中国草地学报2025，Vol.47Issue(2)：91-103,13.DOI:10.16742/j.zgcdxb.20240220
放牧强度对内蒙古荒漠草原土壤细菌群落结构的影响
Effects of Grazing Intensity on Soil Bacterial Community Structure in the Desert Steppe of Inner Mongolia
摘要
Abstract
Grazing can alter the structure and function of grassland ecosystems.Currently,research on the impact of grazing on soil bacterial communities primarily focuses on the effect of grazing intensity on sur-face soil.However,the effects of grazing intensity on bacterial community structure in different soil layers remain unexplored.This study aimed to provide a theoretical basis for the protection and sustainable use of desert steppe ecosystems by examining the impact of grazing intensity on soil bacterial communities at vari-ous soil depths.High-throughput sequencing was used to examine the diversity and composition of soil bac-terial communities at different depths under five grazing intensities:no grazing(CK),light grazing(LG),moderate grazing(MG),heavy grazing(HG),and extremely heavy grazing(OG)in the desert steppe of Inner Mongolia.The results showed as follows:(1)Compared to CK,the LG treatment significantly increased the diversity of the soil bacterial community in the 0-20 cm soil layer.(2)At the phylum and genus levels,compared to CK,the relative abundance of Actinobacteriota and Rubrobacter significantly decreased in the 0-20 cm soil layer under all grazing intensities.Under LG treatment,the relative abun-dance of Proteobacteria significantly increased.In the 20-40 cm soil layer,the relative abundance of Acido-bacteriota and the RB41 significantly increased under MG treatment,while the relative abundance of Rubro-bacter significantly decreased under OG treatment.(3)Redundancy analysis(RDA)revealed that dis-solved organic carbon,total nitrogen,water content,ammonium nitrogen,nitrate nitrogen,and pH were the main environmental factors influencing changes in soil bacterial α-diversity.Correlation analysis between soil physical and chemical properties and the relative abundance of soil bacteria indicated that bacte-ria abundance in different groups was most strongly associated with ammonium nitrogen,nitrate nitrogen,water content,and organic matter.This study highlighted the effect of grazing on the composition of soil bacterial communities in the Inner Mongolia desert steppe by altering soil physical and chemical properties.The findings have significant implications for the sustainable management of desert steppe ecosystems in Inner Mongolia.关键词
放牧强度/荒漠草原/土壤微生物/土壤理化因子Key words
Grazing intensity/Desert steppe/Soil micobiota/Soil physical and chemical factors分类
农业科技引用本文复制引用
常宇涵,王珍,任海燕..放牧强度对内蒙古荒漠草原土壤细菌群落结构的影响[J].中国草地学报,2025,47(2):91-103,13.基金项目
国家重点研发项目(2022YFD1900300) （2022YFD1900300）
国家自然科学基金项目(42077054,32071861) （42077054,32071861）
中央引导地方科技发展资金项目(2022ZY0210) （2022ZY0210）
