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Sci Total Environ

Title:		Atmospheric wet organic nitrogen deposition in China: Insights from the national observation network
Author(s):		Xi Y; Wang Q; Zhu J; Yang M; Hao T; Chen Y; Zhang Q; He N; Yu G;
Address:		"Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China. Electronic address: zhujianxing2008@yeah.net. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China. Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China; Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, Changchun, China"
Journal Title:		Sci Total Environ
Year:		2023
Volume:		20230718
Issue:
Page Number:		165629 -
DOI:		10.1016/j.scitotenv.2023.165629
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Organic nitrogen (N) is an important component of atmospheric reactive N deposition, and its bioavailability is almost as important as that of inorganic N. Currently, there are limited reports of national observations of organic N deposition; most stations are concentrated in rural and urban areas, with even fewer long-term observations of natural ecosystems in remote areas. Based on the China Wet Deposition Observation Network, this study regularly collected monthly wet deposition samples from 43 typical ecosystems from 2013 to 2021 and measured related N concentrations. The aim was to provide a more comprehensive assessment of the multi-component characteristics of atmospheric wet N deposition and reveal the influencing factors and potential sources of wet dissolved organic N (DON) deposition. The results showed that atmospheric wet deposition fluxes of NO(3)(-), NH(4)(+), DON and dissolved total N (DTN) were 4.68, 5.25, 4.32, and 13.05 kg N ha(-1) yr(-1), respectively, and that DON accounted for 30 % of DTN deposition (potentially up to 50 % in remote areas). Wet DON deposition was related to anthropogenic emissions (agriculture, biomass burning, and traffic), natural emissions (volatile organic compound emissions from vegetation), and precipitation processes. The wet DON deposition flux was higher in South, Central, and Southwest China, with more precipitation and intensive agricultural activities or more vegetation cover, and lower in Northwest China and Inner Mongolia, with less precipitation and human activities or vegetation cover. DON was the main contributor to DTN deposition in remote areas and was possibly related to natural emissions. In rural and urban areas, DON may have been more influenced by agricultural activities and anthropogenic emissions. This study quantified the long-term spatiotemporal patterns of wet N deposition and provides a reference for future N addition experiments and N cycle studies. Further consideration of DON deposition is required, especially in the context of anthropogenic control of NO(2) and NH(3)"
Keywords:		China Ecological effects Influencing factors Nitrogen deposition Organic nitrogen Spatial pattern;
Notes:		"PublisherXi, Yue Wang, Qiufeng Zhu, Jianxing Yang, Meng Hao, Tianxiang Chen, Yanran Zhang, Qiongyu He, Nianpeng Yu, Guirui eng Netherlands 2023/07/20 Sci Total Environ. 2023 Nov 10; 898:165629. doi: 10.1016/j.scitotenv.2023.165629. Epub 2023 Jul 18"