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- W1954686872 abstract "Values (Δ(i)) predicted by a simplified photosynthetic discrimination model, based only on diffusion through air followed by carboxylation, are often used to infer ecological conditions from the ¹³C signature of plant organs (δ¹³C(p)). Recent studies showed that additional isotope discrimination (d that includes mesophyll conductance, photorespiration and day respiration, and post-carboxylation discrimination) can strongly affect δ¹³C(p); however, little is known about its variability during plant ontogeny for different species. Effect of ontogeny on leaf gas exchange rates, Δ(i) , observed discrimination (Δ(p)) and d in leaf, phloem and root of seven herbaceous species at three ontogenetic stages were investigated under controlled conditions. Functional group identity and ontogeny significantly affected Δ(i) and Δ(p). However, predicted Δ(i) did not match Δ(p). d, strongly affected by functional group identity and ontogeny, varied by up to 14 ‰. d scaled tightly with stomatal conductance, suggesting complex controls including changes in mesophyll conductance. The magnitude of the changes in δ¹³C(p) due to ontogeny was similar to that due to environmental factors reported in other studies. d and ontogeny should, therefore, be considered in ecosystem studies, integrated in ecosystem models using δ¹³C(p) and limit the applicability of δ¹³C(leaf) as a proxy for water-use efficiency in herbaceous plants." @default.
- W1954686872 created "2016-06-24" @default.
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- W1954686872 date "2011-01-14" @default.
- W1954686872 modified "2023-09-23" @default.
- W1954686872 title "Ontogeny and leaf gas exchange mediate the carbon isotopic signature of herbaceous plants" @default.
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- W1954686872 doi "https://doi.org/10.1111/j.1365-3040.2010.02256.x" @default.
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