Estimating intra-seasonal photosynthetic discrimination and water use efficiency using δ13C of leaf sucrose in Scots pine.

Comparing δ 13 C values Chamber-derived and modeled δ 13 C A δ 13 C A_Picarro and δ 13 C A_model shared a similar seasonal pattern, with an increasing trend in the first half of May, a gradual decline from mid-May to early July, and a declining trend from August until the end of the growing season ( Fig. 2A ).

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