污染控制技术及原理
林陶,张成,石孝均,王定勇.不同类型紫色土土/气界面汞释放通量及其影响因素[J].环境科学学报,2008,28(10):1955-1960
不同类型紫色土土/气界面汞释放通量及其影响因素
- Mercury fluxes released at soil/air interfaces in different Purpli-Udic Cambosols and the effects of environmental factors
- 关键词：紫色土(紫色常湿雏形土) 汞 土/气界面 释放通量
- 基金项目：国家自然科学基金(No.40573065,40673063)
- 作者
- 单位
- 林陶
- 1. 西南大学资源环境学院, 重庆 400716; 2. 贵州师范大学实验中心, 贵阳 550001
- 张成
- 西南大学资源环境学院, 重庆 400716
- 石孝均
- 西南大学资源环境学院, 重庆 400716
- 王定勇
- 1. 西南大学资源环境学院, 重庆 400716; 2. 重庆市农业资源与环境研究重点实验室, 重庆 400716
- 摘要：运用动力通量箱与RA-915+汞分析仪联用技术,对重庆市3种类型紫色土的土/气界面汞交换通量进行了实地监测.结果显示,不同类型紫色土的土/气界面汞交换通量有一定差异,随着土壤pH值的增加,汞交换通量值增大,酸性紫色土平均通量值为(30.8±23.7)n·gm-2·h-1,中性紫色土为(34.9±25.7)n·gm-2·h-1,石灰性紫色土为(39.0±27.0)n·gm-2·h-1.土/气界面汞交换量受光照、气温、土壤温度和空气相对湿度等因素的影响,汞交换通量与光照、气温和土壤温度呈显著正相关关系,与相对湿度呈显著负相关关系,与大气压不相关.
- Abstract：The mercury fluxes released at soil-air interfaces in three kinds of purple soils(Purpli-Udic Cambosols)in Chongqing.Field studies were conducted using a dynamic flux chamber coupled with a RA-915+ mercury analyzer.The mercury exchange fluxes increased with increasing the pHof soil.i.e.,the average values of the mercury fluxes on soil-air interfaces in Dystric Purpli-Udic Cambosols,Typic Purpli-Udic Cambosols and Calcaric Purpli-Udic Cambosols were(30.8±23.7)ng·m-2·h-1,(34.9±25.7)ng·m-2·h-1 and(39.0±27.0)ng·m-2·h-1,respectively.The effects of environmental factors including solar radiation,air temperature,relative humidity,and soil temperature on the mercury fluxes released at the soil/air interfaces were examined.The mercury exchange fluxes showed significantly positive correlations with solar radiation,air temperature,and soil temperature,significantly negative correlations with the relative humidity,and no correlation with atmospheric pressure.
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