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dc.contributor.authorThomey, Michell
dc.date.accessioned2012-08-28T18:18:00Z
dc.date.available2012-08-28T18:18:00Z
dc.date.issued2012-08-28
dc.date.submittedMay 2012
dc.identifier.urihttp://hdl.handle.net/1928/21084
dc.description.abstractAlthough 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.sponsorshipNational 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 Granten_US
dc.language.isoen_USen_US
dc.subjectPrecipitation variabilityen_US
dc.subjectChihuahuan Desert grasslanden_US
dc.subjectPrimary productionen_US
dc.subjectSoil respirationen_US
dc.subjectBouteloua eriopodaen_US
dc.subjectBouteloua gracilisen_US
dc.subject.lcshPrecipitation variability--Environmental aspects.
dc.subject.lcshClimate changes--Environmental aspects.
dc.subject.lcshPrimary productivity (Biology)
dc.subject.lcshSoil respiration.
dc.subject.lcshGrassland ecology.
dc.subject.lcshDesert ecology.
dc.subject.lcshEcophysiology.
dc.subject.lcshBlack grama grass--Ecology.
dc.subject.lcshBlue grama grass--Ecology.
dc.titleThe effects of precipitation variability on C4 photosynthesis, net primary production and soil respiration in a Chihuahuan Desert grasslanden_US
dc.typeDissertationen_US
dc.description.degreeDoctor of Philosophyen_US
dc.description.levelDoctoralen_US
dc.description.departmentUniversity of New Mexico. Biology Dept.en_US
dc.description.advisorCollins, Scott
dc.description.committee-memberPockman, William
dc.description.committee-memberSinsabaugh, Robert
dc.description.committee-memberNippert, Jesse


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