Soil bacterial community shifts driven by restoration time and steppe types in the degraded steppe of Inner Mongolia

文献类型： 外文期刊

第一作者： Yao, Minjie

作者： Yao, Minjie;Rui, Junpeng;Li, Jiabao;Li, Xiangzhen;Wang, Junming;Cao, Weidong;Cao, Weidong;Li, Xiangzhen

作者机构：

关键词： Soil bacterial community; Restoration; Grazing; Fencing; Inner Mongolia steppe

期刊名称：CATENA （ 影响因子：5.198； 五年影响因子：5.594 ）

ISSN： 0341-8162

年卷期： 2018 年 165 卷

页码：

收录情况： SCI

摘要： Degraded grassland can be restored through management practices such as fencing to protect land from over-grazing. However, little is known about the dynamics of underground microbial communities and their associated ecological function during the restoration process. In this study, we investigated changes in the soil bacterial community composition with varying restoration time in the Leymus chinensis steppe. We also studied the differences in the soil bacterial community composition between a Leymus chinensis steppe and a Stipa grandis steppe at the same restoration time in the Inner Mongolia of China. Results showed that restoration of the degraded steppe through fencing significantly changed the bacterial community composition through the restoration time. The relative abundances of Chlorofiexi and Cyanobacteria decreased significantly with restoration. However, the relative abundances of copiotrophic Proteobacteria and Bacteriodetes increased. Significant changes for many dominant taxa occurred between 7 and 13 years of restoration time in the Leymus chinensis steppe. Shifts in the composition of bacterial communities with fencing and grazing were driven by multiple factors, including soil moisture, pH, nutrients (organic carbon and nitrogen, etc.). Network analysis of soil bacterial community compositions showed that the three largest modules in co-occurrence networks were separated by fencing, grazing and steppe type. This study revealed the successions of underground microbial communities associated with steppe restoration management over time.

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