| 亚热带稻区大气NO2、HNO3及硝态氮污染特征及干湿沉降 |
| 摘要点击 1537 全文点击 621 投稿时间：2018-10-30 修订日期：2018-12-30 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 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 dioxide nitric acid aerosol rainwater nitrate nitrogen wet and dry deposition paddy 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--Np、雨水中NO3--Nr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--Np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--Np污染的重要限制因子；NO3--Nr浓度与降雨量呈负相关，与HNO3-N浓度和NO3--Np浓度呈正相关.本研究区域大气中NO2-N、HNO3-N、NO3--Np及雨水NO3--Nr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--Np), and rainwater nitrate-nitrogen (NO3--Nr) in a double rice region in subtropical China are still unclear,. In this study, the atmosphere concentrations of NO2-N, HNO3-N, NO3--Np in PM10, and NO3--Nr 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--Np, and NO3--Nr concentrations and quantifying the wet and dry deposition rates. The results showed that the annual mean concentrations of NO2-N, HNO3-N, NO3--Np, and NO3--Nr 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--Np 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--Np pollution in this study area. The NO3--Nr concentrations were negatively correlated with rainfall, as well as the concentrations of HNO3-N and NO3--Np. The annual total dry and wet depositions of the atmospheric NO2-N, HNO3-N, NO3--Np, and NO3--Nr 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. |
|
|
|
