太岳山森林群落优势种群生态位研究

要：采用Shannon-Wiener指数和Petraitis’s重叠指数对太岳山森林群落19个优势种群的生态位进行研究．结果表明：组成太岳山森林群落的19个优势种群中，有18个种群的生态位宽度指数比较大，说明它们对环境的适应能力较强且能较好的利用环境资源．在群落的乔木层中，油松的生态位宽度最大，为1.985，但油松与其它优势种群的生态位重叠指数都很小，这与油松分布广、面积大和特化程度低的特征有关．19个优势种群之间的生态位重叠指数大于0.2的只有7个种对，大于0.1的共有15个种对，可见太岳山森林群落优势种群的生态位分化程度较高，种间的竞争关系较弱．

Study on the Niche of Dominate Populations of the Forest Community in Taiyue Mountains,Shanxi

The niches of 19 dominant populations in Taiyue Mountains forest community,Shanxi are studied by using Shannon-Wiener and Petraitis'overlapping indices.The result indicated that among the 19 dominant populations,18 of them had bigger niches breadth indices that means they are more adaptive to the environment and can make a better use of the resources.However,Pinus tabulaeformis with the widest niche breadth,1.985,has very small overlap indices with the other dominant populations,which is related to its wide distribution,larger coverage and lower specialization level.Among the 19,there are only 7 pairs that has niche overlapping indices over 0.2,15 over 0.1,which indicatd a higher niche polarization of dominant populations and a weaker competition in forest community in Taiyue Mountains,Shanxi.