锡林郭勒典型草原不同群落物种间关系的数量分析

Quantitative Analysis of Relationships among Species of Different Communities in Typical Steppe in Xilingol

以典型草原刈割与放牧利用下的4个草地群落为研究对象,分析群落物种间关联性、物种生态位及生态位重叠,研究不同利用方式、不同群落中物种之间的数量关系。结果表明:羊草单优群落总体关联性表现出近似无关联,群落稳定,各物种总体上呈分散独立关系,处于演替过渡状态的群落总体关联性为负关联。相同物种对在不同群落中关联性质、关联程度不同。羊草与冷蒿具有较大的生态位宽度,生态位宽度大的种间生态位重叠较高,相同物种对生态位重叠在不同群落中而异。处于演替过渡状态的群落生态位重叠高于结构稳定的羊草单优种群落。

Species associations, niche and niche overlaps of 4 communities in grazing and mowing in typical steppe were analyzed to indicate relationships among species. The results showed that： mono-dominant community of Leyrnus chinensis showed no association. Under mowing the community remained sta- ble state and species was dispersed in dependent relationship. The communities in succession state showed a negative correlation. The same species showed different correlation properties and correlation degree. The niche breadth of species showed difference in different succession state communities. Leymus chinensis and Artemisia frigida had the greatest niche breadth. The species with great niche breadth had high niche overlaps. The same species showed different niche overlaps in different community. Community niche o- verlaps was higher in succession state than the ones in stable Leyrnus chinensis community.