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Carbon isotope discrimination in three semi-arid woodland species along a monsoon gradient

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Williams, David G, and Ehleringer, James R, Carbon isotope discrimination in three semi-arid woodland species along a monsoon gradient: .

Summary

Leaf carbonisotope discrimination (?) was measured for three dominant, semi-arid woodland species along a summer monsoon gradient inthe southwestern United States over a 2-year period. We tested the hypothesis that decreased humidity levels during the growing season along this gradient resulted in lower leaf ? values. Sites of similar elevation along the transect were selected and the range in monsoon contribution to overall annual precipitation varied from 18 to 58%, while total annual precipitation differed by a maximum of only 25% across this gradient. Leaf ? values in Quercus gambelii were negatively correlated with ?, a seasonally-weighted estimate of the evaporative humidity gradient, suggesting that stomatal conductance declined [...]

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From Source - Mendeley RIS Export <br> On - Wed Sep 19 08:08:31 MDT 2012

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Title Citation Carbon isotope discrimination in three semi-arid woodland species along a monsoon gradient

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