Treesearch
Displaying 19,141 - 19,150 of 65,202 Publications- Greater sage-grouse (Centrocercus urophasianus, hereafter "sage-grouse") have experienced range-wide population declines for several decades, and as a result they were considered warranted for listing under the Endangered Species Act in 2010. Therefore, wildlife managers need to understand how sage-grouse breeding behavior influences long-term reproductive success, and should be able to accurately relate sage-grouse lek count data to population sizes. Behavior during the breeding season, such as how frequently males visit their leks or move among leks, could relate to a male sage-grouse’s...AuthorsAleshia Lynn FremgenKeywordsSourceColumbia, MO: University of Missouri-Columbia. 139 p. Thesis.Year2014
- The Forest and Rangeland Renewable Resources Planning Act (RPA) of 1974 calls for a periodic assessment of the Nation's renewable resources. The Forest Inventory and Analysis (FIA) program of the U.S. Forest Service supports the RPA effort by providing information on the forest resources of the United States. The RPA tree-level database (RPAtreeDB) was generated from the FIA database to facilitate the reporting of forest estimates and their associated sampling errors for the most recent RPA forest resource report (Oswalt et al. 2014). The RPAtreeDB contains plot- and tree-level data,...AuthorsPatrick D. Miles, Scott A. Pugh, Brad Smith, Sonja OswaltKeywordsSourceIn: Oswalt, S.N.; Smith, W. Brad; Miles, Patrick D.; Pugh, Scott A. Forest resources of the United States, 2012: a technical document supporting the Forest Service 2015 update of the RPA assessment. Gen. Tech. Rep. WO-91. Washington DC: U.S. Department of Agriculture, Forest Service, Washington Office. 40 p.Year2014
- Large-scale tree planting projects in cities are increasingly implemented as a strategy to improve the urban environment. Trees provide multiple benefits in cities, including reduction of urban temperatures, improved air quality, mitigation of storm-water run-off, and provision of wildlife habitat. How urban afforestation affects the properties and functions of urban soils, however, is largely unknown. As healthy soils are critical for vigorous tree growth, our study explores the impact of soil restoration as part of a large-scale urban afforestation project. We collected data on multiple...AuthorsEmily E. Oldfield, Alexander J. Felson, Stephen A. Wood, Richard Hallett, Michael S. Strickland, Mark A. BradfordKeywordsSourceForest Ecology and Management. 313: 266-273.Year2014
- Forested ecosystems are threatened by invasive pests, pathogens, and unusual climatic events brought about by climate change. Earlier detection of incipient forest health problems and a quantitatively rigorous assessment method is increasingly important. Here, we describe a method that is adaptable across tree species and stress agents and practical for use in the field. This approach relies on: (1) measurements covering a range of forest decline symptoms, from early decline to imminent death, (2) normalization of each measurement within each species’ natural range, and (3) combining...AuthorsJennifer Pontius, Richard HallettKeywordsSourceForest Science. 60(6): 1156-1163.Year2014
- Leaf hydraulics, gas exchange and carbon storage in Pinus edulis and Juniperus monosperma, two tree species on opposite ends of the isohydry–anisohydry spectrum, were analyzed to examine relationships between hydraulic function and carbohydrate dynamics. Leaf hydraulic vulnerability, leaf water potential (Ψl), leaf hydraulic conductance (Kleaf), photosynthesis (A), stomatal conductance (gs) and nonstructural carbohydrate (NSC) content were analyzed throughout the growing season. Leaf hydraulic vulnerability was significantly lower in the relatively anisohydric J. monosperma than in the...AuthorsDavid R. Woodruff, Frederick Meinzer, Danielle E. Marias, Sanna Sevanto, Michael W. Jenkins, Nate G. McDowellKeywordsSourceNew PhytologistYear2014
