耕种制度对西南地区冬水田甲烷排放的影响
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* 国家自然科学基金项目(49771073);中国科学院重点资助项目(KZ952-J1-203)


EFFECTS OF TILLAGE-CROPPING SYSTEMS ON METHANE EMISSIONS FROM YEAR-ROUND FLOODED PADDY FIELD IN SOUTHWEST CHINA
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    摘要:

    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。

    Abstract:

    Fluxes of methane emission from the year-round flooded paddy field and tillage-cropping systems effects were investigated for two years from 15 May 1995 to 15 May 1997 in field in Southwest China. The results showed that fluxes of methane emission from the year-round flooded paddy field during the rice growing seasons varied from 0.47 mg/m2·h to 171.12 mg/m2·h, and averaged 33.91mg/m2·h. But, it was the most important and the most remarkable that there were 2.51~54.42mg/m2·h of methane emission fluxes, averagely 13.24mg/m2·h during the nonrice growing season from 250 days to 280 days yearly. So, the year-round flooded paddy field with 165.82g/m2·a of methane emission flux was the one of largest methane emission flux in varieties of paddy fields in the world now. The ridge culture (semilate rice) could reduce yearly methane emission fluxes in rice paddy field by 3.36% in 1995 and 33.53% in 1996 compared with the year-round flooded paddy field. The mean fluxes of methane emission in the paddy fields under the ridge culture (rice-wheat) system and under the paddy-upland (rice-wheat) rotation system during the rice growing seasons were lower than those under year round flooded paddy field, and yearly fluxes of methane emission only accounted for 36.7% and 11.96%-34.27% of those under year-round flooded paddy field at the sametime. The ridge culture (rice-wheat) system and the paddy-upland (rice-wheat) system were one of the most effective methods for reducing flux of methane emission from the year-round flooded paddy field in Southwest China.

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魏朝富,高明,黄勤,车福才,杨剑虹,谢德体,蔡祖聪,徐华.耕种制度对西南地区冬水田甲烷排放的影响[J].土壤学报,2000,37(2):157-165. DOI:10.11766/trxb199901190202 Wei Chao-fu, Gao Ming, Huang Qin, Che Fu-Cai, Yang Jian-hong, Xie De-ti, Cai Zu-cong, Xu Hua. EFFECTS OF TILLAGE-CROPPING SYSTEMS ON METHANE EMISSIONS FROM YEAR-ROUND FLOODED PADDY FIELD IN SOUTHWEST CHINA[J]. Acta Pedologica Sinica,2000,37(2):157-165.

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  • 收稿日期:1999-01-19
  • 最后修改日期:1999-07-25
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  • 在线发布日期: 2013-02-25
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