西天目山植被和昆虫群落间生态关系的数量分析

A PRIMARY STUDY OF ECOLOGICAL RELATION BETWEEN VEGETATION AND INSECT COMMUNITY IN THE WESTERN TIANMU MOUNTAIN ZHEJIANG PROVINCE,CHINA

对浙江西天目山的植被和昆虫类群进行了数值分类,探讨了昆虫类群分布和植被类型之间的相关性及环境因子对相关性的影响。结果表明:昆虫的种类组成与不同植被类型的群落层次及植物种类的组成之间是密切相关的;昆虫与乔木层和草本层植物的关系比与灌木层植物的关系更为密切;山谷逆温现象对昆虫的分布有特殊影响。通过主分量排序后的各属性负荷量,分析了植物种类的组成对主分量产生的影响。

The data of seven stands, each set on every elevation of 200 m in the westernTianmu mountain, were investigated. Both the species of individual vegetationalstratum and insect communities were analysed with numerical taxonomic methods-clustering and ordination. Three coefficients, i.e. the Euclidean distance, Bray-Curtis distance and the product moment correlation, have been calculated, andthen clustered with unweighted pair group arithemetic average linkage clusteringmethod. The dendrograms of tree, shrub and herb strata are similar to each other. TheEuclidean distance coefficient of tree stratum and insect communities, Bray-Curtisdistance coefficient for shrub and herb strata are more satisfying. Tree, shrub,herb strata and insect communities are all closely connected and dependent uponeach other, but even more evident between the tree and herbs strata and the insectcommunities are closer than that between shrub stratum and insect communities.The temperature inverse distribution at 800 m altitude strongly effected the distri-bution of insect communities. From the loading of various attributes in the princi-pal component analysis, the dominant species of plant and insect communities weredetermined, thereby the ecological relation between the tree, shrubs, and the herbstrata of different vegetation types and insect communities can be describedsimpely.