南宁市郊伊岭岩农业生态示范园规划区土壤重金属污染程度评价

Pollution degree assessment of heavy metals in the soil of Yilingyan Agro-ecological Demonstration Park planning area in Nanning suburb

通过对南宁市郊伊岭岩农业生态示范园规划区土壤中重金属Cu、Zn、Cd、Pb、As、Hg含量进行测定分析,并采用模糊综合评判法对土壤重金属污染情况进行评价。结果表明:伊岭岩农业生态示范园规划区土壤不同程度受到Cu、Zn、Cd、Pb、As、Hg的污染,污染程度依次是:Cd>Cu=As>Pb=Zn=Hg;10个样本污染程度依次为:n10>n9>n1=n2=n7=n8>n5>n6=n3=n4,其中样本3、4、5、6所代表的4个区域属尚清洁,样本1、2、7、8、9、10所代表的6个区域为轻污染。该园区土壤重金属含量较高,可能与其常年大量施用磷肥有关。因此,为了减少重金属积累量,提高该园生态环境和生产能力,需减少磷肥的施用,注意各种肥料的合理搭配。

In this assessment, the heavy metal elements Cu,Zn ,Cd,Pb,As and Hg contents in soil of planning area of Yilingyan Agro-ecological Demonstration Park in Nanning were analyzed and the degree of pollution by heavy metals in soil were evaluated with fuzzy comprehensive evaluation method. The results showed that soils in the planning area have been polluted at various levels by heavy metal elements such as Cu,Zn,Cd ,Pb ,As and Hg, and the pollution degree of different heavy metals was as follows： Cd〉Cu = As〉Pb= Zn = Hg. Moreover, the pollution degree of 10 soil samples was as follow： n10〉n9〉n1=n2=n7=n5〉n5〉n6=n3=n4, among them, the samples n3, n4, n5 and n6 belonged to cleanness, and the samples n1, n2, n7, n8, n9 and nl0belonged to light pollution. Therefore, the heavy metal content of soil in the planning area is rather high, and it may be most likely related to the annual over use of phosphate fertilizer. In order to reduce the accumulation of heavy metals in the planning area, improve the ecological environment and soil productivity, application of phosphate fertilizer should be reduced and all kinds of fertilizers should be used in proper proportion.