Carbon isotope discrimination in three semi-arid woodland species along a monsoon gradient.
In: Oecologia, Jg. 106 (1996-06-01), Heft 4, S. 455-460
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Zugriff:
Leaf carbonisotope discrimination (Δ) 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 Δ 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 Δ values in Quercus gambelii were negatively correlated with ϖ, a seasonally-weighted estimate of the evaporative humidity gradient, suggesting that stomatal conductance declined as transpiration potential increased. For two other trees that co-occurred along this gradient, Pinus edulis and Juniperus osteosperma, Δ remained relatively constant despite large variation in ϖ. These woodland species represent the full spectrum of responses of carbon isotope discrimination to increases in evaporative potential; that of decline where c/ c(ratio of internal to ambient CO concentration) and presumably stomatal conductance decrease, and that of constancy where whole plant internal adjustments allow c/ cto remain stable. [ABSTRACT FROM AUTHOR]
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Titel: |
Carbon isotope discrimination in three semi-arid woodland species along a monsoon gradient.
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Autor/in / Beteiligte Person: | Williams, David ; Ehleringer, James |
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Zeitschrift: | Oecologia, Jg. 106 (1996-06-01), Heft 4, S. 455-460 |
Veröffentlichung: | 1996 |
Medientyp: | academicJournal |
ISSN: | 0029-8549 (print) |
DOI: | 10.1007/BF00329701 |
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