Wet deposition and sources of inorganic nitrogen in the Three Gorges Reservoir Region, China.
Wet deposition and sources of inorganic nitrogen in the Three Gorges Reservoir Region, China.
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DOI：
10.1016/j.envpol.2017.10.085
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发表时间：
2018-02
影响因子：
8.9
通讯作者：
Huanbo Wang;G. Shi;Mi Tian;Yang Chen;Baoqing Qiao;Liuyi Zhang;Fumo Yang;Leiming Zhang;Qiong Luo
中科院分区：
文献类型：
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作者：
Huanbo Wang;G. Shi;Mi Tian;Yang Chen;Baoqing Qiao;Liuyi Zhang;Fumo Yang;Leiming Zhang;Qiong Luo
2014年3月至2016年2月，在中国三峡库区（TGR）的五个农村和一个城市站点收集了降水样本。分析了该地区无机活性氮（Nr）含量，以探讨其湿沉降通量、收支和来源。在为期两年的研究活动中，六个地点的年氮湿沉降量从7.1到23.4千克氮ha− 1 yr − 1不等。2014年和2015年，六个站点的平均Nr湿沉降通量分别为17.1和11.7 kg N ha− 1 yr − 1，其中71%来自NH 4+，29%来自NO3−。干沉降通量估计使用推理的方法，结合测量的环境浓度和模拟的干沉降速度。2014年和2015年，农村地区的总（干+湿）氮沉降通量估计分别为21.4 kg N ha− 1 yr − 1和16.0 kg N ha− 1 yr − 1，城市地区分别为31.4 kg N ha − 1 yr − 1和25.3 kg N ha− 1 yr − 1。年平均体积加权平均（VWM）浓度在降水中的所有六个站点的NO3-差异不大，但高达2.0的因子为NH 4+在城市站点的最高值。工业排放，农业排放，土壤粉尘，生物质燃烧被确定为降水中的主要无机离子的潜在来源，使用因子分析和相关性分析。条件概率函数（CPF）分析表明，城市站点主要是由发电厂，水泥厂，盐化工设施位于采样点东南约13公里的工业排放的影响。
Precipitation samples were collected at five rural and one urban sites in the Three Gorges Reservoir Region (TGR), China from March 2014 to February 2016. The inorganic reactive nitrogen (Nr) contents were analysed to investigate their wet deposition flux, budget, and sources in the area. Annual Nr wet deposition varied from 7.1 to 23.4 kg N ha−1yr−1over the six sites during the two-year study campaign. The six-site average Nr wet deposition flux was 17.1 and 11.7 kg N ha−1yr−1in 2014 and 2015, respectively, with 71% from NH4+and 29% from NO3−. Dry deposition flux was estimated using the inferential method, which combined the measured ambient concentrations and modelled dry deposition velocities. The total (dry + wet) Nr deposition fluxes were estimated to be 21.4 kg N ha−1yr−1in 2014 and 16.0 kg N ha−1yr−1in 2015 at rural sites, and 31.4 and 25.3 kg N ha−1yr−1at the urban site. Annual average volume weighted mean (VWM) concentrations in precipitation at all the six sites differed little for NO3−but up to a factor of 2.0 for NH4+with the highest value at the urban site. Industrial emissions, agricultural emissions, soil dust, and biomass burning were identified as potential sources of the major inorganic ions in precipitation using factor analysis and correlation analysis. Conditional probability function (CPF) analysis indicated that the urban site was predominantly affected by industrial emissions from a power plant, cement manufactory, and salt chemical facility located ∼13 km southeast of the sampling site.