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Deuterium enriched irrigation indicates different forms of rain use in shrub/grass species of the Colorado Plateau

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Schwinning, Susanne, Davis, Kim, Richardson, Leah, and Ehleringer, James R, Deuterium enriched irrigation indicates different forms of rain use in shrub/grass species of the Colorado Plateau: .

Summary

We contrasted the seasonal use of simulated large rain events (24 mm) by three native species of the arid Colorado Plateau: the perennial grass Hilaria jamesii and two shrubs Artemesia filifolia and Coleogyne ramosissima. Deuterium-enriched water was used to distinguish shallow "pulse" water from water in deeper soil layers that were unaffected by the water input. We also measured the leaf gas exchange rates of watered and unwatered control plants for 5 days after the rain event. H. jamesii had twice the pulse water proportion in its xylem than the two shrubs in spring (approx. 70% vs 35%). In summer, the pulse water proportions of all species were around 70%. The increase in the relative pulse water uptake of the two shrubs was caused [...]

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  • Upper Colorado River Basin

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From Source - Mendeley RIS Export <br> On - Wed Sep 19 08:12:57 MDT 2012

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Title Citation Deuterium enriched irrigation indicates different forms of rain use in shrub/grass species of the Colorado Plateau

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