文献类型： 外文期刊
作者： Li, Kaihui 1 ; Liu, Xuejun 1 ; Geng, Fengzhan 1 ; Xu, Wen 4 ; Lv, Jinling 5 ; Dore, Anthony J. 6 ;
作者机构： 1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China
2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Bayinbuluk Grassland Ecosyst Res Stn, Bayinbuluk 841314, Peoples R China
3.CAS Res Ctr Ecol & Environm Cent Asia, Urumqi 830011, Peoples R China
4.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China
5.Henan Acad Agr Sci, Inst Plant Nutr Resources & Environm Sci, Zhengzhou 450000, Peoples R China
6.Ctr Ecol & Hydrol Edinburgh, Bush Estate, Penicuik EH26 0QB, Midlothian, Scotland
关键词： Dry deposition; Reduced nitrogen; Ecosystem; Air pollution; Central Asia
期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）
ISSN： 0944-1344
年卷期：
页码：
收录情况： SCI
摘要： Atmospheric reactive nitrogen (Nr) pollution leads to enhanced Nr deposition. There still big gaps in understanding atmospheric nitrogen deposition because of limited monitoring sites in arid land ecosystems of Central Asia. To determine Nr concentrations and deposition in the study area, we have set up 20 monitoring sites to collect gaseous, particulate, and precipitation samples and measure their Nr components since 2009. Nr concentrations in air showed large spatial variations. Based on the Nr concentrations, dry deposition was calculated using the monthly average Nr concentrations by the corresponding deposition velocities modeled, which was varied between 3.15 and 27.92 kg N ha(-1) yr(-1) across desert, grassland, desert-grassland, forest, farmland, and city/suburb ecosystems. Ammonia N deposition varied between 0.50 asnd 8.66 kg N ha(-1) yr(-1), and nitrate N deposition c varied between 0.67 and 4.22 kg N ha(-1) yr(-1), respectively, in precipitation. Annual N deposition is following the order of desert (4.0) < grassland (6.0) < desert-grassland (7.6) < forest (16.1) < farmland (18.4) < city/suburb (35.4) ecosystems. Dry deposition contributed 52.7, 53.8, 100, 68.2, 73.7, and 78.9% of total N deposition in grassland, desert-grassland, desert, forest, farmland and city/suburb ecosystems, respectively. Reduced nitrogen deposition accounted for 62% of total N deposition in the arid area. Dry NH3 deposition made an important contribution (on average 40%) to total N deposition. Therefore, understanding the characteristics of Nr pollution especially NH3 emission is indispensable to atmospheric pollution control in arid region.
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