基于关联规则的土壤重金属积累与土地利用方式的关联分析

Association Analysis on Soil Heavy Metal Accumulation and Land Use Types Based on Association Rules

[目的]探明土壤重金属污染的外源因素。[方法]以4种土地利用方式(粮田、蔬菜地、果园及林地)下的356份土样为材料,采用关联规则法定量分析土壤重金属含量与土地利用方式的关联性。[结果]土样中As、Cd、Cr、Cu和Hg的平均含量分别为8.65、0.20、53.12、20.89、0.14mg/kg,其中As、Cr、Cu含量受土地利用方式的影响较小,Cd和Hg含量受土地利用方式的影响较大;不同土地利用方式引发重金属As、Cr、Cu积累的概率小于22%,而引发Cd和Hg积累的概率介于32.0%～44.9%。[结论]监测区域土地利用方式有造成土壤重金属Cd和Hg积累的趋势。

[ Objective ] The study was to prove the external factors of soil heavy metal pollution. [ Method ] With 356 soil samples from 4 kinds of land use types （ crop fields, vegetable field, orchard and forest land） as the materials, the association of soil heavy metal content and land use types was quantitatively analyzed. [ Result] The average contents of As, Cd, Cr, Cu and Hg were 8.65,0.20, 53.12, 20.89, 0. 14 mg/kg resp. The effects of land use types on contents of As, Cr, Cu were little, but that of land use types on contents of Cd and Hg was bigger. The probabilities of As, Cr, Cu accumulation caused by land use types were less than 22% , but those of Cd and Hg accumulation caused by land use types were 32.0% -44.9%. [ Conclusion ] Cd and Hg in the monitoring area had accumulation trend which was caused by land use types.