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- W2113643012 abstract "ABSTRACT Current models of leaf water enrichment predict that the differences between isotopic enrichment of water at the site of evaporation (Δ e ) and mean lamina leaf water enrichment (Δ L ) depend on transpiration rates ( E ), modulated by the scaled effective length ( L ) of water isotope movement in the leaf. However, variations in leaf parameters in response to changing environmental conditions might cause changes in the water path and thus L . We measured the diel course of Δ L for 18 O and 2 H in beech seedlings under well‐watered and water‐limited conditions. We applied evaporative enrichment models of increasing complexity to predict Δ e and Δ L , and estimated L from model fits. Water‐limited plants showed moderate drought stress, with lower stomatal conductance, E and stem water potential than the control. Despite having double E , the divergence between Δ e and Δ L was lower in well‐watered than in water‐limited plants, and thus, L should have changed to counteract differences in E . Indeed, L was about threefold higher in water‐limited plants, regardless of the models used. We conclude that L changes with plant water status far beyond the variations explained by water content and other measured variables, thus limiting the use of current evaporative models under changing environmental conditions." @default.
- W2113643012 created "2016-06-24" @default.
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- W2113643012 date "2009-09-07" @default.
- W2113643012 modified "2023-10-15" @default.
- W2113643012 title "Effect of water availability on leaf water isotopic enrichment in beech seedlings shows limitations of current fractionation models" @default.
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- W2113643012 doi "https://doi.org/10.1111/j.1365-3040.2009.01996.x" @default.
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