不同利用方式对贝加尔针茅草原土壤活性有机碳的影响  

Effects of different land-use patterns on soil active organic carbon in Stipa baicalensis steppe in Inner Mongolia

作　　者：荆佳强 萨仁其力莫格 秦洁 张海芳 李明 杨殿林 JING Jia-qiang;SA Ren-qi-li-mo-ge;QIN Jie;ZHANG Hai-fang;LI Ming;YANG Dian-lin(College of Horticulture,Shenyang Agriculture University,Shenyang 110866,China;Agro-environment Protection Institute Ministry of Agriculture and Rural Affairs,Tianjin 300191,China)

机构地区：[1]沈阳农业大学园艺学院,辽宁沈阳110866 [2]农业农村部环境保护科研监测所,天津300191

出　　处：《草业学报》2022年第1期47-56,共10页Acta Prataculturae Sinica

基　　金：国家自然科学基金项目(41877343)资助。

摘　　要：土壤活性有机碳能够准确反映土壤有效性,表征土壤质量变化,是探索可持续草地管理措施的关键指标之一。以内蒙古贝加尔针茅草原为研究对象,采用围封、放牧和刈割野外控制试验,探讨不同利用方式对土壤有机碳(SOC)和活性有机碳的影响,发现不同利用方式下土壤SOC含量表现为围封>刈割>放牧,其中围封区和刈割区土壤SOC含量显著大于放牧区,围封区与刈割区土壤SOC含量差异不显著,在土壤活性有机碳中土壤可溶性有机碳(DOC)含量表现为放牧>围封>刈割。土壤微生物量碳(MBC)和土壤易氧化有机碳(ROC)含量均表现为围封>刈割>放牧,围封区与刈割区土壤MBC和土壤ROC平均含量差异不显著,且均显著大于放牧区。土壤MBC、ROC和SOC之间呈极显著相关性(P<0.01)。土壤ROC和土壤MBC与土壤全氮和土壤全磷呈极显著相关性(P<0.01)。围封与刈割有利于土壤SOC、MBC、ROC的提升,放牧对土壤DOC有一定累积作用。围封和刈割增强了土壤SOC的稳定性,活性有机碳与土壤有机碳和土壤理化性质密切相关,能够敏感地反映土壤有机碳的变化。Soil active organic carbon can accurately reflect soil nutrient availability and characterize changes in soil quality.It is one of the key indicators for research into sustainable grassland management measures.Here we report a field experiment carried out on Stipa baicalensis steppe in Inner Mongolia,in which grazing,grazing exclusion(i.e.enclosure)and mowing treatments were used to explore the effects of the different land use patterns on soil organic carbon(SOC)and active organic carbon.It was found that SOC content,soil microbial biomass carbon(MBC)content and soil readily oxidizable organic carbon(ROC)content under the different land use patterns all ranked:grazing exclusion>mowing>grazing.The ranking for soil dissolved organic carbon(DOC)content was grazing>exclusion>mowing.There was a very significant correlation between soil MBC,ROC and SOC(P<0.01).Soil ROC and MBC were significantly correlated with total nitrogen and total phosphorus(P<0.01).Grazing exclusion and mowing promoted the improvement of soil SOC,MBC and ROC,and grazing had an accumulative effect on DOC.Grazing exclusion and mowing enhanced the stability of soil SOC.Active organic carbon was closely related to soil organic carbon and soil physical and chemical properties and sensitively reflected changes in the level of soil organic carbon.

关 键 词：土壤活性有机碳 围封 放牧 刈割 贝加尔针茅草原 

分 类 号：S812.2[农业科学—草业科学]