不同耕作措施对冬小麦田CO_2排放通量的影响

Effects of different tillage measures on the CO_2 emission flux from winter wheat field

在甘肃省石羊河绿洲灌区连续4 a冬小麦保护性耕作田间定位试验的基础上,用静态箱-气相色谱法研究了5种耕作措施下,冬小麦田从前季灌浆期到后季分蘖期期间CO2排放通量的变化规律.结果表明：不同耕作措施下,CO2排放通量在观测期内呈现“高-低-高”的双峰型变化曲线;秸秆翻压处理CO2排放通量最高,传统耕作CO2排放通量介于免耕不覆盖处理和秸秆翻压处理之间;传统耕作与免耕不覆盖两处理CO2排放通量间差异性显著;CO2排放通量与耕层（0～30 cm）土壤温度和土壤含水量呈显著正相关,其中土壤含水量对CO2排放通量的影响大于土壤温度对其的影响.

Based on the four years field experiment on winter wheat with different tillage measures in Hexi Oasis Irrigation Area, the variations of CO2 emission flux form five winter wheat fields under different tillage measures during former filling stage to later tillering stage were measured by static chamber-gas chromatographic techniques. The results were as follows： during observation period, the CO2 emission flux under different tillage measures showed bimodal curve; the CO2 emission flux of conventional tillage with stubble incorporated（TIS） was higher than any other treatments;the CO2 emission flux of conventional tillage（T）was lower than that of conventional tillage with stubble ineorporated（TIS）, but higher than that of no-tillage without stubble retention（NT）, significant differences of CO2 emission flux were found between the conventional tillage（T）and no-tillage without stubble retention（NT） ; the CO2 emission flux in the 0～30 cm soil layer was significantly correlated to the soil moisture and soil temperature.