CH 4 and N 2O emissions response to controlled irrigation of paddy fields

被引：0

作者：

Peng, Shizhang ^{[1
]}

Hou, Huijing ^{[1
,2
]}

Xu, Junzeng ^{[1
,2
]}

Yang, Shihong ^{[1
,2
]}

Mao, Zhi ^{[3
]}

机构：

[1] State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University

[2] College of Water Conservancy and Hydropower, Hohai University

[3] College of Water Resources and Hydroelectric Engineering, Wuhan University

来源：

Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | 2012年 / 28卷 / 13期

关键词：

CH [!sub]4[!/sub; Emission; Greenhouse effect; Irrigation; N [!sub]2[!/sub]O; Paddy fields; Water conservation;

D O I：

10.3969/j.issn.1002-6819.2012.13.020

中图分类号：

学科分类号：

摘要：

In order to study the effects of controlled irrigation on variations of CH 4 and N 2O emissions from paddy fields, CH 4 and N 2O emissions from paddy fields under controlled irrigation were investigated by the method of static chamber/gas chromatography. The results showed that CH 4 emissions from controlled irrigation paddy fields were lower than those from traditional irrigation paddy fields during most of the rice growing season. The high CH 4 emissions from controlled irrigation paddy fields were mainly observed during the former tillering period of rice, and the peaks were observed 1-2 days after soil dehydration. Compared with the traditional irrigation paddy fields, cumulative emission of CH 4 from controlled irrigation paddy fields reduced by 81.2%-82.8%. The N 2O emissions from controlled irrigation paddy fields were mostly higher than those from traditional irrigation paddy fields, and the peaks were observed 3-4 days after soil dehydration. Compared with the traditional irrigation paddy fields, cumulative emission of N 2O from controlled irrigation fields increased by 121.8%-144.3%. However, the integrative global warming potential of CH 4 and N 2O on a 100-year horizon was significantly decreased by 15.0%-34.8% in the controlled irrigation paddy fields (p<0.05). These results suggest that controlled irrigation can significantly mitigate the integrative greenhouse effect caused by CH 4 and N 2O from paddy fields.

引用

页码：121 / 126

页数：5

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