Heavy grazing reduced the spatial heterogeneity of Artemisia frigida in desert steppe

文献类型： 外文期刊

第一作者： Wang, Zihan

作者： Wang, Zihan;Han, Guodong;Wang, Zhongwu;Li, Zhiguo;Ren, Haiyan;Wang, Jing;Lv, Shijie;Sun, Hailian;Zhang, Guogang

作者机构：

关键词： Geo-statistics; Spatial distribution; Different scales

期刊名称：BMC PLANT BIOLOGY （ 影响因子：5.26； 五年影响因子：5.761 ）

ISSN： 1471-2229

年卷期： 2022 年 22 卷 1 期

页码：

收录情况： SCI

摘要： Background Grazing disturbance plays an important role in the desert steppe ecosystem in Inner Mongolia, China. Previous studies found that grazing affected the spatial distribution of species in a community, and showed patchiness characteristics of species under different grazing treatments. Artemisia frigida is the dominant species and semi-shrub in desert steppe, and whether grazing interference will affect the spatial distribution of A. frigida is studied. In this study, geo-statistical methods were mainly used to study the spatial distribution characteristics of A. frigida population in desert steppe of Inner Mongolia at two scales (quadrat size 2.5 m x 2.5 m, 5 m x 5 m) and four stocking rates (control, CK, 0 sheep center dot ha(-1)center dot month(-1); light grazing, LG, 0.15 sheep center dot ha(-1)center dot month(-1), moderate grazing, MG, 0.30 sheep center dot ha(-1)center dot month(-1), heavy grazing, HG, 0.45 sheep center dot ha(-1)center dot month(-1)). Results The results showed that the spatial distribution of A. frigida tended to be simplified with the increase of stocking rate, and tended to be banded with increased spatial scale. The density and height of A. frigida increased with increasing scale. With increased stocking rate, the density of A. frigida population decreased linearly, while its height decreased in a step-wise fashion. The spatial distribution of A. frigida was mainly affected by structural factors at different scales and stocking rate. The density of A. frigida was more sensitive to change in stocking rate, and the patchiness distribution of A. frigida was more obvious with increase in scale. Conclusions Stocking rate has a strong regulatory effect on the spatial pattern of A. frigida population in the desert steppe. Heavy grazing reduced the spatial heterogeneity of A. frigida in the desert steppe. The smaller dominant populations are unfavourable for its survival in heavy grazing condition, and affects the stability and productivity of the grassland ecosystem.

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