摘要
对南京秦淮河河谷平原中部土壤Hg污染分布特征及其影响进行了研究。结果表明,秦淮河河谷平原中部表层土壤Hg污染主要是由农田灌溉造成的,三级土壤沿秦淮河展布,二级土壤基本分布在平原区,一级土壤主要分布在岗地、山地。Hg污染主要富集在表层,高富集区主要分布在地势相对低洼处,有机质在本区对Hg的吸附有较大的亲和力,对Hg的积累有一定的控制作用;在三级土壤区域通过详查,已存在超三级土壤。本区土壤以中性、弱酸性为主,土壤抗酸化能力弱。随着酸雨的增多,土壤pH值的降低,土壤Hg向生物体迁移的数量将会加大,会给这一地区农产品安全带来风险。
The authors studied the distribution and affecting factors of Hg pollution in soil in the middle plain along Qinhuai River in Nanjing. The research showed that farmland irrigation was the major cause for topsoil Hg pollution along the middle and lower reaches of Qinhuai River. Along the Qinhuai River, there was a zonal extension of the third-level soil according to the national standard quality of soil environment; there were mostly second-level soil in the plain area; the hilly area and mountainous area mainly had first-level soils. Mercury was mainly concentrated in topsoil, and areas with high Hg concentration were mostly low-lying lands. With a quite strong absorption force in the studied area, organic matter was in some ways a dominant cause for Hg accumulation. The authors improved the density of sampling in areas with third-level soil. According to the analysis of these samples, soil whose mercury exceeded the third level existed in these areas. The soil in this area was mainly neutral or mildly acid, so it was hardly able to defend itself from acidification. With the increase of acid rain, the decrease of pH value of such soil consequently increased the transfer of mercury from the soil to living beings. This would bring risk to the security of farm products in this area.
出处
《地质学刊》
CAS
2010年第4期358-361,共4页
Journal of Geology
基金
中国地质调查局基础地质大调查项目(200312300008)
关键词
HG污染
分布特征
影响因素
秦淮河
江苏南京
Hg pollution
Distribution characteristics
Affecting factors
Qinhuai River
Nanjing
Jiangsu