摘要
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、植被的盖度、多度和地上生物量均表现为随鼠群数量的增加和作用时间的延长而增加，而群落的平均高度则因低矮植物种的增加而有所下降。在一定条件下，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，而根茎所占比重较大，随着鼠群数量趋于饱和，直根比重增大，根茎相应降低；在须根组成中，莎草科植物根系随鼠群数量和作用时间的增加而增加，禾本科植物根系则相应减少，须根系总量保持相对稳定。
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.
出处
《草业学报》
CSCD
1999年第2期43-49,共7页
Acta Prataculturae Sinica
关键词
高原鼢鼠
植被
群落特征
作用关系
鼠害
Myospalax baileyi, vegetation, community characteristics, active
period
