武夷山自然保护区郁闭稳定甜槠林与人为干扰甜槠林物种多样性比较

 研究了武夷山自然保护区郁闭稳定甜槠林与人为干扰甜槠林的物种多样性，分别利用物种丰富度指数、Shannon-Wiener指数、Pielou均匀度和Simpson指数作了比较。结果表明郁闭稳定甜槠林的物种丰富度为11.3704，Shannon-Wiener指数为3.9404，均匀度为63.05％，Simpson指数为6.3740；人为干扰后的甜槠林的各项物种多样性指数值远比郁闭林高，分别为20.0479、5.5431、78.44％、21.7163，其中灌木层与草本层所起的作用较大。利用群落优势度(C)衡量了两个群落的稳定性，表明郁闭林的群落优势度远高于人为干扰林。而受到干扰的群落，阳性种入侵，阴性高大乔木待恢复，中等树木和幼苗尚存。演替过程中，群落物种多样性的增加是生态系统对外界轻度干扰的一种适应，是恢复生态系统稳定性的一种对策。

Studies on the Species Diversity of the Closed Stable Forest and the Disturbed Forest of Castanopsis eyrei in Wuyishan National Nature Reserve

The species diversity of the closed stable forest and the disturbed forest of Castanopsis eyrei have been studied by using species richness index(dGl),Shannon-Wiener index(H′),Pielou evenness(J),Simpson index(D). The results show that the dGl,H′,J and D of the closed stable forest were 11. 3704,3. 9404,63.05%,6. 3740 respectively. The indices of species diversity in the disturbed forest were 20. 0479,5.5431,78.44% and 21.7163 respectively, higher than those in the closed forest, especially in the shrub layer and herb layer. Comparing the stability of two forests with community dominance index(C) ,it was clear that the C of the closed stable forest was higher than that of the disturbed forest. In the disturbed forest, many heliophilous plants invaded and the shade tolerant plants were not recovered. It is proposed that in the succession, the increase of species diversity is a adapting manner for the ecosystem to disturbing, and is a strategy of ecosystem to recover the stability.