论文部分内容阅读
1995年5月15日～1997年5月15日两年在田间条件下研究我国西南地区冬水田甲烷排放量及耕种制度的影响。结果表明：冬水田水稻生长期甲烷排放通量在0．47～171．12mg／m2·h间，平均值达33．91mg／m2·h并且在每年长达250～280天的非水稻生长期内仍在排放甲烷，排放通量在2．51～54.52mg／m2·h间，平均为13.24mg／m2·h，使得冬水田甲烷年累积排放量高达165．82g／m2，是目前世界上各类稻区各类利用方式下甲烷排放量最大的一类稻田。与冬水田相比，半旱垄作（中稻）能减少甲烷年累积排放量3.36％和33．53％；而水稻生长期半旱垄作（稻麦）和水旱轮作（稻麦）甲烷排放通量比冬水田低34．11％和38．47％～66．65％，甲烷年累积排放量只占冬水田的36.7％和11．96％～34．27％。采用半旱垒作（稻麦）和水旱轮作（稻麦）是减少我国西南地区冬水田甲烷排放量最有效的方法之一。
From May 15, 1995 to May 15, 1997, the effects of methane emissions and cultivation systems on winter paddy fields in Southwest China were studied under field conditions for two years. The results showed that the average methane emission flux of rice in winter paddy field ranged from 0.47 to 171.12 mg / m 2 · h, with an average of 33.91 mg / m 2 · h. In the non-rice growth period of 250 to 280 days per year, The methane emission is still within the range of 2.51 ~ 54.52mg / m2 · h, with an average of 13.24mg / m2 · h, making the total annual methane emission in winter paddy field as high as 165.82g / m2, which is the highest in the world Various types of rice use of various types of methane emissions under the largest category of paddy fields. Compared with winter paddy field, semi-arid ridge (middle rice) can reduce annual cumulative methane emissions by 3.36% and 33.53%, while methane emission from semi-arid ridge crops (rice and wheat) and water and drought rotation (rice and wheat) 34.11% and 38.47% -66.65% lower than the winter paddy fields, respectively, and the cumulative annual methane emissions accounted for only 36.7% and 11.96% -34.27% of the winter paddy fields. It is one of the most effective ways to reduce the methane emission in winter paddy fields in Southwest China by using semi-dry base (rice and wheat) and water and drought rotation (rice and wheat).