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为研究保护性耕作对后茬冬小麦土壤CO2和N2O排放的影响,在前茬进行常规耕作(T)、免耕(NT)、免耕+秸秆覆盖(NTS)、常规耕作+秸秆施用(TS)这4种处理,采用静态箱-气相色谱法分析土壤CO2和N2O排放通量.结果表明,保护性耕作没有改变后茬土壤CO2和N2O排放的季节性规律,对冬小麦生物量无明显影响;保护性耕作显著减少了土壤CO2和N2O累积排放量.与T相比,TS、NT、NTS的全生育期土壤CO2累积排放量分别降低了5.95%(P=0.132)、12.94%(P=0.007)和13.91%(P=0.004),土壤N2O累积排放量分别减少了31.23%(P=0.000)、61.29%(P=0.000)和33.08%(P=0.000).本研究表明免耕与秸秆施用能减少后茬作物生长季土壤的CO2和N2O排放量.
In order to study the effects of conservation tillage on soil CO2 and N2O emissions from following cropping of winter wheat, conventional tillage (T), no-tillage (NT), no-tillage + straw mulching (NTS), conventional tillage + straw application (TS) The results showed that tillage tillage did not change seasonal pattern of soil CO2 and N2O emissions after stubble and had no significant effect on the biomass of winter wheat. Tillage significantly reduced the cumulative emissions of soil CO2 and N2O. Compared with T, cumulative emissions of soil CO2 decreased by 5.95% (P = 0.132) and 12.94% (P = 0.007), respectively, And 13.91% (P = 0.004) respectively, and the cumulative N2O emissions in soil decreased 31.23% (P = 0.000), 61.29% (P = 0.000) and 33.08% Reduce CO2 and N2O emissions from stubble crop growing season.