喀斯特峡谷区不同恢复阶段土壤微生物量及呼吸商  

Soil Microbial Biomass,Respiration,and Metabolic Quotient Under Different Vegetation Restoration Stages in Karsts Gorge District

作　　者：崔晓晓[1] 罗惠宁 俞元春[1] 舒洪岚[3] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037 [2]贵州省林业对外合作项目管理中心,贵州贵阳550001 [3]江西财经大学,江西南昌330032

出　　处：《水土保持学报》2011年第5期117-120,139,共5页Journal of Soil and Water Conservation

基　　金：国家林业公益性行业科研专项(200804040);国家自然科学基金项目(30872076);中央财政林业科技推广示范资金项目(2010TK57)

摘　　要：土壤微生物生物量、土壤微生物呼吸及微生物商值(微生物商qMB、微生物呼吸商qCO2)是土壤质量的敏感性指标。对喀斯特峡谷区不同植被恢复阶段土壤微生物生物量、土壤微生物呼吸及其qMB、qCO2进行研究,结果表明:在植被恢复过程中,土壤微生物生物量、土壤微生物呼吸及qMB均表现为从退耕地到草本群落下降,从草本到灌木群落上升,从灌木到乔木群落略微上升或者趋于稳定;qCO2的变化规律与它们相反。在同一恢复阶段,土壤微生物生物量,土壤微生物呼吸,qMB值均随土层加深而减小。土壤微生物生物量、微生物呼吸及其qMB、qCO2与土壤总有机碳、全氮、全磷具有显著的线性相关关系(p<0.05),可用来评价土壤质量。Soil microbial biomass,respiration,and metabolic quotient are the sensitive indicators of soil quality.Soil microbial biomass,basal respiration,qMB and qCO2 under different vegetation restoration stages,including herbaceous community,shrubby community,arboreal community stage and comparison slope farmland,in Karst gorge district of Guizhou province were studied.The results showed that microbial biomass,basal respiration and qMB decreased from slope farmland to herbaceous community,and increased from herbaceous community to arboreal community.From shrubby community to arboreal community,all indices had no obvious changes.But qCO2 had a counteractive effect on them.In the same vegetation restoration stages,microbial biomass,basal respiration and qMB decreased with increasing of soil depth.Soil microbial biomass,respiration,qMB,and qCO2 had significant linear correlations with soil total organic carbon,total nitrogen,and total phosphorous（p0.05）,they could be used as the good indicators soil quality evaluation.

关 键 词：喀斯特峡谷区 不同恢复阶段 土壤微生物量 土壤基础呼吸 

分 类 号：S154.3[农业科学—土壤学] S718.5[农业科学—农业基础科学]