作　　者： ; ; ;

机构地区： 甘肃农业大学资源与环境学院

出　　处： 《土壤通报》 2013年第1期57-63,共7页

摘　　要： 基于甘肃农业大学在定西市李家堡镇开展的保护性耕作长期定位试验,采用CO2分析仪、静态箱-气相色谱法对2011年度不同耕作措施下豆麦双序列轮作农田土壤CO2和N2O的排放通量进行全年连续观测。结果表明:测定期内不同耕作措施下豆麦双序列轮作农田土壤均表现为CO2源和N2O源;免耕不覆盖有利于降低两个序列土壤的CO2排放通量,免耕秸秆覆盖、免耕不覆盖和传统耕作+秸秆还田三种保护性耕作处理不同程度的减少了两个序列土壤的N2O排放通量;两个序列下CO2的相对增温潜势最大,W→P→W序列传统耕作+秸秆还田处理对温室效应贡献最多,相反免耕不覆盖处理能相对减少温室气体排放量,从而降低温室效应;P→W→P序列传统耕作不覆盖处理对温室效应的贡献最大,传统耕作+秸秆还田处理对温室效应贡献最小,对温室气体有减排效应。 Based on long-term conservation tillage experiment in Lijiabu Town of Dingxi City conducted by Gansu Agricultural University, C02 and N20 emission fluxes in pea-wheat double sequence rotation fields under different tillage treatments [conventional tillage with no straw （T）, no-tillage with no straw mulching （NT）, conventional with straw mulching （TS） and no-tillage with straw mulching （NTS）] during 2011 were measured by carbon dioxide analyzer and static chamber-gas chromatographic techniques. The results showed that fields with pea-wheat double sequence rotation were sources of atmospheric CO2 and N20 during determination period. Compared with T, NT retarded CO2 emission and three conservation tillage methods including NTS, NT and TS reduced N20 emission. Two sequences led to the most CO2 emission and the highest GWP of CO2. The contribution of ouse effect in W-~ P--~W sequence mainly attributed to TS treatment and little attributed to NT treatment. In P-＊W--P sequence, it mainly attributed to T treatment and little attributed to TS treatment.

关 键 词： 耕作措施 双序列轮作 温室气体 排放通量 全球增温潜势

领　　域： [农业科学] [农业科学]