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引用本文:宋玉芝,秦伯强,杨龙元,胡维平,罗潋葱.大气湿沉降向太湖水生生态系统输送氮的初步估算.湖泊科学,2005,17(3):226-230. DOI:10.18307/2005.0306
SONG Yuzhi,QIN Boqiang,YANG Longyuan,HU Weiping,LUO Liancong.Primary Estimation of Atmospheric Wet Deposition of Nitrogen to Aquatic Ecosystem of Lake Taihu. J. Lake Sci.2005,17(3):226-230. DOI:10.18307/2005.0306
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大气湿沉降向太湖水生生态系统输送氮的初步估算
宋玉芝1,2,3, 秦伯强1, 杨龙元1, 胡维平1, 罗潋葱1
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.中国科学院研究生院, 北京 100039;3.南京信息工程大学环境科学与工程系, 南京 210044
摘要:
测定和分析了2002年7月至2003年6月太湖周边地区太湖站、拖山岛、东山站、无锡、苏州、湖州、常州等7个站点大气降水化学组成,计算了水气界面TN、NH4+-N、NO3--N、T1N、TON的湿沉降率。结果表明,大气降水的TN浓度变化范围为2.06±0.30(常州)-3.71±0.43(拖山岛),太湖流域大气降水已呈富营养化水质的特征;大气降水TN、NH4+-N、NO3--N、TIN、TON的年均湿沉降率分别为2806.75kg/km2、1458.81kg/km2、631.67kg/km2、2090.48kg/km2和716.28kg/km2;每年由湿沉降直接进入太湖水体的TN约为6562.2t,NH4+-N为3410.7t,NO3--N为1476.8t,TIN为4887.5t,TON为1674.7t;TN占入湖河道年输入污染物总量的13.6%.大气湿沉降中,TIN对TN的贡献比较大,平均约占TN的78.78%.TIN的湿沉降率具有季节性分布,夏季高,春季次之,冬秋季低。这种现象无疑对太湖水体的蓝藻爆发和富营养化具有潜在的促进作用.
关键词:  太湖  大气污染  湿沉降  富营养化
DOI:10.18307/2005.0306
分类号:
基金项目:国家自然科学基金与香港资助局合作课题"大气氮磷输入对湖泊水质的影响研究"(N-HKUST612/01,40131160734)联合资助.
Primary Estimation of Atmospheric Wet Deposition of Nitrogen to Aquatic Ecosystem of Lake Taihu
SONG Yuzhi1,2,3, QIN Boqiang1, YANG Longyuan1, HU Weiping1, LUO Liancong1
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Graduate School of Chinese Academy of Sciences, Beijing 100039, P. R. China;3.Department of Environmental Science & Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
Abstract:
Fluxes of atmospheric wet deposition of nitrogen and precipitation chemical composition were measured from July 2002 lo June 2003 at the lakeside of Lake Taihu, on the Taihu Station, Tuoshan Island, Dongshan Station, and Wuxi, Suzhou, Huzhou, Changzhou sites. Results show that TN concentration of atmospheric wet deposition ranged from 2.06(Changzhou site) to 3.71 (Tuoshan Island site) and atmospheric wet deposition in the valley of Lake Taihu shows eutrophication. The wet deposition rale (Fw) of TN, NH4+-N, NO3--N, TIN, TON between atmosphere-water interfaces were measured, and the annual average Fw of TN, NH4+-N, NO3--N, TIN, T0N was 2806.75 kg/km2, 1458.81 kg/km2, 631.67 kg/km2, 2090.48 kg/km2 and 716.28 kg/km2, respectively. The direct input of TN f NH4+-N, NO3--N, TIN, TON through atmospheric wet deposition is 6562.2t, 3410.7t, 1476.8t, 4887.5t, 1674.71, respectively.and accounts for 13.59% of the total of the aquatic ecosystem of Lake Taihu.. TIN dominated in TN, accounting for 78.78% of TN. The variation of TIN wet deposition rate showed a seasoned seasonal feature:it was higher iu summer, nexl in spring, find lowest in winter and autumn. This phenomenon may potentifdly accelerate the cyanobacterial bloom and the eutrophication process of the water body of Lake Taihu.
Key words:  Lake Taihu  atmospheric pollution  wet deposition  eutrophication
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