Treesearch
Displaying 9,671 - 9,680 of 65,202 Publications- Thousand cankers disease (TCD) is caused by a fungus (Geosmithia morbida) vectored by the walnut twig beetle (WTB), Pityophthorus juglandis (Coleoptera: Curculionidae: Scolytinae). This pest complex was first described in Colorado where it has caused the widespread death of eastern black walnut (Juglans nigra) along the Front Range and throughout the Western United States (Tisserat and others 2009). In August 2010, TCD was found in Knoxville, TN—the first discovery of the disease within the native range of black walnut (Grant and others 2011). Since that time, six other States in the...AuthorsJennifer Juzwik, Melanie J. Moore, Geoffrey Williams, Matthew GinzelSourceGen. Tech. Rep. SRS-250. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research StationYear2020
- Woodboring beetles (Cerambycidae and Buprestidae) are common in coniferous forests of the Western United States, where they are considered secondary forest pests because they generally colonize trees killed or weakened by disturbance (Furniss and Carolin 1977), including wildfire and outbreaks of primary forest pests such as bark beetles (Scolytinae). Disturbances caused by wildfire and bark beetle outbreak (BBO) are expected to be increasingly common in the coming decades (Bentz and others 2010, Kitzberger and others 2017), providing more potential habitat for woodboring beetles. Although...AuthorsChris Ray, Daniel R. Cluck, Robert L. Wilkerson, Rodney B. Siegel, Angela M. White, Gina L. Tarbill, Sarah C. Sawyer, Chrissy HowellYear2020
- The majority of variation in six traits critical to the growth, survival and reproduction of plant species is thought to be organised along just two dimensions, corresponding to strategies of plant size and resource acquisition. However, it is unknown whether global plant trait relationships extend to climatic extremes, and if these interspecific relationships are confounded by trait variation within species. We test whether trait relationships extend to the cold extremes of life on Earth using the largest database of tundra plant traits yet compiled. We show that tundra plants demonstrate...AuthorsH. J. D. Thomas, A. D. Bjorkman, I. H. Myers-Smith, S. C. Elmendorf, J. Kattge, S. Diaz, M. Vellend, D. Blok, J. H. C. Cornelissen, B. C. Forbes, G. H. R. Henry, R. D. Hollister, S. Normand, J. S. Prevéy, C. Rixen, G. Schaepman-Strub, M. Wilmking, S. Wipf, W. K. Cornwell, P. S. A. Beck, D. Georges, S. J. Goetz, K. C. Guay, N. Rüger, N. A. Soudzilovskaia, M. J. Spasojevic, J. M. Alatalo, H. D. Alexander, A. Anadon-Rosell, S. Angers-Blondin, M. te Beest, L. T. Berner, R. G. Björk, A. Buchwal, A. Buras, M. Carbognani, K. S. Christie, L. S. Collier, E. J. Cooper, B. Elberling, A. Eskelinen, E. R. Frei, O. Grau, P. Grogan, M. Hallinger, M. M. P. D. Heijmans, L. Hermanutz, J. M. G. Hudson, J. F. Johnstone, K. Hülber, M. Iturrate-Garcia, C. M. Iversen, F. Jaroszynska, E. Kaarlejarvi, A. Kulonen, L. J. Lamarque, T. C. Lantz, E. Lévesque, C. J. Little, A. Michelsen, A. Milbau, J. Nabe-Nielsen, S. S. Nielsen, J. M. Ninot, S. F. Oberbauer, J. Olofsson, V. G. Onipchenko, A. Petraglia, S. B. Rumpf, R. Shetti, J. D. M. Speed, K. N. Suding, K. D. Tape, M. Tomaselli, A. J. Trant, U. A. Treier, M. Tremblay, S. E. Venn, T. Vowles, S. Weijers, P. A. Wookey, T. J. Zamin, M. Bahn, B. Blonder, P. M. van Bodegom, B. Bond-Lamberty, G. Campetella, B. E. L. Cerabolini, F. S. Chapin, J. M. Craine, M. Dainese, W. A. Green, S. Jansen, M. Kleyer, P. Manning, Ü Niinemets, Y. Onoda, W. A. Ozinga, J. Peñuelas, P. Poschlod, P. B. Reich, B. Sandel, B. S. Schamp, S. N. Sheremetiev, F. T. de VriesKeywordsSourceNature Communications. 11(1): 1-12.Year2020
- Scientifically informed strategies to manage naturally disturbed forests are critical to support the sustained provisioning of ecosystem goods and services. In fire-adapted ecosystems, catastrophic canopy removal can disrupt surface fuel continuity and challenge the continued use of low-intensity prescribed fire. Although salvage logging is used globally after natural disturbance events, little information is available on how salvage logging interacts with subsequent use of prescribed fire. This study investigated the impacts of operational-scale prescribed fire on Pinus palustris (longleaf...AuthorsJonathan S. Kleinman, Jonathan D. Goode, Justin L. Hart, Daniel C. DeyKeywordsSourceForest Ecology and ManagementYear2020
