应用生态学报2016，Vol.27Issue(10)：3205-3212,8.DOI:10.13287/j.1001-9332.201610.012
中国东部地区无机氮湿沉降:南-北不同类型监测点的比较
Inorganic nitrogen wet deposition in eastern China: Comparison of different land use-based monitoring sites in north and south regions
摘要
Abstract
China is one of the global hotspots of atmospheric nitrogen (N) deposition.This is especially true for eastern China,an economically developed and densely populated area,which emits large quantities of anthropogenic reactive N species to the air and experiences high levels of atmospheric N deposition.Few studies,however,have examined spatial variations of N deposition across different ecosystems in northern and southern regions of eastern China.Using the traditional rain gauge (SDM6A) method,we conducted a three-year (2011-2013) study to quantify wet N deposition fluxes at twelve sites (six northern and six southern monitoring sites,covering urban,rural and background land use types) in China.The annual volume-weighted mean (VWM) concentrations of NH4+-N,NO3--N and total inorganic N (TIN) at monitoring sites were in the ranges of 0.62-2.76,0.54-2.50 and 1.25-4.92 mg N · L-1,and averaged 1.4,1.5 and 2.9 mg N · L-1,respectively.Northern sites showed higher concentrations of N species in precipitation than southern sites.Annual deposition fluxes of NH4+-N,NO3--N and TIN were in the ranges of 7.0-18.3,6.9-18.9 and 14.9-32.6 kg N · hm-2 · a-1,averaging 11.5,12.2 and 23.7 kg N · hm-2 · a-1,respectively.There were significant differences in total N deposition fluxes among different land use types in the north,showing the decreasing order of urban sites (26.3±6.4 kg N · hm-2 · a-1) ＞ rural sites (21.8±3.5 kg N · hm-2 · a-1) ＞ background (15.5± 1.3 kg N · hm-2 · a-1).Total N deposition fluxes at urban,rural and background sites in the south were (26.8±2.7),(25.5±2.9) and (20.5±2.4) kg N · hm-2 · a-1,respectively,showing no significant spatial variation.While urban sites did not show obvious regional differences,total N wet deposition fluxes at rural and background sites in the south were significantly higher than those at corresponding sites in the north.Our results revealed that both south and north regions of eastern China (including background areas) are receiving high levels of wet N deposition and associated ecological and environmental risks should be considered.关键词
大气活性氮/湿沉降/中国东部地区/南北不同区域/生态风险Key words
atmospheric reactive N/wet deposition/eastern China/north-south regions/ecological risk引用本文复制引用
杨道伟,许稳,唐傲寒,鲁丽,刘学军..中国东部地区无机氮湿沉降:南-北不同类型监测点的比较[J].应用生态学报,2016,27(10):3205-3212,8.基金项目
本文由国家自然科学基金项目(40425007)资助 This work was supported by the National Natural Science Foundation of China (40425007). （40425007）
