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The enigma of effective path length for (18) O enrichment in leaf water of conifers
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 3315532
Author(s) Roden, John; Kahmen, Ansgar; Buchmann, Nina; Siegwolf, Rolf
Author(s) at UniBasel Kahmen, Ansgar
Year 2015
Title The enigma of effective path length for (18) O enrichment in leaf water of conifers
Journal Plant, cell & environment
Volume 38
Number 12
Pages / Article-Number 2551-2565
Abstract The Péclet correction is often used to predict leaf evaporative enrichment and requires an estimate of effective path length (L). Studies to estimate L in conifer needles have produced unexpected patterns based on Péclet theory and leaf anatomy. We exposed seedlings of six conifer species to different vapour pressure deficits (VPD) in controlled climate chambers to produce steady-state leaf water enrichment (in (18) O). We measured leaf gas exchange, stable oxygen isotopic composition (δ(18) O) of input and plant waters as well as leaf anatomical characteristics. Variation in bulk needle water δ(18) O was strongly related to VPD. Conifer needles had large amounts of water within the vascular strand that was potentially unenriched (up to 40%). Both standard Craig-Gordon and Péclet models failed to accurately predict conifer leaf water δ(18) O without taking into consideration the unenriched water in the vascular strand and variable L. Although L was linearly related to mesophyll thickness, large within-species variation prevented the development of generalizations that could allow a broader use of the Péclet effect in predictive models. Our results point to the importance of within needle water pools and isolating mechanisms that need further investigation in order to integrate Péclet corrections with 'two compartment' leaf water concepts.
Publisher Blackwell
ISSN/ISBN 0140-7791
Full Text on edoc No
Digital Object Identifier DOI 10.1111/pce.12568
PubMed ID
ISI-Number WOS:000365794900007
Document type (ISI) Article

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