甘肃陇南地震滑坡体自然恢复5a后植被群落分布特征
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摘要
以甘肃陇南地震滑坡体自然恢复过程中植被群落为研究对象,以坡面为尺度,采用样带结合海拔梯度的方法进行了调查。根据野外调查资料,应用生物多样性的原理和方法分析了甘肃陇南地震滑坡体自然恢复5 a后植被群落结构特征及多样性空间分布的变化情况。结果表明试验区内主要植物以菊科和禾本科植物为主,群落垂直结构明显,大体分为3层;该群落中一年生草本植物种类最多,是该群落中处于优势地位的生活型;在7个样地中,随着海拔升高,Shannon-Wiener多样性指数(H′)的变化趋势和Pielou均匀度指数(E)的变化趋势基本相同,均呈现先增大后减小的单峰趋势,Margalef丰富度指数(R)和Simpson优势度指数(C)表现出基本相同的变化趋势,均表现出先减小后增大再减小的偏峰格局势,峰值偏向高海拔区。
Taking the vegetation community of Longnan area in Gansu Province,China in the process of natural restoration after earthquake-induced landslide as the research object,an investigation on the slope scale was conducted by adopting belt transect method,combined with the elevation gradient method as well. Based on data of field investigation,the characteristics and spatial distribution of vegetation community of five-year-later natural restoration after earthquake-induced landslide were analyzed with the principle and method of biological diversity. The results showed that compositae and gramineae are the main plants in the test zone,the vertical structure of community was obvious and could be divided into three layers; species of annual herb and hemicryptophyte are the most ones in the community,they are life type in a dominant position; in 7 sample areas,with the increasing of altitude,the change trend of Shannon Wiener diversity index(H')- and the change trend of Pielou evenness index(E)are almost the same,all of them showed unimodal trend of first increased and then decreased,Margalef abundance index(R)and Simpson dominance index(C)showed the same change trend,all of them has the partial peak trend of first decreased and then increased,peak value is partial to high altitude area.
引文
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