草原群落退化与恢复演替中的植物个体行为分析

定度植物个体小型化是在草原过度放牧条件下草原植物植株地片变短、变窄，节间缩短，以及根条分布浅层化等笥状的集合。小型化个体的生态学属性介于环境饰变与生态型之间，特称之为响应型。个体小型化逆转变过程表现出集体行为，小型化个体具有维持其形状的保守性，变化的阶段性和突变性；小型化的逆过程即正常化过程号常规替时间有关。个体经是过度放牧下群落生产力衰退的重要表现，是对过度放牧的负反馈机制。在草原群落经演替机理

Analysis of the Plant Individual Behaviour During the Degradation and Restoring Succession in Steppe Community

Plant individual miniaturization resulting from over-grazing can be characterized by a suite of morphlogical traits: stunted height, shortened and narrowed leaf blades, shortened internodes, hardness in stems and leaves and roots shallower in the soil profile. In terms of ecological attributes, plant miniaturization belongs to a specific type that lays between an ecotype and a form of environmental modification, and is defined here as a type of disturbance response. Individual miniaturization is the basic cause of decreasing community productivity resulting from over-grazing. It is a negative feed back mechanism and an important link in degradation succession mechanisms in grassland communities.