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Your search keyword '"Songhan Wang"' showing total 2 results
Start Over Author "Songhan Wang" Journal proceedings of the national academy of sciences of the united states of america
2 results on '"Songhan Wang"'

1. Modeling global oceanic nitrogen deposition from food systems and its mitigation potential by reducing overuse of fertilizers.

Author

Lei Liu, Wen Xu, Zhang Wen, Pu Liu, Hang Xu, Sheng Liu, Xiankai Lu, Buqing Zhong, Yixin Guo, Xiao Lu, Yuanhong Zhao, Xiuying Zhang, Songhan Wang, Vitousek, Peter M., and Xuejun Liu

Subjects
NITROGEN fertilizers, FERTILIZERS, NITROGEN, WATER quality, SUSTAINABLE development
Abstract

Growing population and consumption pose unprecedented demands on food production. However, ammonia emissions mainly from food systems increase oceanic nitrogen deposition contributing to eutrophication. Here, we developed a long-term oceanic nitrogen deposition dataset (1970 to 2018) with updated ammonia emissions from food systems, evaluated the impact of ammonia emissions on oceanic nitrogen deposition patterns, and discussed the potential impact of nitrogen fertilizer overuse. Based on the chemical transport modeling approach, oceanic ammonia-related nitrogen deposition increased by 89% globally between 1970 and 2018, and now, it exceeds oxidized nitrogen deposition by over 20% in coastal regions including China Sea, India Coastal, and Northeastern Atlantic Shelves. Approximately 38% of agricultural nitrogen fertilizer was excessive, which corresponds to 15% of global oceanic ammonia-related nitrogen deposition. Policymakers and water quality managers need to pay increasingly more attention to ammonia associated with food production if the goal of reducing coastal nitrogen pollution is to be achieved for Sustainable Development Goals. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Exploring global changes in agricultural ammonia emissions and their contribution to nitrogen deposition since 1980

Author

Lei Liu, Wen Xu, Xiankai Lu, Buqing Zhong, Yixin Guo, Xiao Lu, Yuanhong Zhao, Wei He, Songhan Wang, Xiuying Zhang, Xuejun Liu, and Peter Vitousek

Subjects
Air Pollutants, Multidisciplinary, Ammonia, Nitrogen, Agriculture, Environmental Pollution, Ecosystem, Environmental Monitoring
Abstract

Significance Agricultural systems are already major forces of ammonia pollution and environmental degradation. How agricultural ammonia emissions affect the spatio-temporal patterns of nitrogen deposition and where to target future mitigation efforts, remains poorly understood. We develop a substantially complete and coherent agricultural ammonia emissions dataset in nearly recent four decades, and evaluate the relative role of reduced nitrogen in total nitrogen deposition in a spatially explicit way. Global reduced nitrogen deposition has grown rapidly, and will occupy a greater dominant position in total nitrogen deposition without future ammonia regulations. Recognition of agricultural ammonia emissions on nitrogen deposition is critical to formulate effective policies to address ammonia related environmental challenges and protect ecosystems from excessive nitrogen inputs.

Published
2022

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