云贵鹅耳枥群落物种多样性及其刀切法估计

SPECIES DIVERSITY OF CARPINUS PUBESCENS COMMUNITY AND ITS JACKKNIFE ESTIMATION

采用Ｓｉｍｐｓｏｎ指数（Ｄ）、Ｓｈａｎｎｏｎ－Ｗｅｉｎｅｒ指数（Ｈ）和均匀度（Ｅ）等，分析了中亚热带喀斯特山地云贵鹅耳枥群落及其演替过程中的物种多样性特征，并用刀切法对Ｓｉｍｐｓｏｎ指数和Ｓｈａｎｎｏｎ－Ｗｉｅｎｅｒ指数进行了估计。结果表明，云贵鹅耳枥群落的Ｓｉｍｐｓｏｎ指数为１．１４—３．８８，Ｓｈａｎｎｏｎ－Ｗｅｉｎｅｒ指数为０．５０—２．４３，均匀度为０．１９—０．７１。随着群落的发育和演替，其物种多样性呈现“高→低→高”的动态变化。Ｓｉｍｐｓｏｎ指数的刀切估计值为１．１４—３．８８，估计区间为１．０４—５．１０； Ｓｈａｎｎｏｎ－Ｗｅｉｎｅｒ指数的刀切估计值为０．５２－２．５８，估计区间为０．２４－３．１４。刀切法是一种比较有效的估测物种多样性的方法。

The characteristics of species diversity of Carpinus pubescens community and its successional community on the karst mountains in an area of 1 600 m^2 in Guiyang, Guizhou Province, were analysed using the formulas of Simpson's and Shannon-Weiner's indices, and evenness. The individual number, plant height and breast height diameter (DBH) of all trees higher than 2.5 cm in DBH were measured. The two indices were further estimated by the jackknife procedure. The results showed that Simpson's index of the community ranged from 1.14 to 3.88, Shannon-Weiner's index from 0.50 to 2.43, and evenness from 0.19 to 0.71. With the development and succession of the community, the species diversity showed a trend of high→low→high. The jackknifing estimation value of Simpson's index of the community ranged from 1.14 to 3.88, and its estimation interval from 1.04 to 5.10, while of Shannon-Weiner's index ranged from 0.52 to 2.58, and its estimation interval from 0.24 to 3.14. The jackknife method is suggested to be a more effective tool for estimating the index of species diversity.