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羊草草原不同放牧强度植物功能群多样性和生产力的研究

Diversity and Productivity of Plant Functional Groups under Different Grazing Intensities of Leymus Chinensis Steppe

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【Author in Chinese】 贾亚娟

【Supervisor】 韩国栋赵萌莉

【Author's Information】 内蒙古农业大学, 生态学, 2007, 硕士

【Abstract in Chinese】 羊草草原是亚洲中部草原特有的一类根茎禾草草原,对其在放牧条件下的草地的研究有助于认识典型草原的整体状况,具有普遍意义。近年来,随着人们对多样性和生态系统功能研究的深入,对功能群的研究已经成为一个新的研究焦点,不同的学者从不同的侧面对其进行分析和探讨,得到了许多有价值的结论。本项研究通过野外生态学调查,探讨不同放牧强度羊草草原生产力、植物多样性和功能群的变化,目的是通过比较分析内蒙古羊草草原不同放牧强度下,草地群落和功能群在生物量和多样性的变化,以及植物功能群间的补偿作用,找出植物多样性对放牧强度影响的响应机制,为草地合理利用提供依据。研究结果如下:(1)随放牧强度增加,植物多样性呈现为下降的趋势,在中度放牧区稍有增加,同时物种多样性与功能群多样性之间存在相关性;(2)群落生物量随放牧强度增加而减少,从功能群方面分析,不同功能群却表现出不同的变化趋势,多数植物功能群表现为下降的的趋势,只有灌木类功能群地上生物量有所上升。(3)在功能群之间有对应的增加或减少的趋势,功能群之间存在着补偿作用,即一种功能群的减少对应着另一种功能群的增加,从而使整个生态系统趋于稳定;(4)放牧强度增加会使土壤养分下降,含水量减少,土壤结构也变得坚实紧密,土壤通气透水性变差,这种变化在表层土壤的变化更加明显。

【Abstract】 Leymus chinensis steppe is one of the unique types of rhizomatous steppe that appeares in middle-Asia. In recent years, plant functional groups have been became a new research focus.This study was based on the ecological investigation, discussing the variation regularity of plants productivity and biodiversity of Leymus chinensis rangeland at different grazing intensities. The aim is to find the response mechanism in plants diversity under different grazing intensities by comparing the biomass and biodiversity of community and functional groups, and it also would give suggestion for rational exploitation of steppe. The main results showed as follow: (1) As the grazing intensities increased, biodiversity was reduced , but it increased at moderately grazing area. And there were some relationships between biodiversity and functional diversity. (2) Plant biomass reduced with the grazing level increased. (3)Different plant functional groups have changed in different ways, and it has compensatory effects among them. (4) As grazing intensities increased,it could make the soil nutrients decrease, water content reduce, and soil compaction increase, soil aeration and permeability reduce, this change is obvious in surface soil.

【Keywords in Chinese】 放牧强度生产力多样性植物功能群
【Key words】 Grazing intensitiesProductivityBiodiversityPlant functional groups
  • 【CLC code】S812
  • 【Downloads】504
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