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采用定位试验,系统研究翻耕(CT)、旋耕(RT)、免耕不覆盖(NT)3种不同耕作措施下土壤CO2排放速率,并对CO2排放速率和10cm土壤温度进行回归模拟。结果表明:夏玉米生育期CO2排放速率表现为翻耕(CT)>旋耕(RT)>免耕不覆盖(NT),平均分别为585.675、457.875和184.95mg·m-2·h-1。并且3种耕作措施之间差异均达到显著水平(P<0.05);各处理夏玉米生育期CO2排放速率与土壤温度呈显著正相关;NT、RT和CT处理CO2排放速率与10cm地温相关系数分别为0.624、0.609和0.606。CO2排放速率和土壤温度呈指数函数关系(P<0.05),利用10cm地温对夏玉米生育期农田CO2排放通量进行估算表明,CT、RT和NT处理CO2排放量分别为1.47、1.15和0.46kg·m-2。
Positioning experiments were conducted to study the effects of tillage (CT), rotary tillage (RT) and no tillage (NT) on soil CO2 emission rates under different tillage measures. The CO2 emission rate and 10 cm soil temperature were simulated by regression analysis. The results showed that the CO2 emission rate during summer maize growth was CT> RT> NT, with an average of 585.675, 457.875 and 184.95 mg · m-2 · h-1, respectively. (P <0.05). There was a significant positive correlation between CO2 emission rate and soil temperature during the growth of summer maize. Correlation coefficients between CO2 emission rate and 10 cm temperature of NT 0.624, 0.609 and 0.606. The CO2 emission rate and soil temperature showed an exponential function (P <0.05). Estimation of the CO2 emission flux from the summer maize growth stage using 10 cm ground temperature showed that the CO2 emissions of CT, RT and NT were 1.47, 1.15 and 0.46 kg · M-2.