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北京灵山亚高山损毁草甸植被群落特征研究
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摘要
通过对北京灵山亚高山草甸区内的植物群落调查,计算分析自然坡面和侵蚀沟道两种立地类型上的植物群落特征差异,为侵蚀沟道植被人工修复提供理论依据和技术支撑。结果表明:(1)Shannon-wiener指数、Margalef指数均表现为:侵蚀沟道<自然坡面,而Simpson指数、Pielou指数表现为:侵蚀沟道>自然坡面;(2)侵蚀沟道与自然坡面群落相似性系数为0.8837,β多样性指数为0.1783,表明侵蚀沟植物群落组成与自然坡面的相似性较高;(4)自然坡面和侵蚀沟道内硬质早熟禾(Poa sphondylodesTrin)、苔草(Carex lancifolia C.B.Clarke))的重要值和生态位宽度均较大,为主要的优势种;多数物种之间存在生态位重叠,但重叠值较小。总的来说,侵蚀沟道处于演替初期,趋向于恢复到群落自然状态,硬质早熟禾和苔草为主要的先锋优势种。
Based on the investigation of vegetation of subalpine meadow in Beijing Dongling Mountain,the characteristics of plant communities in the natural slope and erosion gully were calculated and analyzed to provide theoretical basis and technical support.Results showed that:(1) the Shannon-wiener index and Margalef index were all as follows:erosion gully natural slope;(2) compared with the community of the natural slope,the community similarity coefficient and β diversity index of erosion gully were 0.8837 and 0.1783,respectively;which mean erosion gully slopes and natural plant community composition had higher similarity;(3) the niche breadths and the important value of plants of Poa sphondylodes Trin and Carex lancifolia C.B.Clarke were larger both in the natural slope and erosion gully,respectively.In addition,most plants had niche overlap between species in both natural slope and erosion gully,but the niche overlap values were relatively small.All in all,Erosion gully is in the early succession and tend to restore the natural state.Poa sphondylodes Trin and Carex lancifolia C.B.Clarke are the pioneer dominant species of community.
引文
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