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采用定位试验,系统研究翻耕(T)、翻耕+秸秆还田(TS)、旋耕(RT)、旋耕+秸秆还田(RTS)、免耕(NT)、免耕+秸秆覆盖(NTS)6种不同耕作措施下土壤CO2排放速率的季节变化规律,分析土壤CO2排放速率与土壤水热的相互关系。结果表明,CO2排放速率有明显的季节变化规律,均表现为冬季低夏季高;整个生长季平均排放速率为TS>T>RTS>RT>NTS>NT,并且T、RT、NT 3种耕作措施之间差异均达到极显著水平(P<0.01);TS、RTS、NTS 3种有秸秆耕作措施的CO2排放速率均高于相应的T、RT、NT 3种无秸秆耕作措施,且T与TS之间差异达到极显著水平;土壤温度和CO2排放速率表现为极显著正相关,T、RT和NT分别与15、5、10 cm土层温度相关性最大,相关系数分别为0.899、0.779、0.934;土壤含水量与CO2排放速率未表现出显著相关性。
Positioning experiments were conducted to systematically study the effects of tillage, tillage, straw returning, tillage, RT, NT, NT and straw mulch NTS) under different tillage measures. The correlation between soil CO2 emission rate and soil water and heat was analyzed. The results showed that there were obvious seasonal variations of CO2 emission rates, both of which were low in summer and low in summer. The average emission rates during the whole growing season were TS> T> RTS> RT> NTS> NT, and T, RT and NT (P <0.01). The CO2 emission rates of three straw mulching measures TS, RTS and NTS were higher than the corresponding T, RT and NT without straw tillage, and T and TS The differences between soil temperature and CO2 emission were extremely significant positive correlations, T, RT and NT had the highest correlation with the temperature of 15, 5 and 10 cm soil layers respectively, the correlation coefficients were 0.899, 0.797 and 0.934 There was no significant correlation between soil water content and CO2 emission rate.