Treesearch
Displaying 7,551 - 7,560 of 64,690 Publications- One of the first forest genetics studies in the United States launched in 1912 in the Pacific Northwest. Researchers at that time gathered Douglas-fir seeds from various locations in Oregon and Washington, raised the seedlings in a nursery, then transplanted them to places other than where the seeds originated.The results had wide-ranging impact, revealing a link between seed origin and where the resulting seedlings were likely to thrive. These results led to the delineation of “seed zones,” an essential set of guidelines used for decades in reforestation projects to ensure that newly...AuthorsJohn Kirkland, Brad St. ClairKeywordsSourceScience Findings 235. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 5 p.Year2021
- Sediment fences are often used to monitor hillslope erosion, but these can underestimate sediment yields due to overtopping of runoff and associated sediment. We modified four sediment fences to collect and measure the runoff and sediment that overtopped the fence in addition to the sediment deposited behind the fence. Specific objectives were to: (1) determine the catch efficiency of sediment fences measuring post‐fire hillslope erosion; (2) assess particle sorting of sand, silt/clay, and organic matter from each hillslope through the sediment fence and subsequent runoff collection...AuthorsCodie Wilson, Stephanie K. Kampf, Joseph Wagenbrenner, Lee H. MacDonald, Hunter GleasonKeywordsSourceEarth Surface Processes and Landforms. 46(1): 267-279.Year2021
- Soil productivity is essential to the sustained production of forest ecosystem goods and services. Timber harvests may lead to negative ecological impacts to the soil environment, thus reducing both soil and forest long-term productivity. Impacts caused by timber harvests are site-specific, and soil monitoring at various times post-harvest is critical to understanding both short- and long-term damage. Soil compaction is one of the most important issues that arise from harvest operations because it can alter many soil properties and processes including soil bulk density, gas diffusivity,...AuthorsLeslee J. Crawford, Robert Heinse, Mark J. Kimsey, Deborah S. Page-DumroeseKeywordsSourceGen. Tech. Rep. RMRS-GTR-421. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 39 p.Year2021
Save Our Species: A Blueprint for Restoring Butternut (Juglans cinerea) across Eastern North America
Butternut is a relatively uncommon hardwood tree native to eastern North America. The species' abundance has declined over the past 50 years, primarily because of an invasive pathogen (Ophiognomonia clavigignenti-juglandacearum [Oc-j]) and loss of suitable habitat for regeneration. Although genetic diversity of butternut is highest along the southern range edge, genetic diversity rangewide is fairly high, except in small and isolated populations. Although there is little evidence for even moderate resistance in native butternut, hybrids with Japanese walnut, a closely related species,...AuthorsCarolyn Pike, Martin Williams, Andrea Brennan, Keith Woeste, James Jacobs, Sean Hoban, Melanie Moore, Jeanne Romero-SeversonSourceJournal of ForestryYear2021- ForestGEO is a network of scientists and long-term forest dynamics plots (FDPs) spanning the Earth's major forest types. ForestGEO's mission is to advance understanding of the diversity and dynamics of forests and to strengthen global capacity for forest science research. ForestGEO is unique among forest plot networks in its large-scale plot dimensions, censusing of all stems ≥1 cm in diameter, inclusion of tropical, temperate and boreal forests, and investigation of additional biotic (e.g., arthropods) and abiotic (e.g., soils) drivers, which together provide a holistic view of forest...AuthorsS.J. Davies, I. Abiem, K. Abu Salim, S. Aguilar, D. Allen, A. Alonso, K. Anderson-Teixeira, A. Andrade, G. Arellano, P.S. Ashton, P.J. Baker, M.E. Baker, J.L. Baltzer, Y. Basset, P. Bissiengou, S. Bohlman, N.A. Bourg, W.Y. Brockelman, S. Bunyavejchewin, D.F.R.P. Burslem, M. Cao, D. Cárdenas, L. Chang, C. Chang-Yang, K. Chao, W. Chao, H. Chapman, Y. Chen, R.A. Chisholm, C. Chu, G. Chuyong, K. Clay, L.S. Comita, R. Condit, Susan Cordell, H.S. Dattaraja, A.A. de Oliveira, J. den Ouden, M. Detto, C. Dick, X. Du, Á. Duque, S. Ediriweera, E.C. Ellis, N.L.E. Obiang, S. Esufali, C.E.N. Ewango, E.S. Fernando, J. Filip, G.A. Fischer, R. Foster, T. Giambelluca, Christian P. Giardina, G.S. Gilbert, E. Gonzalez-Akre, I.A.U.N. Gunatilleke, C.V.S. Gunatilleke, Z. Hao, B.C.H. Hau, F. He, H. Ni, R.W. Howe, S.P. Hubbell, A. Huth, F. Inman-Narahari, A. Itoh, D. Janík, P.A. Jansen, M. Jiang, D.J. Johnson, F.A. Jones, M. Kanzaki, D. Kenfack, S. Kiratiprayoon, K. Král, L. Krizel, S. Lao, A.J. Larson, Y. Li, X. Li, C.M. Litton, Yu