摘要
通过拟合对数正态分布曲线描述四面山次生灌丛的种多度格局 ,并用多种公式计算该群落的物种多样性 ,通过比较与分析 ,得出结论 :1四面山次生灌丛群落的种多度关系符合对数正态分布模型 ,结合分布曲线指出在此群落中多度大的物种只有极少数 ,多数物种的多度都偏小 ,从而说明了次生灌丛群落的年轻性与不稳定性 ;2该群落的物种丰富度、均匀度和总多样性指数值都较低 ,揭示次生灌丛作为森林演替的初级群落其结构与组成部分较简单 ,功能还不完善 ,同时指出为提高森林覆盖率 ,有必要保护和发展次生灌丛 。
The species-abundance pattern of the secondary shrub in Mt.Simian is discribed with the curve which drafted by lognormal distribution model,and the species diversity of the community is calculated by means of various formulas. Based on the comparing and analyzing, the results are as follows:①The species-abundance relationship of the secondary shrub accords with the lognormal distribution model. The distribution curve indicates that there are a few species with large abundance,and the abundance of the majority of the species are small,which suggests that the community is young and unstable. ②The richness indices, evenness indices and diversity indices of the community are very small.This indicates the structure and the composition of the secondary shrub which belongs to the primary community of the forest succession are simple,and the function isn't perfect.In the meantime, it refers that it's necessary to protect and develope the secondary shrub,improve the diverity in order to increase the covering rate of the forest.
关键词
次生灌丛
物种多样性
对数正态分布
重庆
群落
secondary shrub
species diversity
lognormal distribution model
diversity indices
Simian Mountain/Chongqing
