基于受体模型和地统计学的海南岛农用地土壤重金属分布特征及源解析

Distribution characteristics and source analysis of heavy metals in agricultural soil on Hainan Island based on receptor model and geostatistics

基于海南岛农用地表层土壤中8种重金属含量测定结果,使用多元统计及污染指数法评价重金属污染风险,结合主成分分析/绝对主成分得分受体模型及地统计学方法对重金属污染来源及其分布特征作解析。结果表明:(1)海南岛农用地土壤重金属总体处于较低浓度水平,但存在局部区域富集情况。(2)污染来源主要有自然源、工业交通源及农业源。自然源对Ni、Cr、Cu的贡献率分别为79.1%、60.5%、45.5%,高值集中在海南岛东北部玄武岩覆盖区;工业交通源对Hg、Pb、Zn的贡献率分别为73.6%、73.5%和59.4%,高值散落于环岛高速及港口区域、主要城市、交通枢纽所在及矿产开采区;农业源对Cd、As的贡献率分别为62.9%、54.9%,高值分布于海南岛沿海平原农业密集区。

Based on 8 heavy metals contents of surface soil from agricultural land on Hainan Island,soil heavy metals contamination were assessed by multivariate statistics and pollution index,while pollution sources and apportion of heavy metals were analized through PCA/APCS receptor model and geostatistics.The results showed that:(1)heavy metals of Hainan Island agricultural land were at low concentrations,but local enrichment existed.(2)Pollution sources mainly included natural sources,industrial traffic sources and agricultural sources.Contribution rates of natural sources for Ni,Cr and Cu were 79.1%,60.5%and 45.5%,and the high-value located at basalt overburden area of Northeastern Hainan Island.Contribution rates of industrial and traffic sources for Hg,Pb and Zn were 73.6%,73.5%and 59.4%,and the high-value distributed in roundabout highway and port area,main cities,transportation hubs and mining areas.Contribution rates of agricultural sources for Cd and As were 62.9%and 54.9%,both high-value distributed in coastal plains of Hainan Island,which were agricultural intensive areas.