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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (12): 68-76.DOI: 10.11686/cyxb2023067

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Spatial distribution of the Leymus chinensis population under different grazing intensities in a typical steppe area

Jin-rui WU1,2(), Meng-zhen LI1,2, Yong YANG3,4, Ai-jun LIU3,4, Pu-chang WANG5, Hasibagen1,4, Shi-jie LYU6, Xiang-jun YUN1,4()   

  1. 1.Grassland Research Institute,Chinese Academy of Agriculture Sciences,Hohhot 010010,China
    2.Graduate School of Chinese Academy of Agricultural Sciences,Beijing 100081,China
    3.Inner Mongolia Forestry Monitoring and Planning Institute,Hohhot 010020,China
    4.Key Laboratory of Grassland Remote Sensing and Emergency Technical Reserve in Inner Mongolia Autonomous Region,Hohhot 010051,China
    5.School of Life Science,Guizhou Normal University,Guiyang 550025,China
    6.College of Science,Inner Mongolia Agricultural University,Hohhot 010018,China
  • Received:2023-03-06 Revised:2023-05-17 Online:2023-12-20 Published:2023-10-18
  • Contact: Xiang-jun YUN

Abstract:

The aim of this study was to explore the spatial distribution characteristics and trends in the growth of Leymus chinensis under different grazing intensities in a typical steppe area. The L. chinensis population at the Typical Steppe Experimental Station of the Chinese Academy of Agricultural Sciences was subjected to grazing at four intensities: No grazing as the control (CK), light grazing (LG), moderate grazing (MG) and heavy grazing (HG). The data were analyzed using box plot and multifractal methods. The results showed that the spatial distribution of the L. chinensis population under different grazing intensities had multifractal characteristics. The spatial distribution of the L. chinensis population was complex and non-homogenous in the MG and HG treatments, but relatively uniform in CK and the LG treatment. As the grazing intensity increased, the spatial distribution of the L. chinensis population changed from uniform to aggregated, the niche breadth remained comparatively consistent, and the competition intensity among individuals decreased. Regardless of the differences in grazing intensity, the spatial distribution characteristics of the L. chinensis population in this typical steppe area were dominated by large probability subsets, and L. chinensis still occupied a dominant position in the community.

Key words: grazing intensity, Leymus chinensis, spatial distribution, multifractal analysis