环境化学
氮氧化物
煤燃烧产物
δ15N
环境科学
铵
硝酸盐
氮同位素
煤
燃烧
沉积(地质)
氮气
降水
生物量(生态学)
化石燃料
活性氮
稳定同位素比值
化学
δ13C
地质学
海洋学
气象学
有机化学
古生物学
物理
量子力学
沉积物
作者
Xueyan Liu,Hong-Wei Xiao,Huayun Xiao,Xue-Yan Liu,Xinchao Sun,Xudong Zheng,Cong-Qiang Liu,Keisuke Koba
标识
DOI:10.1016/j.envpol.2017.06.010
摘要
To constrain sources of anthropogenic nitrogen (N) deposition is critical for effective reduction of reactive N emissions and better evaluation of N deposition effects. This study measured δ15N signatures of nitrate (NO3-), ammonium (NH4+) and total dissolved N (TDN) in precipitation at Guiyang, southwestern China and estimated contributions of dominant N sources using a Bayesian isotope mixing model. For NO3-, the contribution of non-fossil N oxides (NOx, mainly from biomass burning (24 ± 12%) and microbial N cycle (26 ± 5%)) equals that of fossil NOx, to which vehicle exhausts (31 ± 19%) contributed more than coal combustion (19 ± 9%). For NH4+, ammonia (NH3) from volatilization sources (mainly animal wastes (22 ± 12%) and fertilizers (22 ± 10%)) contributed less than NH3 from combustion sources (mainly biomass burning (17 ± 8%), vehicle exhausts (19 ± 11%) and coal combustions (19 ± 12%)). Dissolved organic N (DON) accounted for 41% in precipitation TDN deposition during the study period. Precipitation DON had higher δ15N values in cooler months (13.1‰) than in warmer months (-7.0‰), indicating the dominance of primary and secondary ON sources, respectively. These results newly underscored the importance of non-fossil NOx, fossil NH3 and organic N in precipitation N inputs of urban environments.
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