Cropland nitrous oxide emissions exceed the emissions of RCP 2.6: A global spatial analysis

文献类型： 外文期刊

第一作者： Tian, Xingshuai

作者： Tian, Xingshuai;Cong, Jiahui;Wang, Zihan;Chu, Yiyan;Wang, Yingcheng;Yin, Yulong;Cui, Zhenling;Wang, Hongye;Zheng, Huifang;Xue, Yanfang

作者机构： China Agr Univ, Natl Acad Agr Green Dev, Coll Resources & Environm Sci, Key Lab Plant Soil Interact,Minist Educ,Key Lab Lo, Beijing 100193, Peoples R China;Minist Agr & Rural Affairs, Cultivated Land Qual Monitoring & Protect Ctr, Beijing, Peoples R China;Henan Inst Sci & Technol, Sch Life Sci & Technol, Xinxiang 453003, Peoples R China;Shandong Acad Agr Sci, Maize Res Inst, Jinan 250023, Peoples R China

关键词： Cropland; EFs; N2O emission; Boundary; Exceedance

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 2022影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 858 卷

页码：

收录情况： SCI

摘要： Nitrous oxide (N2O), as a potent greenhouse gas, must be limited to prevent the global temperature increasing by >2 degrees C. Cropland is the largest source of anthropogenic N2O emissions; however, earlier estimates for emissions and their exceedances still remain uncertainties. Here, we used a spatially explicit model to estimate cropland N2O emis-sion in 2014 by refined grid-level crop-specific EFs and considered the background emission. We also sought to deter-mine where N2O emissions exceed the "boundary" through analysis of spatial data from representative concentration pathway (RCP) 2.6. The global cropland N2O emission was 2.92 +/- 0.59 Tg N yr-1, which far exceeds the 0.82 Tg N yr-1 boundary, over 90 % of cropland areas exceeded the boundary. Western Europe, Southeastern China, Pakistan, and the Ganges Plain exceeded the boundary by >2 kg N ha-1 yr-1. The boundary exceedances showed a positive linear response with respect to total cropland emission and a quadratic response to GDP per capita at the country level. Our study highlights the necessity of accurate estimations of spatial variations in cropland N2O emissions and evaluation of exceedances, to facilitate the development of more effective mitigation measures in different regions.

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