Photosynthetic rate dominates the seasonal variation of tree intrinsic water-use efficiency in the humid East Asian Monsoon region.

Tree Physiol · 2026 · PMC13252599 · PMID 42059648

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highly significantno p-value reported

At the seasonal scale, this study also found a highly significant positive correlation between atmospheric CO 2 concentration ( C a ) and iWUE ( Figure 4 ; Table S2 available as Supplementary Data at Tree Physiology Online).

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an increasing trendno p-value reported

Globally, tree-ring δ 13 C chronologies have consistently shown an increasing trend in iWUE over recent decades ( Mathias and Thomas 2021 ).

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