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分析了常规耕作、免耕留高茬(30cm)、留中茬(20cm)、留低茬(10cm)四种处理下土壤呼吸速率、土壤温度和土壤含水量的变化特征。结果表明,4种处理土壤呼吸速率日变化和季节变化规律明显,均呈单峰曲线变化,土壤呼吸日变化峰值出现在14∶00～17∶00,日变化趋势受温度影响较大,变化幅度受土壤水分含量影响较大;季节变化的峰值出现在8月3日,整个生长季CO2平均排放速率影响表现为传统耕作>留低茬处理>留中茬处理>留高茬处理,各处理之间差异均达到显著水平(p<0.05);免耕留茬处理有很好的保温、保水作用,且随留茬高度的增加作用效果更加明显;土壤呼吸速率与0～10cm土壤含水量和0～5cm地温的相关性较大。
The changes of soil respiration rate, soil temperature and soil water content were analyzed under conventional tillage, no-tillage high stubble (30cm), middle stubble (20cm) stubble left stubble (10cm). The results showed that the diurnal and seasonal variations of soil respiration rate of the four treatments were obvious, showing a single peak curve, the peak diurnal variation of soil respiration occurred at 14:00 ~ 17:00, and the diurnal variation trend was greatly affected by temperature. The variation range Influenced by soil water content. The peak of seasonal variation appeared on August 3, and the effect of CO2 emission rate over the whole growing season was traditional tillage> left low stubble> left stubble> high stubble, (P <0.05). No-tillage and stubble treatment had better heat preservation and water retention effect, and the effect was more obvious with the increase of stubble height. Soil respiration rate was significantly correlated with 0-10 cm soil water content and 0 ~ 5cm greater correlation between ground temperature.