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Deriving Emission Factors and Estimating Direct Nitrous Oxide Emissions for Crop Cultivation in China

文献类型： 外文期刊

作者： Yue, Qian 1 ; Wu, Hua 1 ; Sun, Jianfei 1 ; Cheng, Kun 1 ; Smith, Pete 3 ; Hillier, Jon 4 ; Xu, Xiangrui 1 ; Pan, Genxing 1 ;

作者机构： 1.Nanjing Agr Univ, Inst Resource Ecosyst & Environm Agr, 1 Weigang, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Key Lab Crop & Anim Integrated Farming, Minist Agr & Rural Affairs, Recycling Agr Res Ctr, Nanjing 210014, Jiangsu, Peoples R China

3.Univ Aberdeen, Inst Biol & Environm Sci, Sch Biol Sci, Aberdeen AB24 3UU, Scotland

4.Univ Edinburgh, Global Acad Agr & Food Secur, Royal Dick Sch Vet Studies, Easter Bush Campus, Roslin EH25 9RG, Midlothian, Scotland

5.Univ Edinburgh, Roslin Inst, Easter Bush Campus, Roslin EH25 9RG, Midlothian, Scotland

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：9.028； 五年影响因子：9.922 ）

ISSN： 0013-936X

年卷期： 2019 年 53 卷 17 期

页码：

收录情况： SCI

摘要： Updating and refining the N2O emission factors (N2O-EFs) are vital to reduce the uncertainty in estimates of direct N2O emissions. Based on a database with 1151 field measurements across China, the N2O-EFs were established via three approaches including the maximum likelihood method, a linear regression with an intercept and a linear regression with the intercept set to 0 using 70% of the observations. The remaining 30% of the observations were then used to evaluate the predicted N2O-EFs. The third method had the highest R-2 of 0.39 and the best model efficiency of 0.38 with no significant bias, showing the best calculation efficiency. The results showed that the N2O-EFs varied with agroregions, crops, and management patterns. The agroregions of Huang-Huai-Hai and Yangtze River had the higher N2O-EFs in maize and wheat seasons than other regions, and the highest N2O-EFs of 0.66-0.92% in the rice season was found in the South and Southwest agroregions. Both fertilizer types and water regimes had the remarkable effects on N2O-EFs. Based on the best estimation by the selected method, direct N2O emissions from China's crop cultivation were estimated to be 194 Gg N2O-N with a 95% confidence interval of 180-208 Gg N2O-N in the year 2016.

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