文献类型：期刊文献

英文题名：Central Role of Nitrogen Fertilizer Relative to Water Management in Determining Direct Nitrous Oxide Emissions From Global Rice-Based Ecosystems

作者：Song, Hanxiong[1] Zhu, Qiuan[2] Blanchet, Jean-Pierre[1] Chen, Zhi[3] Zhang, Kerou[4] Li, Tong[5] Zhou, Feng[6] Peng, Changhui[1,5]

第一作者：Song, Hanxiong

通信作者：Peng, CH[1];Peng, CH[2]

机构：[1]Univ Quebec Montreal, Inst Sci Environm, Montreal, PQ, Canada;[2]Hohai Univ, Coll Geog & Remote Sensing, Nanjing, Peoples R China;[3]Concordia Univ, Dept Bldg Civil & Environm Engn, Montreal, PQ, Canada;[4]Chinese Acad Forestry, Inst Wetland Res, Beijing, Peoples R China;[5]Hunan Normal Univ, Sch Geog Sci, Changsha, Peoples R China;[6]Peking Univ, Sino France Inst Earth Syst Sci, Coll Urban & Environm Sci, Lab Earth Surface Proc, Beijing, Peoples R China

年份：2023

卷号：37

期号：11

外文期刊名：GLOBAL BIOGEOCHEMICAL CYCLES

收录：;Scopus(收录号：2-s2.0-85175581781);WOS:【SCI-EXPANDED(收录号:WOS:001092419900001)】；

基金：This work was financially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), Fonds de recherche du Quebec (FRQNT), and China Scholarship Council (CSC). We also thank the colleagues who helped maintain the high-performance computer. We would like to thank Editage () for English language editing. We thank the comments and suggestions of anonymous reviewer(s).

语种：英文

外文关键词：nitrous oxide; rice-based ecosystems; N fertilizer; flooding water regimes; process-based biogeochemical model

摘要：The increasing atmospheric nitrous oxide (N2O) concentration stems from the development of agriculture. However, N2O emissions from global rice-based ecosystems have not been explicitly and systematically quantified. Therefore, this study aims to estimate the spatiotemporal magnitudes of the N2O emissions from global rice-based ecosystems and determine different contribution factors by improving a process-based biogeochemical model, TRIPLEX-GHG v2.0. Model validation suggested that the modeled N2O agreed well with field observations under varying management practices at daily, seasonal, and annual steps. Simulated N2O emissions from global rice-based ecosystems exhibited significant increasing trends from 0.026 +/- 0.0013 to 0.18 +/- 0.003 TgN yr(-1) from 1910 to 2020, with similar to 69.5% emissions attributed to the rice-growing seasons. Irrigated rice ecosystems accounted for a majority of global rice N2O emissions (similar to 76.9%) because of their higher N2O emission rates than rainfed systems. Regarding spatial analysis, Southern China, Northeast India, and Southeast Asia are hotspots for rice-based N2O emissions. Experimental scenarios revealed that N fertilizer is the largest global rice-N2O source, especially since the 1960s (0.047 +/- 0.010 TgN yr(-1), 35.24%), while the impact of expanded irrigation plays a minor role. Overall, this study provides a better understanding of the rice-based ecosystem in the global agricultural N2O budget; further, it quantitively demonstrated the central role of N fertilizer in rice-based N2O emissions by including rice crop calendars, covering non-rice growing seasons, and differentiating the effects of various water regimes and input N forms. Our findings emphasize the significance of co-management of N fertilizer and water regimes in reducing the net climate impact of global rice cultivation.