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基于静态箱法和气井法分别测定新疆棉田覆膜位置的土壤CO2通量和CO2浓度.结果表明:土壤CO2通量和CO2浓度时间变化特征与土壤温度变化趋势一致,均表现为7月较高,10月最低.观测期内,棉田土壤CO2累积排放量非覆膜处理为2032.81 kg C·hm-2,覆膜处理为1871.95 kg C·hm-2;而1 m深度内土壤CO2浓度非覆膜处理为2165~23986μL·L-1,覆膜处理为5137~25945μL·L-1,即覆膜减少了棉田土壤排放CO2的同时增加了土壤CO2积累量.覆膜和非覆膜处理下不同深度土壤CO2浓度和CO2通量的相关系数分别为0.60~0.73和0.57~0.75,表明地表释放的CO2强烈依赖于土壤剖面储存的CO2.覆膜和非覆膜处理下Q10值分别为2.77和2.48,表明覆膜处理下的土壤CO2通量对土壤温度变化的响应更敏感.
Soil CO2 flux and CO2 concentration were determined by static box method and gas well method respectively.The results showed that the temporal variation characteristics of soil CO2 flux and CO2 concentration were consistent with the trend of soil temperature, , And the lowest in October. During the observation period, the cumulative soil CO2 emissions from cotton fields were 2032.81 kg C · hm-2 and 1871.95 kg C · hm-2, respectively, while the soil CO2 concentrations within 1 m The film treatment was 2165 ~ 23986 μL·L-1, and the film treatment was 5137 ~ 25945 μL·L-1, that is, the film mulching reduced the soil CO2 emission and the soil CO2 accumulation at the same time. The correlation coefficients of soil CO2 concentration and CO2 flux were 0.60-0.73 and 0.57-0.75, respectively, suggesting that the surface CO2 release strongly depends on the CO2 stored in the soil profile.The Q10 values under and without film treatment were 2.77 and 2.48, respectively , Indicating that soil CO2 fluxes under plastic film mulching are more sensitive to soil temperature changes.