关于两个功能区背景下沉降物中汞的研究

１９９７年在西南农业大学生活区及重庆北碚郊区菜地设观测点研究了大气干、湿沉降物汞的变化规律，结果表明：雨水汞浓度随降雨持续时间延长和降雨强度增大而呈下降趋势，与当日降雨量没有明显的相关性。大气沉降向生活区输入汞的总量显著高于菜地系统，其中输入到生活区中的汞，干沉降约为７０％、湿沉降约为３０％；而输入到菜地系统中的汞，干、湿沉降的输入量大体相当。

Study of Mercury in Precipitation in Two Different Function Areas

In this research the variable laws of the dry precipitation Hg and the wet precipitation Hg were studied in 1997 at the observation spots of vegetable field in the living area of Southwest Agricultural University and the suburb of Beibei,Chongqing.The results indicated that the precipitation Hg concentration decreased with the raining continuance and the increment of raining density,but was not obviously relative to the correspondent rainfall.The amount of Hg transferred into the living area was much more than that into the vegetable system.In the living area the distribution of dry precipitation to vegetable Hg was about 70%,and the distribution of wet precipitation was about 30%.But in the vegetable system the distribution of dry precipitation to vegetable Hg was nearly equal to that of wet precipitation.