高寒地区草地放牧演替与害鼠密度关系的研究

STUDIES ON THE RELATIONSHIP BETWEEN GRAZING SUCCESSION OF GRASSLAND AND HARMFUL RATS DENSITY IN ALPINE REGION

在定性划分放牧演替的基础上，应用Ｗｈｉｔｔａｋｅｒ的生境梯度分析法、进行了演替阶段的定量校正。根据校正后演替序列的基本数据，应用关联分析法分别对害鼠密度与植物群落各特性以及主要植物优势度的相互关系进行了探讨。分析结果表明，植物群落物种多样性和早熟禾优势度在各自的关联分析中对害鼠（高原鼠兔）密度的关联度分别是０．８２３和０．８８６。由此，从群落角度说，物种多样性大小是调控害鼠密度的主要因子；从植物种类角度说，早熟禾的多少是调控害鼠密度的主要因子。

On the basis of quantitative analysis on grazing successive stages, the quantitative correction on successive stages was conducted by Whittaker's method of habital gradient analysis.According to the data of correctional successive order,the relation of the characteristics of plant communities and the main plant dominance on the harmful rats density was approached by correlation analysis respectively.The results showed that the relation of the species diversity of the plant communities and the Poa sp.dominance on harmful rats density in each correlation analysis were all closest,their correlative degrees were 0.823 and 0.886 respectively.Therefore, from the two analyses of plant communities and species,the species diversity and the Poa sp.dominance were the main factor controlling the harmful rats density respectively.