害鼠防治生态学研究——高原鼢鼠危害下的植物群落的主分量分析及演替规律

RESEARCHES ON THE RODENT MANAGEMENT ECOLOGY I. Succession and the Principal Components Analysis about the Plant Communities Damaged by the Plateau Zokors

本文采用主分量分析研究高原鼢鼠危害下的植物群落的演替及分类.结果表明:鼢鼠危害的程度严重影响着植物群落的组成,随着鼠密度的增高,植物群落沿矮嵩草+针茅+垂穗披硷草+美丽风毛菊群落→艾菊+垂穗披硷草+蒲公英+矮蒿草群落→鹅绒委陵菜群落(鹅绒委陵菜+早熟禾阶段→鹅绒委陵菜+萼果香薷阶段)的方向演替.

Using a method of the principal components analysis we researched the succession of the plant communities damaged by the plateau zokors,and took classification of the plant communities.The results show that composition of the plant community is related to the density of zokors.Through ordination the quadrats are separted into four groups in two-dimensional space,they respectively indicate the different plant communities.The contents of the Elymus dahuricus and Stipa in these quatrats are a stan- dard to distinguish different plant communities.With the increase of zodor density,the failing succession of the plant communi- ties develops along Kobresia humilis+stipa sp.+ Elymus dahuricus+Saussurea superba→Ajania tenuifolia+Elymus dahuricus +Taraxacum sp.+ Kobresia humilis→Potentilla anserina+Poa sp.→Potentilla anserina+Elsholtzia calycocarpa. On the basis of the correlation matrix analysis it is found that the distributions have intense repelling action between the fine forage grass and weeds.The correlation coefficient is smaller among the most of species.