Latitudinal trends of leaf caloric values at the species, plant functional group (PFG), and community levels in Chinese forests.

LCVT, LCVs, and LCVH, the average of leaf caloric value for the relative leaf biomass of trees, shrubs, and herbs, respectively. Only significant regression (p < 0.05) is given. *, p < 0.05; **, p < 0.01.