- Despite the critical role that phloem plays in a number of plant functional processes and the potential impact of water stress on phloem structural and phloem sap compositional characteristics, little research has been done to examine how water stress influences phloem transport. The objectives of this study were to develop a more accurate understanding of how water stress affects phloem transport in trees, both in terms of the short-term impacts of water stress on phloem sap composition and the longer-term impacts on sieve cell anatomical characteristics. Phloem sieve cell conductivity...AuthorsDavid WoodruffKeywordsSourceTree PhysiologyYear2014
- Plant pathogenic fungi are a large and diverse assemblage of eukaryotes with substantial impacts on natural ecosystems and human endeavours. These taxa often have complex and poorly understood life cycles, lack observable, discriminatory morphological characters, and may not be amenable to in vitro culturing. As a result, species identification is frequently difficult. Molecular (DNA sequence) data have emerged as crucial information for the taxonomic identification of plant pathogenic fungi, with the nuclear ribosomal internal transcribed spacer (ITS) region being the most popular marker.AuthorsR. Henrik Nilsson, Kevin Hyde, Julia Pawłowska, Martin Ryberg, Leho Tedersoo, Anders Bjørnsgard Aas, Siti A. Alias, Artur Alves, Cajsa Lisa Anderson, Alexandre Antonelli, A. Elizabeth Arnold, Barbara Bahnmann, Mohammad Bahram, Johan Bengtsson-Palme, Anna Berlin, Sara Branco, Putarak Chomnunti, Asha Dissanayake, Rein Drenkhan, Hanna Friberg, Tobias Guldberg Frøslev, Bettina Halwachs, Martin Hartmann, Beatrice Henricot, Ruvishika Jayawardena, Ari Jumpponen, Håvard Kauserud, Sonja Koskela, Tomasz Kulik, Kare Liimatainen, Björn D. Lindahl, Daniel Lindner, Jian-Kui Liu, Sajeewa Maharachchikumbura, Dimuthu Manamgoda, Svante Martinsson, Maria Alice Neves, Tuula Niskanen, Stephan Nylinder, Olinto Liparini Pereira, Danilo Batista Pinho, Teresita M. Porter, Valentin Queloz, Taavi Riit, Marisol Sánchez-García, Filipe de Sousa, Emil Stefańczyk, Mariusz Tadych, Susumu Takamatsu, Qing Tian, Dhanushka Udayanga, Martin Unterseher, Zheng Wang, Saowanee Wikee, Jiye Yan, Ellen Larsson, Karl-Henrik Larsson, Urmas Kõljalg, Kessy AbarenkovKeywordsSourceFungal DiversityYear2014
- White-nose syndrome is a fungal disease that has decimated bat populations across eastern North America. Identification of the etiologic agent, Pseudogymnoascus destructans (formerly Geomyces destructans), in environmental samples is essential to proposed management plans. A major challenge is the presence of closely related species, which are ubiquitous in many soils and cave sediments and often present in high abundance. We present a dual-probe real-time quantitative PCR assay capable of detecting and differentiating P. destructans from closely related fungi in environmental samples from...AuthorsM. M. Shuey, K. P. Drees, Daniel Lindner, P. Keim, J. T. FosterKeywordsSourceApplied and Environmental MicrobiologyYear2014
- Use of wood biomass for energy results in carbon (C) emissions at the time of burning and alters C stocks on the land because of harvest, regrowth, and changes in land use or management. This study evaluates the potential effects of expanded woody biomass energy use (for heat and power) on net C emissions over time. A scenario with increased wood energy use is compared with a dynamic business-as-usual scenario where wood energy use is driven by its historical relationship with gross domestic product. At the national level, we projected that up to 78% of increased cumulative C emissions...AuthorsPrakash Nepal, David N. Wear, Kenneth E. SkogKeywordsSourceGCB BioenergyYear2014
- With the transport of plants around the globe, exotic species can readily spread disease to their native relatives; however, they can also provide genetic resistance to those relatives through hybrid breeding programmes. American chestnut (Castanea dentata) was an abundant tree species in North America until its decimation by introduced chestnut blight. To restore chestnut in North America, efforts are ongoing to test putative blight-resistant hybrids of Castanea dentata and Chinese chestnut (Castanea mollissima), but little is known about the ecology of C. mollissima. In a forest in...AuthorsAmy C. Miller, Keith Woeste, Sandra L. Anagnostakis, Doutlass F. JacobsKeywordsSourceAoB PLANTS. 6(0). doi: 10.1093/aobpla/plu065. 16 p.Year2014