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The effects of precipitation variability on C4 photosynthesis, net primary production and soil respiration in a Chihuahuan Desert grassland

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/21084

The effects of precipitation variability on C4 photosynthesis, net primary production and soil respiration in a Chihuahuan Desert grassland

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dc.contributor.author Thomey, Michell
dc.date.accessioned 2012-08-28T18:18:00Z
dc.date.available 2012-08-28T18:18:00Z
dc.date.issued 2012-08-28
dc.date.submitted May 2012
dc.identifier.uri http://hdl.handle.net/1928/21084
dc.description.abstract Although the Earth’s climate system has always been inherently variable, the magnitude and rate of anthropogenic climate change is subjecting ecosystems and the populations that they contain to novel environmental conditions. Because water is the most limiting resource, arid-semiarid ecosystems are likely to be highly responsive to future climate variability. The goal of my dissertation is to understand how precipitation variability affects primary productivity and soil respiration in desert grassland ecosystems. Initially, I reviewed the literature to understand how climate change affects net ecosystem exchange (NEE) across the warm deserts of North America (Chapter 2). Next, I examined the effects of precipitation frequency and intensity on soil moisture (θ), leaf-level photosynthesis (Anet), predawn leaf water potential (Ψpd), aboveground net primary productivity (ANPP), and soil respiration (Rs) (Chapter 3). Last, I studied how large (10 mm) and extreme (30 mm) rainfall events with extended dry periods affected the ecophysiological response of two co-occurring dominant perennial C4 grasses, Bouteloua eriopoda and B. gracilis across an arid-semiarid ecotone (Chapter 4). en_US
dc.description.sponsorship National Science Foundation grant to the University of New Mexico (UNM) for Long-Term Ecological Research (LTER), U.S. Department of Energy's Office of Science (BER) through the Western Regional Center for the National Institute for Climatic Change Research, T&E Inc., Sevilleta LTER Summer Fellowship, UNM Department of Biology Alumni Scholarships, UNM - Graduate Research Allocations Committee, Student Research Allocations Committee, Graduate Research Project and Travel Grant en_US
dc.language.iso en_US en_US
dc.subject Precipitation variability en_US
dc.subject Chihuahuan Desert grassland en_US
dc.subject Primary production en_US
dc.subject Soil respiration en_US
dc.subject Bouteloua eriopoda en_US
dc.subject Bouteloua gracilis en_US
dc.subject.lcsh Precipitation variability--Environmental aspects.
dc.subject.lcsh Climate changes--Environmental aspects.
dc.subject.lcsh Primary productivity (Biology)
dc.subject.lcsh Soil respiration.
dc.subject.lcsh Grassland ecology.
dc.subject.lcsh Desert ecology.
dc.subject.lcsh Ecophysiology.
dc.subject.lcsh Black grama grass--Ecology.
dc.subject.lcsh Blue grama grass--Ecology.
dc.title The effects of precipitation variability on C4 photosynthesis, net primary production and soil respiration in a Chihuahuan Desert grassland en_US
dc.type Dissertation en_US
dc.description.degree Doctor of Philosophy en_US
dc.description.level Doctoral en_US
dc.description.department University of New Mexico. Biology Dept. en_US
dc.description.advisor Collins, Scott
dc.description.committee-member Pockman, William
dc.description.committee-member Sinsabaugh, Robert
dc.description.committee-member Nippert, Jesse


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