• 关键词：含氮化合物  气态  颗粒态  空间分布  太湖地区

• 基金项目：国家自然科学基金(No. 41301578);江苏省自然科学基金(No. BK20131047)

• 高波
• 1. 南京农业大学, 资源与环境科学学院, 南京 210095;2. 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008

• 罗永霞
• 1. 南京农业大学, 资源与环境科学学院, 南京 210095;2. 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008

• 颜晓元
• 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008

• 姜小三
• 南京农业大学, 资源与环境科学学院, 南京 210095

• 遆超普
• 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008

• 摘要：为研究太湖地区大气中主要含氮化合物的污染水平及其空间分布特征,选取代表城市、城郊、农村3种不同土地利用类型的苏州、常熟、宜兴作为研究区域,采用中流量大气采样器采集3个研究区春季大气和颗粒物样品,分析各形态含氮化合物的浓度.结果表明:春季太湖地区大气中气态含氮化合物NH₃、HNO₃和NO₂的平均浓度分别为25.77、4.33和6.23 μg·m^-3(以N计,下同).其中,农村地区大气NH₃浓度显著高于城市和城郊地区,具体表现为农村>城郊>城市,HNO₃、NO₂浓度三地差异不显著;颗粒态TN、NH₄⁺和NO₃^-平均浓度分别为13.21、7.55和4.75 μg·m^-3.其中,TN、NH₄⁺浓度城市和城郊地区存在显著差异,均表现为城郊>农村>城市,NO₃^-浓度城郊地区显著高于城市和农村地区,但城市和农村差异性不显著.实验结果同时显示,春季太湖地区大气中TSP的平均浓度为0.15 mg·m^-3,城郊地区因为受到农业与工业的共同影响,应成为防控含氮化合物污染的重点区域.

• Abstract：To evaluate the atmosphere pollution levels and spatial distribution characteristics of major nitrogen compounds in the Taihu Lake region, Suzhou, Changshu and Yixing were selected to represent three types of land uses, cities, suburbs, and rural areas, respectively. Ambient air and TSP (Total Suspended Particulate) samples were collected by medium air flow samplers, and the concentrations of different forms of nitrogen compounds were analyzed. The results indicated that the average concentrations of the gaseous NH₃, HNO₃ and NO₂ in the Taihu Lake region were 25.77, 4.33 and 6.23 μg(N)·m^-3, respectively. Concentrations of NH₃ in the rural area were significantly higher than those of suburban and urban areas. However, no significant difference was observed on concentrations of HNO₃ and NO₂ among these areas. The average concentrations of particulate TN, NH₄⁺ and NO₃^- in this region were 13.21, 7.55 and 4.75 μg(N)·m^-3, respectively. Concentrations of TN and NH₄⁺ were significantly different between urban and suburban areas with the trend suburban>rural>urban. Concentrations of NO₃^- in the suburban area were significantly higher than those of urban and rural areas, while there was no significant difference between urban and rural areas. Meanwhile, the experimental results also showed that the average atmospheric concentration of TSP in the Taihu Lake region in spring was 0.15 mg·m^-3. Owing to the combined effects of agriculture and industry, suburban areas should become the focus in this region for controlling the nitrogen pollution.

• Key words：nitrogen compounds  gaseous nitrogen  particulate nitrogen  spatial distribution  the Taihu Lake region

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