酸沉降地区大气汞对土壤-植物系统汞累积影响的调查研究

AN INVESTIGATION ON THE EFFECT OF ATMOSPHERIC MERCURY ON ITS ACCUMULATION IN THE SOIL PLANT SYSTEM IN ACID PRECIPITATION AREA

按酸沉降危害程度的差异及不同功能区，进行了大气、植物、土壤汞的同步调查采样分析。结果表明，大气汞对土壤－植物系统汞累积的影响非常明显，土壤、植物含汞量均随大气汞浓度的升高而升高，土壤－植物系统汞累积与大气汞浓度有显著的相关（相关系数分别为ｒ植＝０．８８２＊＊，ｎ＝５３；ｒ土＝０．７４１＊＊，ｎ＝５２）。调查还发现，当大气汞浓度大于３０ｎｇ／ｍ３时，土壤－植物系统汞累积较为明显。

A series samples of atmosphere,plant and soil were collected and analyzed of Hg content at different function regions in acid precipitation area. The results showed that the pollution of Hg from atmosphere to soil plant system was very serious.There was a significant possitive correlation between the concentration of atmospheric Hg and its accumulation in soil plant system ( r =0.741 ** , n =52 for the soil and r =0.882 ** , n =53 for the plant).In areas where the concentration of atmospheric Hg was more than 30 ng/m 3, the accumulation of Hg in soil plant system was more obvious. This suggested that 30 ng(Hg)/m 3 was the critical concentration of the secondary pollution of Hg from atmosphere to soil plant system in the investigation area.