93-109.Year2021
- The "NTFPs from Trees" factsheet series explains uses, markets, status, and management implications for several tree species valued for nontimber forest products. **Species status information has been revised to reflect updated data (June 2021).**AuthorsJames L. ChamberlainSourceScience Update SRS-SU-145. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 2 p.Year2021
- Currently, quantifying phenology at landscape to regional scales is not feasible with field data or near-surface sensors. Consequently, the spatial and temporal complexity of phenology has been assessed using satellite-based estimates (land surface phenology, LSP). While estimates from Moderate Resolution Imaging Spectroradiometer (MODIS) capture intraannual patterns of phenology, they have relatively low spatial resolution. Estimates from sensors like Landsat capture finer spatial detail but are often limited by Landsat’s temporal resolution. We implemented a spatio-temporal image fusion...AuthorsTy C. Nietupski, Robert Kennedy, Hailemariam Temesgen, Becky K. KernsKeywordsSourceInternational Journal of Applied Earth Observation and Geoinformation. 99: 102323.Year2021
- Frequent, small wildfires can pose dangers to homes in the wildland–urban interface, but are not often included in wildfire hazard models. We assessed patterns of small wildfire occurrence probability in the Northeast region of the United States, focusing on (1) spatial and seasonal variations; (2) differences between small and large fires (size threshold of 4 ha); and (3) how predicted probabilities are influenced by inconsistent wildfire definitions in urbanised landscapes. We analysed fire incident report data from 2005 to 2017 to parameterise maximum entropy (MaxEnt) models based on...AuthorsAmanda R. Carlson, Megan E. Sebasky, Matthew Peters, Volker C. RadeloffKeywordsSourceInternational Journal of Wildland FireYear2021
- AuthorsThomas Brandeis, Consuelo BrandeisKeywordsSourceForest ScienceYear2021
- The American chestnut (Castanea dentata) was once a dominant tree species in the Appalachian Mountains and played a critical role in the ecological system. However, it was nearly eliminated by chestnut blight caused by the Ascomycetous fungusCryphonectria parasitica . Identification of compounds specific to species and backcross hybrids may help further refine disease resistance breeding and testing. Phenolic compounds produced by plants are significant to their defense mechanisms against fungal pathogens. Therefore, an analytical platform has been developed to estimate the total phenolic...AuthorsJinyan She, Chathuri U. G. Mohottige, Mary King, Yi Jiang, Matt Mlsna, Stacy Byrd, Richard Baird, Todd MlsnaKeywordsSourceJournal of Agricultural Chemistry and EnvironmentYear2021
- Resistance against infection by the fungus Aspergillus flavus Link in commercial maize (Zea mays L.) is the topic of many studies, but few studies have investigated the effects of A. flavus infection on gene expression levels in ear kernels. A crucial component of gene expression profiling by RT-qPCR is having a reliable set of reference genes that show relatively constant expression across the treatments and phenotypes under study. Currently, however, there is no published information on reference genes suitable for measuring changes in kernel gene expression levels after infection with...AuthorsDafne Alves Oliveira, Juliet D. Tang, Marilyn L. WarburtonKeywordsSourceToxinsYear2021
- 1. The complex effects of global environmental changes on ecosystems result from the interaction of multiple stressors, their direct impacts on species and their indirect impacts on species interactions. Air pollution (and resulting depletion of soil base cations) and biotic invasion (e.g. beech bark disease [BBD] complex) are two stressors that are affecting the foundational tree species of northern hardwood forests, sugar maple and American beech, in northeastern North America. 2. At the Hubbard Brook Experimental Forest in New Hampshire, a watershed-scale calcium (Ca) addition in 1999...AuthorsNatalie L. Cleavitt, John J. Battles, Timothy J. Fahey, Natalie S. van DoornSourceJournal of Ecology. 109(7): 2754-2768Year2021