Abstract:

The foliar δ13 C values of 226 plant species sampled from 7 transects belonging to 2 rainforests (named Chengzi and Bubeng, respectively) in Xishuangbanna of Yunnan Province, China were analyzed. The characteristics of foliar δ13 C values and water use efficiency (WUE) of plants indicated by δ13 C values in this region were studied. In the mean time, the average foliar δ13 C values of plants in different transects and with different growth forms (i.e., tree, shrub, herb and liana) were compared. The results showed that: 1. the foliarδ13 C value in Xishuangbanna, ranging from -3.865%--2.760%, was similar to those of other typical rainforests in the world (Amazon and Puerto Rico, for instance), which indicated that the rainforests in this region had the typical characteristics of rainforests of the world; 2. there were significant differences between Chengzi and Bubeng in average foliarδ13 C values, with the latter being lower than that of the former; significant differences also existed between different transects in the same forest, which indicated that water conditions and orientation of transects might have resulted in these differences; 3. the average foliarδ13 C value of evergreen plants was significantly lower than that of deciduous plants, and there also existed significant differences between different growth forms, implying that the WUE of these plant species was also quite different. 

云南西双版纳片断化热带雨林植物叶片δ¹³C 值的特点及其对水分利用效率的指示
渠春梅 韩兴国* 苏波  黄建辉 蒋高明
（中国科学院植物研究所植被数量生态学开放实验室，北京100093）

 关键词：δ¹³C；片断化热带雨林；水分利用效率；生长型

Key words: foliarδ13 C, fragmented rainforests, water use efficiency, growth forms