中文关键词二氧化氮硝酸气溶胶雨水硝态氮干湿沉降稻田 英文关键词nitrogen dioxidenitric acidaerosolrainwaternitrate nitrogenwet and dry depositionpaddy field

作者	单位	E-mail
欧阳秀琴	苏州大学金螳螂建筑学院, 苏州 215123 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125 中国科学院长沙农业环境观测研究站, 长沙 410125	18862344784@163.com
王波	苏州大学金螳螂建筑学院, 苏州 215123	wangb@suda.edu.cn
沈健林	中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125 中国科学院长沙农业环境观测研究站, 长沙 410125	jlshen@isa.ac.cn
朱潇	中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125 中国科学院长沙农业环境观测研究站, 长沙 410125
王杰飞	中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125 中国科学院长沙农业环境观测研究站, 长沙 410125
李勇	中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125 中国科学院长沙农业环境观测研究站, 长沙 410125
吴金水	中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室, 长沙 410125 中国科学院长沙农业环境观测研究站, 长沙 410125

中文摘要 二氧化氮（NO₂）和硝酸（HNO₃）是大气中的酸性含氮污染气体，是形成气溶胶和雨水硝态氮的重要前体物质，在高强度的大气氮氧化物排放下，我国亚热带稻区农业生态系统大气NO₂、HNO₃气体及气溶胶、雨水硝态氮污染特征及其干湿沉降量尚不清楚.本研究选取我国亚热带丘陵区一个典型双季稻区，对大气中NO₂-N、HNO₃-N、气溶胶和雨水硝态氮浓度及相关气象因子进行了同步监测，旨在明确大气NO₂-N、HNO₃-N及气溶胶、雨水硝态氮浓度特征及其影响因素，并定量其干湿沉降量.结果表明，大气中NO₂-N、HNO₃-N、大气颗粒物PM₁₀中NO₃^--N_p、雨水中NO₃^--N_r年均浓度分别为4.2 μg·m^-3、0.7 μg·m^-3、4.0 μg·m^-3和1.0 mg·L^-1，年氮沉降量分别为1.5、3.2、2.3和6.1 kg·hm^-2.NO₂-N浓度与气温呈负相关；HNO₃-N浓度与风速呈负相关；NO₃^--N_p浓度与气温呈负相关，与NO₂-N浓度呈正相关，与HNO₃-N浓度未显著相关，表明NO₂-N浓度在本研究区域是形成NO₃^--N_p污染的重要限制因子；NO₃^--N_r浓度与降雨量呈负相关，与HNO₃-N浓度和NO₃^--N_p浓度呈正相关.本研究区域大气中NO₂-N、HNO₃-N、NO₃^--N_p及雨水NO₃^--N_r年总干湿沉降量为13.0 kg·hm^-2，是稻田重要的氮素来源，对稻田及周边生态系统的影响不容忽视. 英文摘要 Nitrogen dioxide (NO₂) and nitric acid (HNO₃) are nitrogen-containing acidic gases in the atmosphere, and they are important precursors of nitrate in aerosol and rainwater. The emission intensity of atmospheric nitrogen oxides is high in the subtropical region of China, but the concentrations and deposition rates of atmospheric nitrogen dioxide, nitric acid, particulate nitrate-nitrogen (NO₃^--N_p), and rainwater nitrate-nitrogen (NO₃^--N_r) in a double rice region in subtropical China are still unclear,. In this study, the atmosphere concentrations of NO₂-N, HNO₃-N, NO₃^--N_p in PM₁₀, and NO₃^--N_r and related meteorological parameters were simultaneously monitored in a typical double rice region within a subtropical hilly region of China, with the aim of determining the characteristics and influencing factors of NO₂-N, HNO₃-N, NO₃^--N_p, and NO₃^--N_r concentrations and quantifying the wet and dry deposition rates. The results showed that the annual mean concentrations of NO₂-N, HNO₃-N, NO₃^--N_p, and NO₃^--N_r were 4.2 μg·m^-3, 0.7 μg·m^-3, 4.0 μg·m^-3, and 1.0 mg·L^-1, respectively, and the deposition rates were 1.5, 3.2, 2.3, and 6.1 kg·hm^-2, respectively. The NO₂-N concentrations were negatively correlated with air temperatures, and the HNO₃-N concentrations were negatively correlated with wind speeds. TheNO₃^--N_p concentrations were negatively correlated with air temperatures, positively correlated with NO₂-N concentrations, but not significantly correlated with HNO₃-N concentrations, thus indicating that NO₂-N concentrations were an important limiting factor forNO₃^--N_p pollution in this study area. The NO₃^--N_r concentrations were negatively correlated with rainfall, as well as the concentrations of HNO₃-N and NO₃^--N_p. The annual total dry and wet depositions of the atmospheric NO₂-N, HNO₃-N, NO₃^--N_p, and NO₃^--N_r were 13.0 kg·hm^-2, which indicates that these compounds are important sources of nitrogen in paddy fields and may have significant impacts on paddy fields and surrounding ecosystems.

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