关帝山亚高山灌丛草甸群落优势种群的生态位研究

Study on niche of dominant species of subalpine scrubland and meadow community in Guandi Mountains

采用定量分析方法对关帝山亚高山草甸灌丛群落中的13个主要种群进行了生态位研究.首先运用TWINSPAN把33个样方分为5个群落类型,作为5个综合资源位,用Levins、Shannon-wiener生态位宽度公式和Petraitis生态位特定重叠指数公式测定群落中主要种群生态位宽度和生态位重叠,并分析各种群生态位的生态学意义.结果表明,种群生态位宽度越大,对环境的适应能力越强,对资源的利用能力也越强;生态位重叠越大,种群间的生态相似性越大,利用资源的相似性程度越高;生态位宽的种群对生态位窄的种群可能有较高的重叠值,反之则较低.

The niche characteristics of 13 of dominant species subalpine scrub and meadow community in Guandi Mountains are analyzed in this paper. First, the 33 quadrates are divided into five types of communities by TWINSPAN, which can be used as one-dimension resource states. Then the niche breadths and niche overlaps of main dominant species in subalpine scrub community and meadow in Guaidi Mountains were measured using the formulas proposed by Levins, Shannon-Wiener and Petraits. The results show that the niche breadths were great for some species, which was related with their own characteristics and the capability of adapting environment. The niche overlaps were great for some species pairs with the same or simulate environment requirements, and species with broad niche breadth have great overlaps values with other species.