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In deciduous trees, the δ 13 C values of leaves are known to diverge during growth from those of woody organs. The main purpose of this study is to determine whether the divergence in δ 13 C between leaves and current-year twigs of  Fagus sylvatica  (L.) is influenced by changes (i) in the relative contents of organic matter fractions and (ii) in the δ 13 C of respired CO 2 . The δ 13 C values of bulk matter, extractive-free matter, lignin, holocellulose, starch, soluble sugars, water-soluble fraction and respired CO 2 , as well as their relative contents in bulk matter were determined. The δ 13 C values of biochemical fractions and respired CO 2  showed very similar temporal variations for both leaves and twigs. Variations in bulk matter δ 13 C during growth were, therefore, poorly explained by changes in biochemical composition or in respiratory fractionation and were attributed to the transition from  13 C-enriched reserves (mainly starch) to  13 C-depleted new photoassimilates. The divergence between leaves and twigs was related to higher values of soluble sugar δ 13 C in twigs. However, the difference between lignin and holocellulose δ 13 C varied during growth. This phenomenon was attributed to the delay between holocellulose and lignin deposition. These results may have implications for analysis of organic matter δ 13 C in trees and forest ecosystems.

Leaf and twig δ 13 C during growth in relation to biochemical composition and respired CO 2