- The unique terrain, geography, and climate patterns of the eastern United States encourage periodic occurrences of catastrophic ice storms capable of large-scale damage or destruction of forests. However, the pervasive and persistent effects of these glaze events on regional forest distribution and composition have rarely been studied. In the southeastern US, ice storm frequency and intensity increase with increasing latitude and along the complex gradients from the coast (low, flat, sediment controlled and temperature moderated near the ocean) to the interior (high, rugged, bedrock...AuthorsDeliang Lu, Lauren S. Pile, Dapao Yu, Jiaojun Zhu, Don C. Bragg, G. Geoff. WangSourceForest Ecology and ManagementYear2020
- Tree mortality is a natural process in all forest ecosystems. High mortality can be an indicator of forest health problems. On a regional scale, high mortality levels may indicate widespread insect or disease impacts. High mortality may also occur if a large proportion of the forest in a particular region is made up of older, senescent stands. The approach presented here seeks to detect mortality patterns that might reflect changes to ecosystem processes at large scales. In many cases, the proximate cause of mortality may be discernable. Understanding proximate causes of mortality may...AuthorsMark J. AmbroseSourceGen. Tech. Rep. SRS-250. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research StationYear2020
- The Forest Health Monitoring (FHM) national program of the U.S. Department of Agriculture Forest Service determines status, changes, and trends in indicators of forest condition across all forested lands (ch. 1). One of the central objectives of the FHM annual national reports is to present forest health indicator information from a national perspective, or from a multi-State regional perspective when appropriate, using data collected by the Forest Health Protection (FHP) and Forest Inventory and Analysis (FIA) programs of the Forest Service, as well as from other sources. A standing...AuthorsKevin M. Potter, Julie C. Canavin, Frank H. H. KochSourceGen. Tech. Rep. SRS-250. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research StationYear2020
- Remote sensing’s role in forest monitoring is evolving. Satellite imagery is now systematically used to recognize and track forest disturbances in near-real time (Brown and others 2008, Chastain and others 2015, Hargrove and others 2009, Spruce and others 2011) and for retrospective insights (Meddens and others 2012, Norman and others 2016, Vogelmann and others 2012). Apart from mapping disturbance, high-frequency satellite data provide a reliable way to track vegetation phenology (Hargrove and others 2009, Norman and others 2017), and as vegetation phenology is an important indicator of...AuthorsSteve P. Norman, Bill ChristieSourceGen. Tech. Rep. SRS-250. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research StationYear2020
- When analyzing environmental samples for DNA from multiple taxa, researchers must usually decide between iterative analyses with single-taxon assays - which are reliable and sensitive, but also laborious to apply - and approaches such as metabarcoding that can simultaneously target multiple species, but which are less sensitive for detection across taxa. Here, we test an intermediate approach that allows efficient, parallel assessment of taxon-specific qPCR assays via high-throughput quantitative PCR (HT-qPCR). Based on an assessment of over 500 environmental samples, we found that...AuthorsTaylor Wilcox, Kevin S. McKelvey, Michael K. Young, Cory L. Engkjer, Richard F. Lance, Andrew Lahr, Lisa A. Eby, Michael K. SchwartzKeywordsSourceEnvironmental DNA. doi: 10.1002/edn3.80.Year2020
- In 2015, researchers from the U.S. Department of Agriculture Forest Service, Rocky Mountain Research Station, Human Dimensions Program (hereafter U.S. Forest Service), and the University of Có\ordoba, Forest Engineering Department, Forest Fire Laboratory, Spain (hereafter University of Cordoba), entered into an official Memorandum of Understanding (MOU). The primary objective of the MOU is to jointly develop strategic fire planning models and decision support systems to promote cost-effective and efficient fuels and fire management. The broader goals of the research are to enhance firefight...AuthorsFrancisco Rodriguez y Silva, Juan Ramon Molina Martinez, Matthew P. Thompson, Christopher D. O'ConnorKeywordsSourceCordoba, Spain: University of Cordoba, Forest Engineering Department, Forest Fire Laboratory. 47 p.Year2020