Liu, S. Liu, S.K.Y. Lum, M.S. Luskin, J.A. Lutz, H.T. Luu, K. Ma, J. Makana, Y. Malhi, A. Martin, C. McCarthy, S.M. McMahon, W.J. McShea, H. Memiaghe, X. Mi, D. Mitre, M. Mohamad, L. Monks, H.C. Muller-Landau, P.M. Musili, J.A. Myers, A. Nathalang, K.M. Ngo, N. Norden, V. Novotny, M.J. O'Brien, D. Orwig, R. Ostertag, K. Papathanassiou, G.G. Parker, R. Pérez, I. Perfecto, R.P. Phillips, N. Pongpattananurak, H. Pretzsch, H. Ren, G. Reynolds, L.J. Rodriguez, S.E. Russo, L. Sack, W. Sang, J. Shue, A. Singh, G.M. Song, R. Sukumar, I. Sun, H.S. Suresh, N.G. Swenson, S. Tan, S.C. Thomas, D. Thomas, J. Thompson, B.L. Turner, Amanda L. Uowolo, M. Uriarte, R. Valencia, J. Vandermeer, A. Vicentini, M. Visser, T. Vrska, X. Wang, X. Wang, G.D. Weiblen, T.J.S. Whitfeld, A. Wolf, S.J. WrightKeywordsSourceBiological Conservation. 253: 108907.Year2021
- Previous studies have shown that moderate concentrations of Chinese tallow leaf litter can quickly reduce dissolved oxygen and pH in the aquatic environment. While these studies mostly focus on its effects on the performance of amphibians, this study focuses on determining the causes of deoxygenation and acid water. We also examined the effects of Chinese tallow litter on other water quality parameters and how changes may influence microbial communities in aquatic environments. We used laboratory and outdoor experiments to demonstrate the effects of Chinese tallow litter on aquatic...AuthorsRaymond D. Montez, Daniel Saenz, Alexandra Martynova-Van Kley, James Van Kley, Armen Nalian, Kenneth FarrishKeywordsSourceAquatic EcologyYear2021
- Wildfire-generated snags provide key habitat for wildlife associated with recently disturbed forests, offering nesting and foraging resources for several woodpecker species. Snag harvest through post-fire salvage logging provides economic value but reduces habitat in recently burned forests. Managers of recently burned forests often must identify suitable woodpecker habitat within timeframes precluding field surveys. We developed nesting habitat suitability models for the Lewis’s woodpecker (Melanerpes lewis) - a species of conservation concern potentially impacted by salvage logging - to...AuthorsTodd B. Cross, Quresh Latif, Jonathan G. Dudley, Vicki A. SaabKeywordsSourceBiological Conservation. 253: 108811.Year2021
- This study evaluated the hypothesis that urban-tree planting increases neighborhood gentrification in Portland, Oregon. We defined gentrification as an increase in the median sales price of single-family homes in a Census tract compared to other tracts in the city after accounting for differences in the housing stock such as house size and number of bathrooms. We used tree-planting data from the non-profit Friends of Trees, who have planted 57,985 yard and street trees in Portland (1990–2019). We estimated a mixed model of gentrification (30 years and 141 tracts) including random intercepts...AuthorsJeffrey P. Prestemon, David T. Butry, Abigail R. Kaminski, Geoffrey Donovan, Vicente MonleonKeywordsSourceForest Policy and Economics. 124: 102387.Year2021
- Over the past few years, a number of improvements have been made to global surface air temperature datasets and climate models that facilitate increased statistical reliability when determining temperature anomalies and trends. Recent measurements show a continued rise in land surface temperatures, both globally and across the United States. These trends have been increasing since the 1970s with the world’s five warmest years on record (based on data since 1880) occurring since 2015. Maintaining consistent, high-quality water resources is a primary issue for public and environmental...AuthorsDavid.H Levinson, Christopher J. FettigKeywordsSourceClimate Change and Global Public Health. New York: Springer. 51-74. Chapter 3Year2021
- In this report, we present an update on the status of longleaf pine in the Southern United States. Specifically, we provide selected tables and summary data for the two longleaf pine-dominant forest types—the longleaf pine type and the longleaf pine/oak type—using the latest round of forest inventory data from each of the nine States encompassing the range of longleaf pine. The report represents 7–8 years of change in the longleaf pine resource, and it provides a comparison with a previously published report on the history and current condition of longleaf pine. The data presented here...AuthorsChristopher M. Oswalt, Jim M. GuldinKeywordsSourceNon-refereed general technical report: early release.Year2021