贵州农业非点源污染土壤重金属含量特征及区域差异性研究

贵州农用地土壤在长期的耕作过程中,承载大量的重金属污染物,影响土壤质量。采集了贵州东部、南部、中部、北部主要农业非点源重金属污染区土壤样品进行检测。结果表明,贵州农业非点源重金属污染物主要是Hg、Pb,贵州省农业非点源污染土壤中重金属累积污染程度Hg＞Pb＞Cd＞As＞Cr。各地区污染物种类和程度不同,重金属As污染为中部地区较高,农业土壤Hg、Pb污染主要集中在中部和东部地区,Cd污染主要发生在南部区域。

The Content Characteristics of Soil Heavy Mentals and Regional Differences Study on Agricultural Non-point Source Pollution in Guizhou Province

Agricultural soil in Guizhou province carries a large number of heavy metal contaminants in the long-term cultivation process which affects the soil quality. By collecting and testing the soil samples from main agricultural non-point source of heavy metals polluted regions in eastern,southern,central and northern part of Guizhou,the results show that: the main heavy metals pollutants are Hg and Pb,and the pollution degree of heavy metal pollutants is Hg>Pb>Cd>As>Cr. The types and the extent of pollutants in various regions are different:the heavy metal pollution of As is higher in central region than other regions in Guizhou,the Hg and Pb pollutions mainly concentrate in central and eastern regions,and Cd pollution mainly occurs in southern region.