[Effects of growth stage and altitude on twig functional traits and biomass allocation of in the headwater region of Minjiang River, China].

This study aimed at understanding the differences in traits of functional twigs and leaves of a typical alpine shrub species, , at Kaka Mountain in the headwater region of Minjiang River. Leaf and twig traits were compared for shrubs at different growth stages (flower bud stage and flowering stage) and altitude (3600 m and 3800 m). The effects of spatial heterogeneity on their correlations and trade-offs were evaluated at leaf and twig levels, respectively.