对西双版纳热带雨林20hm2动态监测样地直径大于1 cm的乔木树种多度分布特征进行分析研究,结果表明:(1)样地内的13个优势种占物种总数的2.78%,却占总个体数的56.34%;230个稀有种(＜1株个体/hm2),占物种数的49.14%,仅占个体总数的1.24%,是两双版纳热带季节雨林动态监测样地种-多度分布的一个显著特征.(2)随机模型拟合的种面积曲线与观测值差别较大,表明样地内树木不是随机分布的.(3)对数正态分布和对数级数分布都不能很好地拟合样地内的种-多度分布规律.但相比而言,对数级数分布拟合效果稍好,表明环境对两双版纳热带雨林乔木种-多度分布具有一定的贡献.%Species-abundance relationship, one of the most fundamental characters of community structure, is a very important issue in community ecology. Based on the tree(with DBH greater than 1cm)data collected from the 20-ha plot of tropical rainforests of Xishuangbannan, species abundance distribution pattern is analyzed in this paper. The results showed that.( 1 ) Thirteen of 468 species (2.78％)had more than 1 000 individual ≥ 1 cm DBH, which represented 56.36 ％ individuals of the total. On the other hand, 230 of 468 species (49.14 ％ )had a mean density ≤ 1 tree per ha in the 20-ha plot. (2) There was a significant difference between the observed species-area relationship and the random placement model, which indicated that species did not have a random distribution in the plot. Also the speciesabundance distribution of the plot could not be well fitted by using the lognormal model confirmed this. (3) The log serial model could not fit the species-abundance well(but better than the lognormal model), which indicated that the environment was not the determining factor, but it indeed contributed much to the species abundance distribution.
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