植物生态学报 ›› 2000, Vol. 24 ›› Issue (6): 641-647.

• 论文 •    下一篇

锡林河流域羊草草原植物种群和功能群的长期变异性及其对群落稳定性的影响

白永飞,陈佐忠   

  • 发布日期:2000-06-10
  • 通讯作者: 白永飞

Effects of Long-Term Variability of Plant Species and Functional Groups on Stability of a Leymus chinensis Community in the Xilin River Basin, Inner Mongolia

BAI Yong-Fei and CHEN Zuo-Zhong   

  • Published:2000-06-10
  • Contact: Su Bo

摘要: 分析了内蒙古锡林河流域羊草(Leymus chinensis)草原群落植物种群、功能群和群落生物量的长期变异性,以及植物功能群间的补偿作用对群落稳定性的影响,结果表明:从种群水平到功能群和群落水平,地上生物量的年度间变异性逐渐降低,而稳定性则逐渐增加。植物功能群组成对群落稳定性具有更强烈的影响,在植物生活型功能群组成中多年生根茎禾草与多年生丛生禾草和多年生杂类草功能群,在生物量的年度变化上具有补偿作用,在生态类群组成中,旱生植物与中旱生植物也具有补偿作用。植物种群多度的长期变异性可能依赖于物种对环境波动的敏感性和种间相互作用对环境波动的放大效应,生物多样性使物种对环境波动响应的多样性增加,并通过不同响应类型(功能群)间的补偿作用使群落稳定性增加。

Abstract: The long-term variability of plant species, functional groups and compensatory effects between functional groups within a Leymus chinensis community were studied during 1980-1999 in the Xilin River Basin of Inner Mongolia. The results showed that long-term variability of aboveground biomass decreased from the plant species level to the functional group and community levels. Plant species and functional composition were the principal factors explaining the long-term variation in production of the community. There were obvious compensatory effects in the dynamics of biomass between perennial bunch grasses and perennial rhizome grasses and forbs, between xerads and intermediate xerads, and between intermediate mesophytes and mesophytes. Longterm variability in the biomass of populations seems to depend on the sensitivity of species to environmental fluctuations and amplification of environmental fluctuations by interactions among species. Biodiversity may increase community stability by promoting diversity among species due to their differentiated responses to environmental fluctuations, and by compensatory effects among plant functional groups.