The influence of species and growing conditions on the 18-O enrichment of leaf water and its impact on 'effective path length'
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 2106221
Author(s) Kahmen, Ansgar; Simonin, Kevin; Tu, Kevin; Goldsmith, Gregory R.; Dawson, Todd E.
Author(s) at UniBasel Kahmen, Ansgar
Year 2009
Title The influence of species and growing conditions on the 18-O enrichment of leaf water and its impact on 'effective path length'
Journal New Phytologist
Volume 184
Number 3
Pages / Article-Number 619-630
Abstract The stable oxygen isotope ratio (delta(18)O) of plant material has been shown to contain essential information on water and carbon fluxes at the plant and ecosystem scales. However, the effective path length (L(m)), a parameter introduced to leaf-water models still requires a comprehensive biological characterization to allow interpretation of delta(18)O values in plant material with confidence. Here, we tested the variability of L(m) across and within three species that developed leaves in environments with different relative humidity. We also tested whether the L(m) of fully developed leaves is affected by short-term fluctuations in relative humidity. We determined that significant differences in L(m) exist among Phaseolus vulgaris, Rizinus communis and Helianthus annuus. Within a given species, however, L(m) values did not differ significantly among individuals. These findings indicate that L(m) is species specific and a relatively constant parameter and that L(m) will not obscure the interpretation of delta(18)O values in plant material of a given species. We urge caution, however, because values for L(m) are derived from fitting leaf-water models to measured values of delta(18)O, so care must be taken in assigning a 'cause' to values of L(m) as they likely capture a combination of different biological leaf properties.
Publisher Wiley
ISSN/ISBN 0028-646X ; 1469-8137
edoc-URL http://edoc.unibas.ch/49361/
Full Text on edoc No
Digital Object Identifier DOI 10.1111/j.1469-8137.2009.03008.x
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/19761496
ISI-Number WOS:000270902200011
Document type (ISI) Article
 
   

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