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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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Title: The effects of precipitation variability on C4 photosynthesis, net primary production and soil respiration in a Chihuahuan Desert grassland
Author: Thomey, Michell
Advisor(s): Collins, Scott
Committee Member(s): Pockman, William
Sinsabaugh, Robert
Nippert, Jesse
Department: University of New Mexico. Biology Dept.
Subject(s): Precipitation variability
Chihuahuan Desert grassland
Primary production
Soil respiration
Bouteloua eriopoda
Bouteloua gracilis
LC Subject(s): Precipitation variability--Environmental aspects.
Climate changes--Environmental aspects.
Primary productivity (Biology)
Soil respiration.
Grassland ecology.
Desert ecology.
Ecophysiology.
Black grama grass--Ecology.
Blue grama grass--Ecology.
Degree Level: Doctoral
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).
Graduation Date: May 2012
URI: http://hdl.handle.net/1928/21084

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