不同耕作方式和秸秆还田对麦田土壤有机碳含量的影响  

Effects of different tillage methods and straw-returning on soil organic carbon content in a winter wheat field

作　　者：田慎重[1] 宁堂原[1] 王瑜[1] 李洪杰[1] 仲惟磊[1] 李增嘉[1] 

机构地区：[1]山东农业大学农学院作物生物学国家重点实验室,山东泰安271018

出　　处：《应用生态学报》2010年第2期373-378,共6页Chinese Journal of Applied Ecology

基　　金：国家"十一五"科技支撑计划项目(2006BAD15B07;2007BAD89B09-9);公益性行业(农业)科研专项(200803028);山东省资源节约型社会专项(2006JY06)资助

摘　　要：通过两个生长季试验,研究了不同耕作方式和秸秆还田及其交互效应对小麦全生育期0～20cm土壤有机碳含量的影响.结果表明:小麦不同生育时期0～20cm土层有机碳含量呈明显的动态变化;秸秆还田各处理的有机碳含量都高于无秸秆还田处理;保护性耕作措施土壤有机碳增加量显著高于传统翻耕.除传统翻耕处理外,各处理0～10cm土层的有机碳含量都高于10～20cm土层,秸秆还田各处理0～10cm土层有机碳含量表现为深松(PS)>旋耕(PR)>免耕(PZ)>耙耕(PH)>传统翻耕(PC),而10～20cm土层表现为传统翻耕(PC)>深松(PS)>旋耕(PR)>耙耕(PH)>免耕(PZ),说明保护性耕作措施能提高0～10cm土层的有机碳含量.多因素方差分析表明:耕作因素、秸秆因素和两者交互效应在不同生育期对0～20cm土层的有机碳含量都有显著影响.A two growth seasons experiment was conducted to study the effects of different tillage methods,straw-returning,and their interaction on the dynamic change of organic carbon content in 0-20 cm soil layer during the whole growth period of winter wheat.An obvious change was observed in the soil organic carbon content.Treatments with straw-returning had higher soil organic carbon content than treatments with no straw-returning,and conservation tillage induced higher soil organic carbon content than conventional tillage.In all treatments except conventional tillage,the organic carbon content in 0-10 cm soil layer was higher than that in 10-20 cm soil layer.In treatments with straw-returning,the organic carbon content in 0-10 cm soil layer decreased in order of deep soiling（PS）〉rotary tillage（PR）〉no tillage（PZ）〉normal ploughing（PH）〉conventional tillage（PC）,while that in 10-20 cm soil layer was PC〉PS〉PR〉PH〉PZ,suggesting that conservation tillage could improve the organic carbon content in 0-10 cm soil layer.Multi factor variance analysis showed that tillage method,straw-returning,and their interaction had significant effects on the organic carbon content in 0-20 cm soil layer at various growth stages of winter wheat.

关 键 词：保护性耕作 秸秆还田 土壤有机碳 冬小麦 

分 类 号：S154[农业科学—土壤学]