江西九江地区不同林分类型土壤重金属污染评价

Evaluation on Soil Heavy Metal Pollution of Different Forest Stand Typein Jiujiang Region of Jiangxi Provionce

为明确江西省九江地区森林不同林分类型土壤重金属污染水平及其主要影响因素，分别选择马尾松林、针阔混交林、板栗林、白栎林、油茶林和毛竹林共6种典型林分，分0～10 cm、10～20 cm、20～30 cm、30～40 cm 和＞40 cm 共5个层面采集土样，测定其中的 Cu、Zn、Pb、有机碳和速效磷含量。结果表明：以我国土壤环境质量一级标准为评价标准，6种林分的表层土壤的重金属内梅罗指数均高于警戒值，有的已达到轻度污染水平；污染土壤的重金属在剖面上的垂直分布随着土壤深度的增加而递减，Cu 和 Zn 之间存在良好的同源性，且与土壤速效磷含量存在显著的相关关系。

The Cu,Zn,Pb,organic C and available P content of soil samples from different soil layers of six different typical forest soils was determined to study heavy metal pollution level and main influence factors in Jiujiang Region,Jiangxi.The heavy metal Nemero Index of the topsoil layer from six forest stands was higher than the alert value and some reached the mild contamination level according to the evaluation standard of the primary standard of National Soil Environment Quality.The soil heavy metal content decreased with increase of soil depth,which indicates that soil heavy metal content of topsoil layer is affected by human factors mainly.There is a good homology between Cu and Zn and a significant correlation between available P content and Cu,Zn content.