Drone-based physiological index reveals long-term acclimation and drought stress responses in trees.

For instance, leaf‐level gas exchange measurements for the trees around the scaffolds suggest that irrigation‐stop trees tended to have higher photosynthesis and stomatal conductance levels than control trees, although these differences were only marginally significant in summer 2020 ( p ≤ .1; Figure S3 e,k).

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