基于地积累指数法和潜在生态风险指数法评价广西某蔗田土壤重金属污染

Assessment on Heavy Metals Contaminations of Sugarcane Soil in Guangxi Province by the Geo-accumulation Index and Potential Ecological Risk Index

采用地积累指数法和潜在生态风险指数法对广西某蔗田土壤中重金属污染进行评价。结果表明:4种重金属元素的地积累指数污染程度由强到弱依次为:Cd>Zn>Pb>Cu,潜在生态危害指数污染程度由强到弱依次为:Cd>Pb>Cu>Zn,其中Zn的影响程度发生了变化。2种评价方法的结果存在差异,蔗田土壤的地积累指数污染程度处于无污染情况,而潜在生态危害指数污染程度处于低度危害程度。潜在生态危害指数考虑外源重金属的富集程度和不同重金属的生物毒性的影响,使其评价结果更准确。

Assessment of heavy metals contaminations of sugarcane soil in Guangxi Province was conducted by the geo-accumulation index and potential ecological risk index respectively. The results showed the relative degree of geo-accumulation index was in order of Cd〉Zn〉 Pb〉Cu, while the potential ecological risk index was in order of Cd 〉Pb〉Cu〉Zn, the influence of Zn was changed. Both of the evaluation methods could get different conclusions. The sugarcane soil was characterized by no contamination of geo-accumulation index and posed low hazard by potential ecological risk index. The potential ecological risk index consider not only the exogenous enrichment of heavy metals, but also the effects of different biological toxicity of heavy metals, so it would be more reasonable.