草业学报2018，Vol.27Issue(1)：22-31,10.DOI:10.11686/cyxb2017112
放牧强度对若尔盖高寒草甸土壤有机质和微生物的影响
Effects of grazing intensity on soil organic matter and microorganisms in the Zoige alpine meadow
摘要
Abstract
Human activities have significantly affected the structure and function of the Zoige alpine meadow ecosystem.In this study,we analyzed the effects of grazing intensity on soil organic matter (SOM) and the soil microbial community in the Zoige alpine meadow.Five grazing intensity treatments,which were based on vegetation coverage,were established:D1,coverage of 0％-20％;D2,coverage of 20％-40％;D3,coverage of 40％-60％;D4,coverage of 60％-80％;D5,coverage of 80％-100％.The SOM and total nitrogen content at 0-10 cm soil depth significantly differed among the five grazing intensity treatments (P＜0.05).With increasing grazing intensity,the amounts of bacteria,fungi,actinomycetes,and Gram-positive (G+) and Gramnegative bacteria (G-) decreased.The highest ratio of G+/G-was in D3,while the lowest was in D4.The microbial diversity index decreased in the following order:D5＞D4＞D1＞D2＞D3.The diversity index was calculated from the soil phospholipid fatty acid profiles,and did not differ significantly among the five grazing intensity treatments (P＞0.05).The soil microbe content was significantly positively correlated with SOM content.The grazing intensity was closely related not only to the productivity of the alpine meadow,but also to SOM and microbial communities.Therefore,it is important to restore and maintain soil productivity by controlling the grazing intensity in this region.关键词
放牧干扰/土壤有机质/土壤微生物/物种多样性Key words
grazing intensity/soil organic matter/soil microbial/species diversity引用本文复制引用
常晶晶,徐丽,薛晶月,杨浩,何念鹏,张晋京..放牧强度对若尔盖高寒草甸土壤有机质和微生物的影响[J].草业学报,2018,27(1):22-31,10.基金项目
国家自然科学基金面上项目(31470506)资助. （31470506）
