海南岛社会经济发展对红树林表层土壤重金属污染的影响

重金属污染属于持久性污染物，具有富集性和毒性，长时间的累积会对生态环境和人体的安全造成威胁。本研究对海南岛不同区域红树林表层土壤重金属含量与其所在市县的土地利用、社会经济发展指标和污染物排放量进行相关性分析，定量探讨社会经济发展对海南岛红树林湿地重金属污染来源的影响。相关性分析表明海南岛红树林土壤中的Zn、Ni、Hg和Co等重金属元素含量之间呈显著正相关，表明这几类重金属元素之间可能存在相似的污染源。与土地利用间的相关分析发现，随着区域建设用地面积的增加，土壤中的Cu、Zn和Hg的含量也随之增加。红树林土壤中的Cu、Zn、Hg和Co含量分别与地区发展总值呈显著正相关和极显著正相关，Cu、Zn含量与常住人口数量呈极显著正相关，表明红树林土壤中这类重金属元素可能主要来源于城市建设开发活动以及交通废气排放等。

Heavy metal contents of mangrove surface soils affected by the social and economic development in Hainan Island

Heavy metal elements are persistent pollutants which are easy to be accumulated in the environment. Those poisonous pollutions will cause serious threats to ecological security and human health because of their long-term accumulation in environment, especially in the surface sediments. To find out the effect of social and economic development on the mangrove wetlands, correlation analysis was used to address how heavy metal contents in mangrove wetlands were affected by surrounding land use/cover types, social and economic development indicators and pollutant emission of different cities in Hainan Island. The result showed there were significantly positive correlations between Zn, Ni, Hg, and Co, indicating that those heavy metal elements may come from the same or similar sources. Furthermore, it was found that both Zn and Cu contents increased with the increasing of construction land area; Cu、Zn、Hg are significantly positively correlated with GDP, while Cu and Zn are significantly positively correlated with permanent population. All mentioned above results of correlation analysis generally showed those heavy metal elements may come from urban construction and vehicle exhaust.