雷州半岛红树林土壤重金属空间分布特征及来源分析

运用潜在生态风险指数法和相关性分析方法对雷州半岛红树林土壤11种重金属（As、Cd、Co、Cr、Cu、Hg、Mn、Ni、Pb、V、Zn）进行生态风险评价和来源分析。结果表明，Hg、As、Cu、Zn等4种重金属元素含量在个别采样区超过国家土壤环境质量一级标准；As、Cd、Co、Cr、Cu、Hg、Mn、Ni和Zn等9种元素含量平均值超过环境背景值。雷州半岛红树林湿地土壤重金属总的潜在生态风险程度处于中等污染水平，其中Hg元素为强污染，Cd元素为中等污染，其他元素为轻微污染。从空间分布看，南山和观海长廊采样区重金属污染为强污染，企水镇采样区为轻微污染，其他采样区为中等污染。重金属元素的富集与土壤自然特性和人为排放密切相关，黏土含量和有机质含量较高的土壤、工业较发达、人类活动较强等区域土壤重金属生态风险程度较强。

Distribution characteristics and source analysis of heavy metals in soils from mangrove forest in Leizhou Penisula

The ecological pollution risk assessment and heavy metal source identification of 11 heavy metals (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, V, Zn) in soils from mangrove forest in Leizhou Penisula have been respectively carried out by using potential ecological risk index and correlation analysis method.The result shows that the content of heavy metals (Hg, As, Cu, Hg) in individual sampling area exceeded national standard.The average content of 9 heavy metals (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Zn) was more than the environmental background value.The total potential ecological risk of soil heavy metals is at moderate level in Leizhou Penisula.The Hg element was in strong environmental pollution and the Cd element was in secondary environmental pollution, while other elements were light pollution.From the spatial distribution, the pollution level of heavy metals in soils was in strong environmental pollution in Nanshan and View Sea Corridor sample area, while light pollution in Qishui sample area and secondary pollution in other sample areas.Enrichment of heavy metal elements was closely related to the natural features of soil and man-made emissions.The soils with higher clay content and organic matter content were in the highest potential ecological risk.The regions with more developed industry and strong human activity were more serious in the ecological risk of heavy metal pollution.