中文摘要：

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.

英文摘要：

In order to study the effect of conservation tillage on soil CO2and N2O emissions in the following crop-growing season,field experiments were conducted in the winter wheat-growing season. Four treatments were conventional tillage（ T）,no-tillage with no straw cover（ NT）,no-tillage with straw cover（ NTS）,and conventional tillage with straw incorporation（ TS）,respectively. The CO2and N2O fluxes were measured using a static chamber-gas chromatograph technique. The results showed that in the following winter wheatgrowing season,conservation tillage did not change the seasonal pattern of CO2and N2O emission fluxes from soil,and had no significant effect on crop biomass. Conservation tillage significantly reduced the accumulative amount of CO2and N2O. Compared with the T treatment,the accumulative amount of CO2under TS,NT,and NTS treatments were reduced by 5. 95%（ P = 0. 132）,12. 94%（ P =0.007）,and13.91%（ P =0.004）,respectively,and the accumulative amount of N2O were significantly reduced by 31. 23%（ P= 0. 000）,61. 29%（ P = 0. 000）,and 33. 08%（ P = 0. 000）,respectively. Our findings suggest that conservation tillage significantly reduced CO2and N2O emission from soil in the following winter wheat-growing season.