中文摘要：

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）ng·m^-2·h^-1，中性紫色土为（34．9±25．7）ng·m^-2·h^-1，石灰性紫色土为（39．0±27．0）ng·m^-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．

英文摘要：

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 pH of 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.