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To explore the latitudinal variation of stomatal traits from species to community level and their linkage with net primary productivity (NPP), we investigated leaf stomatal density (SD L ) and stomatal length (SL L ) across 760 species from nine forest ecosystems in eastern China, and calculated the community-level SD (SD C ) and SL (SL C ) through species-specific leaf area index (LAI). Our results showed that latitudinal variation in species-level SD L  and SL L  was minimal, but community-level SD C  and SL C  decreased clearly with increasing latitude. The relationship between SD and SL was negative across species and different plant functional types (PFTs), but positive at the community level. Furthermore, community-level SD C  correlated positively with forest NPP, and explained 51% of the variation in NPP. These findings indicate that the trade-off by regulating SD L  and SL L  may be an important strategy for plant individuals to adapt to environmental changes, and temperature acts as the main factor influencing community-level stomatal traits through alteration of species composition. Importantly, our findings provide new insight into the relationship between plant traits and ecosystem function.

Latitudinal variation of leaf stomatal traits from species to community level in forests: linkage with ecosystem productivity