短花针茅荒漠草原斑块尺度物种多样性及其共存格局

Abstract

Abstract: Clarifying the species co-occurrence pattern at patch scale is of important significance for understanding the maintenance mechanism of biodiversity in desert steppe fragmentation. According to the degree of soil habitat degradation at patch scale, this study contrasted and examined the species composition and diversity of different patches and the species co-occurrence pattern based on three typical patches in a Stipa breviflora desert steppe. The results indicated that ① Patch A was a consociation and belonged to a community of S. breviflora. Patch B was a community of S. breviflora and Astragalus melilotoides. And Patch C was a community of Sophora alopecuroides + Cynanchum komarovii + Artemisia scoparia). ② In community structure, the diversity of Patch A and Patch B was similar and higher than that of Patch C where S. breviflora grew. ③ The analyzed results based on the null model showed that the complexity and intensity of species co-occurrence patterns was in an order of Patch A > Patch B > Patch C. Four of the 16 significant species pairs in patch A had a significant competitive relation, while the species pairs in patch C were reduced to 7 groups, and there was only one significant competitive species pair (A. scoparia and S. alopecuroides) in patch C. Therefore, Non-desertified soil habitat patches were the important prerequisite for the biodiversity maintenance of desert steppe fragmentation. The non-desertified of soil habitat reduced significantly the complexity of community structure within patches and the intensity of interaction between species, which was unconducive to the self-maintenance of the community.

Key words: desert steppe, Stipa breviflora, patch scale, importance value, species diversity, co-occurrence pattern, Ningxia

YU Rui-xin, TIAN Na, WANG Xing, WANG Lei, YANG Xin-guo, JIANG Qi, ZHOU Juan.

Species Diversity and Co-Occurrence Pattern at Patch Scale in Stipa breviflora Desert Steppe [J].Arid Zone Research, 2019, 36(2): 444-450.

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Species Diversity and Co-Occurrence Pattern at Patch Scale in Stipa breviflora Desert Steppe

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