Sustainable management of riverine N_(2)O emission baselines  

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

机构地区：[1]Key Laboratory of Water and Sediment Sciences,Ministry of Education,Department of Environmental Engineering,Peking University,Beijing 100871,China [2]The National Key Laboratory of Water Disaster Prevention,Yangtze 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,Nanjing 210024,China [3]Department of Biogeochemistry,Max Planck Institute for Marine Microbiology,Bremen 28359,Germany [4]School of Water,Energy and Environment,Cranfield University,Cranfield MK430AL,UK

出　　处：《National Science Review》2025年第2期98-110,共13页国家科学评论(英文版)

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).

摘　　要：The riverine N_(2)O fluxes are assumed to linearly increase with nitrate loading.However,this linear relationship with a uniform EF5r is poorly constrained,which impedes the N_(2)O estimation and mitigation.Our meta-analysis discovered a universal N_(2)O emission baseline(EF5r=k/[NO_(3)^(-)],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 N_(2)O hotspots.Priority control of organic and NH_(4)^(+)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(△N-N_(2)O/N-NO_(3)^(-)).The discovery of EF lines emphasized the importance of targeting hotspots and managing baseline emissions sustainably to balance social and environmental benefits.

关 键 词：nitrous oxide emission factor HOTSPOTS SUSTAINABLE greenhouse gases 

分 类 号：G63[文化科学—教育学]