摘要
为探讨不同耕作方式对旱作玉米田土壤CO_2排放量的影响,设置深松耕(DT)、翻耕(PT)和免耕(NT)3个处理,分析3种耕作方式下土壤CO_2排放量的动态变化及其与土壤温度和土壤水分间的关系。结果显示:2010-2011年夏玉米生长季,3种耕作方式下土壤CO_2排放量均呈先增后降的变化趋势,表现为DT>PT>NT,且不同处理间差异显著(P<0.05);耕作方式可显著影响夏玉米生育前期土壤温度,且土壤CO_2排放量对不同耕作方式下土壤温度的敏感性不同,土壤温度分别可以解释PT、DT和NT处理土壤CO_2排放量季节变化的50.72%~53.90%、48.10%~59.63%和13.31%~19.90%;土壤水分和温度共同分别可以解释旱作夏玉米田DT和PT处理下土壤CO_2排放量季节变化的57.61%~76.83%和56.62%~67.12%。土壤温度和水分是影响旱作农田DT和PT处理下土壤CO_2排放量的关键因素。
An experiment was conducted to explore the effects of different tillages on soil CO_2 flux,and its relation to soil moisture and soil temperature in dry-land maize field. Summer maize was planted using three different tillages,including deep tillage( DT),plow tillage( PT) and no tillage( NT). The results indicated that soil CO_2 flux was first increased and then decreased in all 3 tillage systems during the whole maize growth period in 2010-2011,the miximum of soil CO_2 flux was DT,follwed by PT,and NT,and there was significant difference between different treatments( P<0.05). The effect of tillage system on soil temperature are more significant at early stage than at later stage. There was difference in the temperature sensitivity of soil CO_2 flux in different tillages,Soil temperature could explain 50.72% ~ 53.90%,48.10% ~ 59.63% and 13.31% ~ 19.90% seasonal variation of soil CO_2 flux under PT,and DT and NT treatments. Soil temperature and soil moisture could explain 57.61% ~ 76.83% and56.62% ~ 67.12% seasonal variations of soil CO_2 flux under DT and PT treatments,indicating that soil temperature and soil moisture are the key factors affecting soil CO_2 flux under DT and PT treatments in dry-land maize field.
引文
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