Unlocking nitrogen management potential via large-scale farming for air quality and substantial co-benefits  

作　　者：Baojie Li Hong Liao Ke Li Ye Wang Lin Zhang Yixin Guo Lei Liu Jingyi Li Jianbing Jin Yang Yang Cheng Gong Teng Wang Weishou Shen Pinya Wang Ruijun Dang Kaihua Liao Qing Zhu Daniel J.Jacob 

机构地区：[1]Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China [2]Laboratory for Climate and Ocean-Atmosphere Studies,Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871,China [3]Earth,Ocean and Atmospheric Sciences Thrust,Function Hub,Hong Kong University of Science and Technology(Guangzhou),Guangzhou 511442,China [4]College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China [5]Department of Biogeochemical Signals,Max Planck Institute for Biogeochemistry,Jena 07745,Germany [6]College of Oceanography,Hohai University,Nanjing 210024,China [7]John A.Paulson School of Engineering and Applied Sciences,Harvard University,Cambridge,MA 02138,USA [8]Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China

出　　处：《National Science Review》2024年第10期206-216,共11页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(42021004,42377393 and 42361144876);the Jiangsu Science Fund for Carbon Neutrality(BK20220031);the NUIST-Harvard Joint Laboratory for Air Quality and Climate(JLAQC).

摘　　要：China’s sustained air quality improvement is hindered by unregulated ammonia(NH3)emissions from inefficient nitrogen management in small holder farming.Although the Chinese government is promoting a policy shift to large-scale farming,the benefits of this,when integrated with nitrogen management,remain unclear.Here we fill this gap using an integrated assessment,by combining geostatistical analysis,high-resolution emission inventories,farm surveys and air quality modeling.Smal l holder-dominated farming allows only 13%-31%NH_(3)reduction,leading to limited PM_(2.5)decreases nationally due to non-linear PM_(2.5)chemistry.Conversely,large-scale farming would double nitrogen management adoption rates,increasing NH3 reduction potential to 48%-58%and decreasing PM_(2.5)by 9.4-14.0μg·m^(−3)in polluted regions.The estimated PM_(2.5)reduction is conservative due to localized NH_(3)-rich conditions under large-scale livestock farming.This strategy could prevent over 300000 premature deaths and achieve a net benefit of US$68.4-86.8 billion annually,unlocking immense benefits for air quality and agricultural sustainability.

关 键 词：nitrogen management large-scale farming air quality ammonia emission 

分 类 号：X51[环境科学与工程—环境工程]