Seasonal fluxes and sources apportionment of dissolved inorganic nitrogen wet deposition at different land-use sites in the Three Gorges reservoir area

被引:17
作者
Cui, Jian [1 ,2 ,3 ]
Zhang, Yuanzhu [4 ]
Yang, Fumo [3 ]
Chang, Yajun [1 ,2 ]
Du, Ke [5 ]
Chan, Andy [6 ]
Yao, Dongrui [1 ,2 ]
机构
[1] Inst Bot, Nanjing 210014, Peoples R China
[2] Chinese Acad Sci, Nanjing Bot Garden, Mem Sun Yat Sen, Nanjing 210014, Peoples R China
[3] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Ctr Atmospher Environm Res, Chongqing 400714, Peoples R China
[4] Southwest Univ, Coll Resources & Environm, Chongqing 400715, Peoples R China
[5] Univ Calgary, Dept Mech & Mfg Engn, Calgary, AB T2N 1N4, Canada
[6] Univ Nottingham, Fac Engn, Malaysia Campus,Jalan Broga, Semenyih 43500, Selangor Darul, Malaysia
基金
中国国家自然科学基金;
关键词
Inorganic nitrogen; Nitrogen isotope; Wet deposition; Source apportionment; Three Gorges reservoir (TGR); AIR-QUALITY; PRECIPITATION NITROGEN; ATMOSPHERIC AMMONIA; VEHICLE EMISSIONS; TEMPORAL PATTERNS; NORTH CHINA; EUTROPHICATION; SULFUR; WATER; PHOSPHORUS;
D O I
10.1016/j.ecoenv.2020.110344
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
To identify seasonal fluxes and sources of dissolved inorganic nitrogen (DIN) wet deposition, concentrations and delta N-15 signatures of nitrate (NO3-) and ammonium (NH4+) in wet precipitation were measured at four typical land-use types in the Three Gorges reservoir (TGR) area of southwest China for a one-year period. Higher DIN fluxes were recorded in spring and summer and their total fluxes (averaged 7.58 kg N ha(-1)) were similar to the critical loads in aquatic ecosystems. Significant differences of precipitation delta N-15 were observed for NH4+-N between town and wetland sites in spring and between urban and rural sites in summer. For NO3--N, significant differences of precipitation delta N-15 were observed between town and rural sites in spring and between urban and town sites in autumn, respectively. Quantitative results of NO3--N sources showed that both biomass burning and coal combustion had higher fluxes at the urban site especially in winter (0.18 +/- 0.09 and 0.19 +/- 0.08 kg N ha(-1)), which were about three times higher than those at the town site. A similar finding was observed for soil emission and vehicle exhausts in winter. On the whole, DIN wet deposition averaged at 12.13 kg N ha(-1) yr(-1) with the urban site as the hotspot (17.50 kg N ha(-1) yr(-1)) and regional NO3--N fluxes had a seasonal pattern with minimum values in winter. The contribution to NO3--N wet deposition from biomass burning was 26.1 +/- 14.1%, which is the second dominant factor lower than coal combustion (26.5 +/- 12.6%) in the TGR area during spring and summer. Hence N emission reduction from biomass burning, coal combustion and vehicle exhausts should be strengthened especially in spring and summer to effectively manage DIN pollution for the sustainable development in TGR area.
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页数:8
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