高原鼢鼠栖息地的植被特征

对高原鼢鼠种群不同发展阶段下植被的群落特征进行了为时３年的研究。结果表明，植物种的多样性、植被的闰我度和地下生物量均表现为随鼠群数量的增另和作用时间的工而增加，群落的平均高度则因低矮植物的增加而有所下降，在一定条件睛，高原鼢鼠与植被相互作用可在某种状态下取得平衡并保持稳定。在地下生物量的组成上，直根和根茎的总量在地下生物量中所占比重保持相对稳定，但在鼠群发展初期，直根所占比重较小，而根茎所占比重较

Features of Vegetation in Myospalax baileyi Habitat

A 3year research was conducted into the features of vegetation in X]Myospalax baileyi habitats at different development stages of the rodent population. It was shown that the number of plant species, cover degree, density and aboveground biomass of the vegetation increased with an increase in the population density and the length of the active period of the rodent population, while the mean height of the vegetation decreased due to an increase in the number of lowheight plant species. Under some conditions, a balance of interaction between M. baileyi population and vegetation could be reached and maintained. In terms of underground biomass composition, the total amount of tap root and rhizome was stable, but the ratio of the former to the latter increased with the development of M. baileyi population. In the composition of fibrous roots, the roots of Cyperaceae plants increased, while those of Gramineae species decreased with the development of M. baileyi population, though the total amoun t of fibrous roots was relatively stable.