Abstract: [Objective] Our objective was to explore the change features of non-structural carbohydrates (NSC) in different organs of dominant species in a monsoon broad-leaved evergreen forest.[Methods] In December of 2013, foliage, branch, stem and root were sampled from 20 dominant species in a monsoon broad-leaved evergreen forest in Pu'er, Yunnan Province. Sucrose, fructose, glucose and starch in the all four organs were measured. The variation characteristics of sucrose, fructose, glucose and starch content with the species and their organs were analyzed by Repeated-Measure ANOVA. [Results] The concentration of NSC differed significantly among different species and organs. The soluble sugar concentration, including sucrose, fructose, and glucose, were the highest in the foliage and the lowest in the stem. The starch concentration was, however, the highest in the root and the lowest in the foliage. The soluble sugar mainly located in the foliage for most species, and starch mainly located in the root. The coefficient of variation (CV) for NSC components was all high in different organs. The range of CV for sucrose, fructose, glucose and starch in different organs were 45.99%－61.40%, 60.96%－86.26%, 56.41%－97.40%, and 40.40%－55.01%, respectively. The CV for most species were higher than 50%, even exceeded 100%. Factorial analysis of variation for each parameter, with organ and species as independent variables, showed that the concentration of sucrose, fructose, and glucose were mainly determined by species. However the concentration of starch was mainly determined by the organ. All the effects of species, organ and their interaction on NSC were significant. [Conclusions] Different species had the varying concentrations of NSC and its compositions in the monsoon broad-leaved evergreen forest in Pu'er. The soluble sugar, including sucrose, fructose, and glucose, mainly distributed in the foliage, while the starch mainly distributed in the root. Species mainly affected the soluble sugar concentration and the organ mainly affected the starch concentration.

Key words: monsoon broad-leaved evergreen forest, non-structural carbohydrates soluble sugar, starch