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当前位置: 首页 > 文章 > The effects of nitrogen fertilizer application on methane and nitrous oxide emission/uptake in Chinese croplands 农业科学学报 (英文) 2016,15 (2)
Position: Home > Articles > The effects of nitrogen fertilizer application on methane and nitrous oxide emission/uptake in Chinese croplands Journal of Integrative Agriculture 2016,15 (2)

The effects of nitrogen fertilizer application on methane and nitrous oxide emission/uptake in Chinese croplands

作  者：
Sun Bin-feng;Zhao Hong;Lu Yi-zhong;Lu Fei;Wang Xiao-ke
单  位：
Univ Chinese Acad Sci, Beijing 100049, Peoples R China;China Agr Univ, Coll Resources & Environm, Beijing 100193, Peoples R China;Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
关键词：
nitrogen fertilizer;methane;nitrous oxide;global warming potential;emission factor
摘  要：
The application of nitrogen (N) fertilizer to increase crop yields has a significant influence on soil methane (CH4) and nitrous oxide (N2O) emission/uptake. A meta-analysis was carried out on the effect of N application on (i) CH4 emissions in rice paddies, (ii) CH4 uptake in upland fields and (iii) N2O emissions. The responses of CH4 emissions to N application in rice paddies were highly variable and overall no effects were found. CH4 emissions were stimulated at low N application rates (<100 kg N ha(-1)) but inhibited at high N rates (>200 kg N ha(-1)) as compared to no N fertilizer (control). The response of CH4 uptake to N application in upland fields was 15% lower than control, with a mean CH4 uptake factor of 0.001 kg CH4-C kg(-1) N. The mean N2O emission factors were 1.00 and 0.94% for maize (Zea mays) and wheat (Triticum aestivum), respectively, but significantly lower for the rice (Oryza sativa) (0.51%). Compared with controls, N addition overall increased global warming potential of CH4 and N2O emissions by 78%. Our result revealed that response of CH4 emission to N input might depend on the CH4 concentration in rice paddy. The critical factors that affected CH4 uptake and N2O emission were N fertilizer application rate and the controls of CH4 uptake and N2O emission. The influences of application times, cropping systems and measurement frequency should all be considered when assessing CH4 and N2O emissions/uptake induced by N fertilizer.
作  者：
SUN Bin-feng;ZHAO Hong;L Yi-zhong;LU Fei;WANG Xiao-ke;State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences;University of Chinese Academy of Sciences;College of Resources and Environment,China Agricultural University;
关键词：
nitrogen fertilizer;;methane;;nitrous oxide;;global warming potential;;emission factor
摘  要：
The application of nitrogen(N) fertilizer to increase crop yields has a significant influence on soil methane(CH_4) and nitrous oxide(N_2O) emission/uptake.A meta-analysis was carried out on the effect of N application on(i) CH_4 emissions in rice paddies,(ii) CH_4 uptake in upland fields and(iii) N_2O emissions.The responses of CH_4 emissions to N application in rice paddies were highly variable and overall no effects were found.CH_4 emissions were stimulated at low N application rates(<100 kg N ha~(-1)) but inhibited at high N rates(>200 kg N ha~(-1)) as compared to no N fertilizer(control).The response of CH_4 uptake to N application in upland fields was 15%lower than control,with a mean CH_4 uptake factor of-0.001 kg CH_4-C kg~(-1) N.The mean N_2O emission factors were 1.00 and 0.94%for maize(Zea mays) and wheat(Triticum aestivum),respectively,but significantly lower for the rice(Oryza sativa)(0.51%).Compared with controls,N addition overall increased global warming potential of CH_4 and N_2O emissions by 78%.Our result revealed that response of CH_4 emission to N input might depend on the CH_4concentration in rice paddy.The critical factors that affected CH_4 uptake and N_2O emission were N fertilizer application rate and the controls of CH_4 uptake and N_2O emission.The influences of application times,cropping systems and measurement frequency should all be considered when assessing CH_4 and N_2O emissions/uptake induced by N fertilizer.

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