Community characteristics and diversity analysis on vegetation structure in different slope directions in Southern grassland: a case study in GuangNan county
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摘要: 为了解南方草地植被群落特征,以云南省东南部的广南县草原不同坡向植被为研究对象。用Margale丰富度指数、Simpson优势度指数、Shannon-Wiener指数和Pielou均匀度指数分析其物种组成与结构。结果表明:(1)野外调查共记录到草本植物84种,隶属于31科76属,其中以禾本科植物种类最多,有19属22种;(2)不同植被结构的优势种与坡向条件无关,不同植被结构下草本植物的物种数阴坡较阳坡更为丰富;(3)坡向对植被均匀度影响较小,但对丰富度和优势度影响比较明显;坡向对灌草型植被丰富度和优势度指数影响较大。总体而言,坡向对不同植被群落结构下草本植物种类组成影响相对较小,但对不同植被群落结构下草本植物分布以及物种多样性产生较大影响。Abstract: In order to understand the characteristics of grassland vegetation community in southern China, the species composition and structure of grassland vegetation with different slope orientation in Guangnan county,Southeastern Yunnan Province were analyzed by Margale richness index, Simpson dominance index, ShannonWiener index and Pielou evenness index. The results showed that :(1) A total of 84 species of herbaceous plants were recorded in the field survey, belonging to 31 families and 76 genera. Among them, the grasses had the largest number of species, 22 species belonging to 19 genera;(2) the dominant species of different vegetation structures have nothing to do with the slope conditions, and the number of species in herbal vegetation under different vegetation structures is richer;(3) the influence of slope aspect on vegetation evenness was small, but the influence on richness and dominance was obvious. In general, different slope directions had a relatively small effect on the species composition of herbaceous plants under different vegetation community structure, but had a great effect on the distribution and species diversity of herbaceous plants under different vegetation community structure.
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