放牧干扰对岷江上游山地森林-干旱河谷交错带土壤微生物量及呼吸熵的影响  

Effect of Grazing Disturbance on Soil Microbial Biomass and Respiratory Quotient in Mountain Forest of Arid Valley Ecotone in Upper Reaches of Minjiang River

作　　者：刘珊珊[1] 王芬[1] 张兴华[1] 宫渊波[1] 王燕[1] 尹艳杰 李渊[1] 马金松[1] 郭挺[1] 

机构地区：[1]四川农业大学长江上游林业生态工程四川省重点实验室,四川雅安625014

出　　处：《水土保持通报》2014年第2期63-68,共6页Bulletin of Soil and Water Conservation

基　　金：国家"十一五"科技支撑计划重大项目"长江中上游西南山区退化生态系统综合整治技术与模式"(2006BAC01A11-4);"十二五"科技支撑计划重大项目(2011BAC09B05);四川农业大学创新团队项目(林业生态工程)

摘　　要：选择岷江上游理县山地森林/干旱河谷交错带地区人工刺槐林、人工杨柳林、草地和锥花小檗灌丛这4种植被类型为研究对象,对4种植被下的土壤微生物量及呼吸熵对放牧干扰的响应进行了研究。以距牧道距离远近的不同设置了3种放牧干扰强度处理,分别对各植被类型3种放牧干扰强度的土壤进行了分析。结果表明,在各植被类型下,土壤有机碳（SOC）和土壤微生物量碳（MBC）含量随放牧干扰强度的增加而降低。各植被类型下表层土壤呼吸熵值（qCO2）值随放牧压力的增加而增大（除灌丛中度干扰外）,增加幅度为15.14%-100.54%,说明放牧干扰使微生物体的周转率加快,对SOC的利用率降低,释放的CO2增多,土壤碳保存率降低。This study focused on the responses of microbial biomass and respiratory quotient of 4vegetation types to grazing disturbance at the upper reaches of Minjiang River.These vegetations were Robinia pseudoacacia,Artificial Poplar,Grassland and Berberis shrub.Three grazing disturbance intensity were set with different distances from sample plots to grazing-path.Then analyzed soils under different treatments.The results showed that at different vegetation types,the values of soil organic carbon（SOC）and microbial biomass corbon（MBC）decreased with the increasing grazing intensity;the values of qCO2of surface soil increased by 15.14%-100.54% with the increase of grazing pressure（except moderate disturbance in shrubs）.These data illustrated that grazing disturbance accelerated the turnover rate of microorganisms,decreased the utilization rate of SOC,increased emission content of CO2and decreased preserving rate of soil carbon.

关 键 词：生态交错带 放牧干扰 土壤微生物量 呼吸熵 

分 类 号：S154.3[农业科学—土壤学] S152[农业科学—农业基础科学]