Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 97, Issue 14, Pages 7894-7898Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.97.14.7894
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We show that O-18 evaporative enrichment of bulk leaf water in grass species can be significantly more enriched than predicted by the Craig-Cordon model, with C-4 grasses considerably more enriched than Cs grasses. Our results suggest that the unanticipated O-18 leaf water enrichment of grasses is attributable to the progressive evaporative enrichment along parallel veins (a function of both leaf length and interveinal distance), a pattern that does not occur in Dicotyledonous species. We propose that the differential O-18 enrichment of grasses will result in distinct (COO)-O-18-O-16 biospheric signals from grassland and forest ecosystems, allowing for further partitioning of terrestrial carbon fluxes.
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