Sustainable management of riverine N2O emission baselines

作     者：Shuo Wang Wei Zhi Shengjie Li Tao Lyu Guodong Ji Shuo Wang;Wei Zhi;Shengjie Li;Tao Lyu;Guodong Ji

作者机构：Key Laboratory of Water and Sediment Sciences Ministry of EducationDepartment of Environmental Engineering Peking University The National Key Laboratory of Water Disaster PreventionYangtze Institute for Conservation and Development Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water Resources College of Hydrology and Water Resources Hohai University Department of Biogeochemistry Max Planck Institute for Marine Microbiology School of Water Energy and Environment Cranfield University 

出 版 物：《National Science Review》 (国家科学评论(英文版))

年 卷 期：2025年第12卷第2期

页      面：104-116页

核心收录：

学科分类：08[工学] 081501[工学-水文学及水资源] 0815[工学-水利工程] 

基　　金：supported by the Key Projects of the Joint Fund of the National Natural Science Foundation of China (U22A20557) the Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River the National Natural Science Foundation of China (52379084) 

主　　题：nitrous oxide emission factor hotspots sustainable greenhouse gases 

摘      要：The riverine N2O fluxes are assumed to linearly increase with nitrate loading. However, this linear relationship with a uniform EF5ris poorly constrained, which impedes the N2O estimation and *** meta-analysis discovered a universal N2O emission baseline(EF5r= k/[NO3-], k = 0.02) for natural rivers. Anthropogenic impacts caused an overall increase in baselines and the emergence of hotspots, which constitute two typical patterns of anthropogenic sources. The k values of agricultural and urban rivers increased to 0.09 and 0.05, respectively, with 11% and 14% of points becoming N2O hotspots. Priority control of organic and NH4+pollution could eliminate hotspots and reduce emissions by 51.6% and 63.7%,respectively. Further restoration of baseline emissions on nitrate removal is a long-term challenge considering population growth and declining unit benefits（ΔN-N2O/N-NO3-）. The discovery of EF lines emphasized the importance of targeting hotspots and managing baseline emissions sustainably to balance social and environmental benefits.