| 三峡库区典型农田系统大气汞浓度及不同自然界面释汞通量 |
| 摘要点击 1819 全文点击 789 投稿时间：2016-02-25 修订日期：2016-04-11 |
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| 中文关键词 大气汞 汞释放 农田系统 三峡库区 |
| 英文关键词 total gaseous mercury mercury emission agricultural environment Three Gorges Reservoir |
| 作者 | 单位 | E-mail | | 王永敏 | 西南大学资源环境学院, 重庆 400715 | wangym.540@163.com | | 赵铮 | 贵州省环境监测中心站, 贵阳 550081 | | | 孙涛 | 西南大学资源环境学院, 重庆 400715 | | | 王娅 | 西南大学资源环境学院, 重庆 400715 | | | 薛金平 | 西南大学资源环境学院, 重庆 400715 | | | 张成 | 西南大学资源环境学院, 重庆 400715
重庆市三峡库区农业面源污染控制工程技术研究中心, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | | | 王定勇 | 西南大学资源环境学院, 重庆 400715
重庆市三峡库区农业面源污染控制工程技术研究中心, 重庆 400716
重庆市农业资源与环境研究重点实验室, 重庆 400716 | dywang@swu.edu.cn |
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| 中文摘要 |
| 以三峡库区周边典型农田系统为研究对象，对不同土壤利用类型下的界面汞释放通量及影响因素进行系统研究，并同时对区域内大气汞（TGM）浓度进行监测.结果表明，研究区TGM浓度范围为2.67～75.5 ng·m-3，春冬两季显著高于夏秋季，其均值为（6.26±8.11）ng·m-3，明显高于全球TGM浓度背景值.不同地表类型下土壤释汞通量表现为旱地 >稻田 >林地；季节变化表现为夏季最高，冬季最低；日变化中最大的释放量出现在正午.不同地表中释汞通量的主要影响因素均为气温、湿度、光照、紫外线强度、土温等，其中气温和紫外强度是影响不同地表土/气界面汞交换的主要因子；在环境因子与农业活动的外界影响下，土壤本底汞含量对不同界面的土壤释汞通量的作用不明显. |
| 英文摘要 |
| In situ measurement of total gaseous mercury (TGM) and mercury exchange fluxes between soil with different utilization patterns and atmosphere was conducted at one typical agricultural region in Three Gorges Reservoir. The TGM concentration ranged from 2.67 to 75.5 ng·m-3 with the average of (6.26±8.11) ng·m-3, higher than the global background value. An obvious seasonal variation of TGM was observed, and the TGM values in spring and winter were significantly higher than those in summer and autumn. It was found that the mercury fluxes varied from different landscapes with the emission fluxes at three land use types following the trend:rainfed cropland >paddy field >forest land. Seasonal variations of mercury emission were obvious with highest fluxes in summer and lowest in winter, while the highest daily mercury emission fluxes appeared at midday. Mercury emission fluxes in our study region were mainly controlled by air and soil temperature, humidity, light and ultraviolet, and the air temperature and ultraviolet were regarded as the main factors. The influence of Hg level in soil on Hg emission was not obvious in the presence of environmental factors and agricultural activity. |
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