植物生态学报 ›› 2000, Vol. 24 ›› Issue (3): 268-274.

• 论文 • 上一篇    下一篇

草原群落退化与恢复演替中的植物个体行为分析

王炜,梁存柱,刘钟龄,,郝敦元   

  1. 内蒙古大学自然资源研究所,呼和浩特
  • 发布日期:2000-03-10
  • 通讯作者: 王炜

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

WANG Wei, LIANG Cun-Zhu, LIU Zhong-Ling and HAO Dun-Yuan   

  1. Institute of natural resources, Inner Mongolia university, Hohhot
  • Published:2000-03-10
  • Contact: WANG Wei

摘要: 定义植物个体小型化是在草原过度放牧条件下,草原植物植株变矮,叶片变短、变窄,节间缩短,以及根系分布浅层化等性状的集合。小型化个体的生态学属性介于环境饰变与生态型之间,特称之为扰动响应型。个体小型化逆转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,与演替时间有关。个体小型化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。 在草原群落退化演替机理研究中,对个体小型化的深入认识是十分重要的环节。

关键词: 退化草原, 恢复演替, 个体小型化, 个体正常

Abstract: 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.

Key words: Grassland degradation, Restoration succession, Individual miniaturization, Individual normalization