水土保持学报2024，Vol.38Issue(3)：306-313,8.DOI:10.13870/j.cnki.stbcxb.2024.03.009
放牧强度对荒漠草原土壤微生物群落特征的影响
Effects of Grazing Intensity on Soil Microbial Community Characteristics in Desert Steppe
摘要
Abstract
[Objective]Investigating the response mechanism of soil microbial communities to changes in grazing intensity can provide scientific theoretical and technical support for ecological protection and restoration of desert steppe.[Methods]Taking the desert steppe in Inner Mongolia as the research object,we studied the effects of different grazing intensities(no grazing,light grazing,medium grazing,and high grazing)on soil physicochemical properties and the composition and diversity of soil microbial communities at different soil depths(0-20 cm and 20-40 cm),the interactions between soil physicochemical properties and soil microbial communities were analyzed.[Results]Compared to no grazing,medium grazing significantly(p＜0.05)reduced the soil total nitrogen(TN)content(by 17.99％)and soil organic carbon(TOC)content(by 19.23％)at 0-20 cm depth.The maximum value of soil bulk density(SBD)appeared under high grazing conditions.The soil physicochemical properties at 20-40 cm depth showed no differences(p＞0.05)under different grazing intensities.In addition,grazing decreased the abundance and diversity of bacterial communities at 20-40 cm depth,while increased the abundance and diversity of bacteria communities at 20-40 cm depth.Under light and moderate grazing conditions,the abundance and diversity of soil fungal communities at 0-20 cm depth increased,with no significant effect(p＞0.05)on the abundance and diversity of soil fungal communities at 20-40 cm depth.[Conclusion]Mantel tests showed that total nitrogen of desert steppe soil was the primary factor influencing the change of desert steppe soil bacterial abundance with grazing intensity.The research results contribute to understanding the ecological sensitivity of soil microbes and offer scientific guidance for achieving sustainable management in desert steppe ecosystems.关键词
荒漠草原/放牧强度/土壤微生物/土壤理化性质Key words
desert steppe/grazing intensity/soil microorganisms/soil physicochemical properties分类
农业科技引用本文复制引用
张蒙蒙,徐国策,张铁钢,方康,拓梦瑶,万顺,王斌..放牧强度对荒漠草原土壤微生物群落特征的影响[J].水土保持学报,2024,38(3):306-313,8.基金项目
国家重点研发计划项目(2022YFF1300803) （2022YFF1300803）
中国水利水电科学研究院内蒙古阴山北麓草原生态水文国家野外科学观测研究站开放研究基金项目(YSS202113) （YSS202113）
国家自然科学基金项目(42167007) （42167007）
内蒙古自治区科技成果转化项目(2021CG0012) （2021CG0012）
