中国草地学报2025，Vol.47Issue(8)：86-95,10.DOI:10.16742/j.zgcdxb.20240447
青藏高原高寒草甸土壤微生物生物量对放牧强度的响应
Responses of Soil Microbial Biomass to Grazing Intensities in Alpine Meadow of Qinghai-Tibet Plateau
摘要
Abstract
To explore the effects of different grazing intensities on soil microbial biomass in alpine meadow,this study investigated the variation characteristics in soil microbial biomass and interactions between soil physicochemical properties and microbial parameters including biomass,microbial quotient,and stoichiometric ratios under no grazing(CK),light grazing(LG),moderate grazing(MG),heavy graz-ing(HG),and extreme grazing(EG)conditions in the alpine meadow of Tianzhu Zangzu Autonomous County on the northeastern edge of the Qinghai-Tibet Plateau.The results showed that both microbial bio-mass carbon(MBC)and phosphorus(MBP)reached the maximum levels under LG,which were signifi-cantly higher compared with EG condition(P<0.05).Soil microbial biomass nitrogen(MBN)was high-est under HG,followed by MG,while MBN was significantly lower under EG compared with HG(P<0.05).Soil microbial quotient carbon(q MBC),microbial quotient phosphorus(q MBP)and the MBC∶MBN ratio were all highest under LG,whereas microbial quotient nitrogen(q MBN),MBC∶MBP ratio,and MBN∶MBP ratio were highest under MG.Soil bulk density emerged as the predominant factor influ-encing microbial biomass,microbial quotients,and their stoichiometric ratios.These findings indicate that both light and moderate grazing intensities benefit the accumulation of microbial biomass and promote effi-cient utilization and transformation of soil nutrient in alpine meadows.In contrast,extreme grazing leads to soil fertility decreasing and a reduction of microbial biomass.A win-win scenario of ecology sustainability and economic benefits will be achieved when apporiate grazing intensities adopted.关键词
高寒草甸/放牧强度/土壤微生物生物量/化学计量比/微生物熵Key words
Alpine meadow/Grazing intensities/Soil microbial biomass/Stoichiometric ratio/Micro-bial quotient分类
农业科技引用本文复制引用
罗薇薇,林栋,花欣颖,刘雪鹏,包志鹏,宋一诺..青藏高原高寒草甸土壤微生物生物量对放牧强度的响应[J].中国草地学报,2025,47(8):86-95,10.基金项目
甘肃省自然科学基金项目(20JR10RA525) （20JR10RA525）
国家自然科学基金项目(32260354) （32260354）
兰州市青年科技人才创新项目(2023-QN-46) （2023-QN-46）
草业生态系统教育部重点实验室开放课题(KLGE202209) （KLGE202209）
