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Interspecific Competition and Resource Pulse Utilization in a Cold Desert Community

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James R Ehleringer, and Susanne Schwinning, Interspecific Competition and Resource Pulse Utilization in a Cold Desert Community: .

Summary

In desert ecosystems a large proportion of water and nitrogen is supplied in rain-induced pulses. It has been suggested that competitive interactions among desert plants would be most intense during these pulse periods of high resource availability. We tested this hypothesis with three cold desert shrub species of the Colorado Plateau (Gutierrezia sarothrae, Atriplex confertifolia, and Chrysothamnus nauseosus), which differ in their distribution of functional roots. In a three-year field study we conducted a neighbor removal experiment in conjunction with simulated 25-mm precipitation events and the addition of a nitrogen pulse in either spring or summer. We measured predawn water potential (Ψ), gas exchange, leaf δ15N, carbon isotope [...]

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  • Upper Colorado River Basin

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From Source - Mendeley RIS export <br> On - Tue May 10 11:59:29 CDT 2011

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Title Citation Interspecific Competition and Resource Pulse Utilization in a Cold Desert Community

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