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Estimation of intrinsic water-use efficiency from δ13C signature of C3 leaves: Assumptions and uncertainty
Ist Teil von
Frontiers in plant science, 2023-01, Vol.13, p.1037972-1037972
Ort / Verlag
Frontiers Media S.A
Erscheinungsjahr
2023
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Carbon isotope composition (δ
13
C) has been widely used to estimate the intrinsic water-use efficiency (iWUE) of plants in ecosystems around the world, providing an ultimate record of the functional response of plants to climate change. This approach relies on established relationships between leaf gas exchange and isotopic discrimination, which are reflected in different formulations of
13
C-based iWUE models. In the current literature, most studies have utilized the simple, linear equation of photosynthetic discrimination to estimate iWUE. However, recent studies demonstrated that using this linear model for quantitative studies of iWUE could be problematic. Despite these advances, there is a scarcity of review papers that have comprehensively reviewed the theoretical basis, assumptions, and uncertainty of
13
C-based iWUE models. Here, we 1) present the theoretical basis of
13
C-based iWUE models: the classical model (iWUE
sim
), the comprehensive model (iWUE
com
), and the model incorporating mesophyll conductance (iWUE
mes
); 2) discuss the limitations of the widely used iWUE
sim
model; 3) and make suggestions on the application of the iWUE
mes
model. Finally, we suggest that a mechanistic understanding of mesophyll conductance associated effects and post-photosynthetic fractionation are the bottlenecks for improving the
13
C-based estimation of iWUE.