文献类型： 外文期刊

作者： Li, Yu ¹ ; Dong, Shikui ² ; Gao, Qingzhu ⁴ ; Fan, Chun ¹ ; Fayiah, Moses ⁵ ; Ganjurjav, Hasbagan ⁴ ; Hu, Guozheng ⁴ ; Wang, Xuexia ⁶ ; Yan, Yulong ⁷ ; Gao, Xiaoxia ⁸ ; Li, Shuai ⁸ ;

作者机构： 1.Chongqing Technol & Business Univ, Sch Publ Adm, Chongqing, Peoples R China

2.Beijing Forestry Univ, Sch Grassland Sci, Beijing, Peoples R China

3.Cornell Univ, Dept Nat Resources, Ithaca, NY 14850 USA

4.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing, Peoples R China

5.Njala Univ, Sch Nat Resources Management, Dept Forestry, Njala, Sierra Leone

6.Beijing Acad Agr & Forestry Sci, Beijing, Peoples R China

7.China New Era Grp Corp, Beijing, Peoples R China

8.Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing, Peoples R China

关键词： grazing regime; dominant species; functional composition; co-occurrence network; community assembly

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Grazing is a substantial threat to the sustainability of grassland ecosystems, while it is uncertain about the variety of plant and soil microbial community and the linkages between them limit the comprehensive understanding of grazing ecology. We conducted an experiment on the effects of the grazing regimes rotational grazing (RG), continuous grazing (CG), and grazing exclusion (GE) on an alpine meadow in Qinghai-Tibetan Plateau. The differences of plant community composition, soil microbial community assembly mechanism, and taxonomic and functional composition between grazing regimes were examined, and the relationship between plant species and the soil microbes was assessed by constructing a co-occurrence network. The results showed that the plant community composition varied with the grazing regimes, while the soil microbial community composition did not vary with the grazing regimes. The soil bacterial functional composition was similar under RG and CG, while the soil fungal functional composition was similar under GE and RG. The soil microbial community under all grazing regimes was assembled mainly according to stochastic rather than deterministic mechanisms, and RG and CG reduced the relative importance of the stochastic ratio. At the microbial phylum level, CG and GE increased the relative abundance of Acidobacteria and Armatimonadetes and CG and RG increased the relative abundance of Elusimicrobia. In the network of plant species and soil microbial classes, plants and bacteria themselves were mainly positively linked (symbiosis and promotion), while plants and soil microbes were mainly negatively linked (competition). There were five microbial generalists in the network, which connected with many microbes, and four showed no difference in their abundance among the grazing regimes. Overall, the stable key microbes in the network and the fact that many of the plants are unconnected with microbes weakened the impact of grazing-induced changes in the plant community on soil microbes, probably resulting in the stable soil microbial community composition. Moreover, there was still a dominant and tolerant plant species, Kobresia pygmaea, that connected the plant and microbial communities, implying that the dominant plant species not only played a crucial role in the plant community but also acted as a bridge between the plants and soil microbes; thus, its tolerance and dominance might stabilize the soil microbial community.