Sewage irrigation increased methane and nitrous oxide emissions from rice paddies in southeast China
文献类型: 外文期刊
作者: Zou, Jianwen 1 ; Liu, Shuwei 1 ; Qin, Yanmei 1 ; Pan, Genxing 1 ; Zhu, Dawei 2 ;
作者机构: 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China
关键词: Agrochemicals;Developing countries;Domestic Agrochemicals;Developing countries;Domestic wastes;Ecosystems;Effluents;Emissions;Fertilizers;Greenhouse gases;Irrigation;Methane;Nitrous oxide;Rice fields;Rivers;Seasonal variations;Sewage;Sulfur dioxide;Water regimes;agriculture;irrigation water;logging;Oryza sativa;China;People's Rep.
期刊名称:AGRICULTURE ECOSYSTEMS & ENVIRONMENT ( 影响因子:5.567; 五年影响因子:6.064 )
ISSN:
年卷期:
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收录情况: SCI
摘要: Greenhouse gas emissions from rice paddies under sewage irrigation deserve much attention since domestic sewage effluents are increasingly used for agriculture in developing countries. A field experiment was conducted to simultaneously measure methane (CH sub(4)) and nitrous oxide (N sub(2)O) emissions from rice (Oryza sativa L.) paddies under sewage and unpolluted river water irrigation in southeast China. The rice paddies were under a local typical water regime, which was characterized by flooding-midseason drainage-reflooding-moist intermittent irrigation but without water logging. Relative to unpolluted river water irrigation, sewage irrigation significantly increased CH sub(4) and N sub(2)O emissions from rice paddies. Seasonal fluxes of CH sub(4) averaged 1.51mgm super(-) super(2)h super(-) super(1) for the plots irrigated by river water and 1.92mgm super(-) super(2)h super(-) super(1) for the plots irrigated by sewage. In contrast with river water irrigation, sewage irrigation increased CH sub(4) by 27% and 33% for paddy plots with and without chemical N addition, respectively. Under sewage irrigation, seasonal fluxes of N sub(2)O-N averaged 26.79 mu gm super(-) super(2)h super(-) super(1) for the plots without N application and 74.07 mu gm super(-) super(2)h super(-) super(1) for the plots applied at the rate of 200kgNha super(-) super(1). Relative to river water irrigation, sewage irrigation increased N sub(2)O by 68% and 170% for the plots with and without N application, respectively. The direct emission factor of fertilizer N for N sub(2)O was estimated to be 0.71% for the rice paddies under sewage irrigation and 0.52% for the plots irrigated by river water. Besides direct N sub(2)O emissions, N input by sewage irrigation induced substantial indirect N sub(2)O emission from rice paddies. The results of the net GWPs from CH sub(4) and N sub(2)O indicate that sewage irrigation would intensify the radiative forcing of rice paddies with midseason drainage and moist irrigation.
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