A tool for estimating impacts of woody encroachment in arid grasslands: Allometric equations for biomass,carbon and nitrogen content in Prosopis velutina |
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| Institution: | 1. School of Natural Resources and the Environment, University of Arizona, Tucson, AZ 8721, USA;2. P.O. Box 194, Trimont, MN 56176, USA;1. Sustainability Research Centre, University of the Sunshine Coast, Sippy Downs, Queensland 4556, Australia;2. Commonwealth Scientific and Industrial Research Organisation (CSIRO) Land and Water, Townsville, QLD 4814, Australia;3. CSIRO Land and Water, GPO Box 2583, Brisbane, Queensland 4001, Australia;4. CSIRO Land and Water, GPO Box 1700, Canberra, Australian Capital Territory 2601, Australia;5. School of Health and Sport Sciences, University of the Sunshine Coast, Sippy Downs, Queensland 4556, Australia;1. School of Biological Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia;2. School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand;3. School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand;4. Department of Physics, Brown University, Providence, RI 02912-1843, USA;1. Laboratorio de Química, Universidad de Piura, Av. Ramón Mugica 131, Piura, Perú;2. Dpto. Ingeniería Forestal, Laboratorio de Dendrocronología y cambio climático, DendrodatLab- ERSAF, Universidad de Córdoba, Campus de Rabanales, 14071 Córdoba, Spain;3. Área de Ecología, Universidad de Córdoba, Edificio Celestino Mutis, Campus de Rabanales, 14071 Córdoba, Spain;1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;2. Department of Ecology, College of Urban and Environment, Key Laboratory of Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China;1. Southwest Watershed Research Center, Agricultural Research Service, Tucson, AZ 85719, USA;2. Earth and Ecosystem Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, USA;3. Department of Biology, University of New Mexico, Albuquerque, NM, 87131, USA;4. U.S. Geological Survey, Nevada Water Science Center, Henderson, NV, 89074, USA;5. School of Natural Resources and the Environment, University of Arizona, Tucson, AZ, 85721, USA;6. School of Earth and Space Exploration, Arizona State University, Tempe, AZ, 85287, USA;7. School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, 85287, USA;8. Department of Geology Wayne State University - Detroit, MI |
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| Abstract: | Regression equations were developed to estimate above ground biomass and carbon and nitrogen mass of foliage and stem size fractions from plant size dimensions (basal diameter, canopy area, height, canopy volume) for a tall shrub species (Prosopis velutina) that has increased in abundance in arid and semi-arid grasslands in the southwestern United States and northwestern Mexico. Regression equations were also developed to describe relationships among the dimensions of plant size. All equations were significant (p < 0.001); and all but two had r2 values >0.72. In addition to species-specific information, we found support for the global patterns of foliar biomass increasing to the ¾ power of stem biomass and height increasing to the ½ power of stem diameter. We provide a comprehensive report of all equations, which can support a variety of in situ (ground-based), modeling, and remote-sensing objectives related to quantifying changes in ecosystem function and carbon sequestration accompanying changes in woody plant abundance. We advocate that comprehensive reporting should become more common for arid and semi-arid woody species in order to support a broad spectrum of users while laying the foundation for the development of global generalizations similar to those available for forest trees. |
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