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Water use efficiency and carbon isotope composition of plants in a cold desert environment

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The effects of the availabilities of water and nitrogen on water use efficiency (WUE) of plants were investigated in a sagebrush steppe. The four species studied wereArtemisia tridentata (shrub),Ceratoides lanata (suffrutescent shrub),Elymus lanceolatus (rhizomatous grass), andElymus elymoides (tussock grass). Water and nitrogen levels were manipulated in a two-by-two factorial design resulting in four treatments: control (no additions), added water, added nitrogen, and added water and nitrogen. One instantaneous and two long-term indicators of WUE were used to testa priori predictions of the ranking of WUE among treatments. The short-term indicator was the instantaneous ratio of assimilation to transpiration (A/E). The long-term measures were 1) the slope of the relationship between conductance to water vapor and maximum assimilation and 2) the carbon isotope composition (δ13C) of plant material. Additional water decreased WUE, whereas additional nitrogen increased WUE. For both A/E and δ13C, the mean for added nitrogen alone was significantly greater than the mean for added water alone, and means for the control and added water and nitrogen fell in between. This ranking of WUE supported the hypothesis that both water and nitrogen limit plant gas exchange in this semiarid environment. The short- and long-term indicators were in agreement, providing evidence in support of theoretical models concerning the water cost of carbon assimilation.

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Authors and Affiliations

  1. Department of Biological Sciences, Idaho State University, 83209, Pocatello, ID, USA

    Nancee L. Toft & Jay E. Anderson

  2. Department of Range, Wildilife and Forestry, University of Nevada, 89512, Reno, NV, USA

    Robert S. Nowak

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  1. Nancee L. Toft
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  2. Jay E. Anderson
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  3. Robert S. Nowak
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Toft, N.L., Anderson, J.E. & Nowak, R.S. Water use efficiency and carbon isotope composition of plants in a cold desert environment. Oecologia 80, 11–18 (1989). https://doi.org/10.1007/BF00789925

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  • DOI: https://doi.org/10.1007/BF00789925

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