Growing-Season Precipitation Is a Key Driver of Plant Leaf Area to Sapwood Area Ratio at the Global Scale.

Leaf area to sapwood area ratio (A/A) influences carbon sequestration, community composition, and ecosystem functioning in terrestrial vegetation and is closely related to leaf economics and hydraulics. However, critical predictors of A/A are not well understood. We compiled an A/A data set with 1612 species-site combinations (1137 species from 285 sites worldwide) from our field experiments and published literature.