首页> 中文期刊> 《海洋科学》 >胶州湾滨海湿地盐渍土壤中重金属的聚集与分散特性研究

胶州湾滨海湿地盐渍土壤中重金属的聚集与分散特性研究

             

摘要

Soil salinization is a worldwide resource and ecological problem, and systemic study on saline soil is the foundation for its bioremediation. The accumulation/dispersion of heavy metals in the saline soils was discussed based on the research on the saline soils in the northeastern coastal wetland of Jiaozhou Bay. The variations of Cu and Zn concentrations in saline soils of the Jiaozhou Bay northeastern coast were great and their concentrations were higher than the soil background values; the concentrations of Pb, Cd and Cr had little difference between sample stations but were higher than the background values; the variations of As and Mo concentration were not prominence and their concentrations were lower than the background values; the distribution was similar to V ,Co and Ni, the concentrations of which in the northern part were somewhat higher than the soil background values whereas in the southern part were slight lower than the soil background values. Cu, Zn, Cr, Cd, Pb, and Ni were "elements accumulated by saline soil" and As, Co, V, Mo "elements dispersed by saline soil". As, Co, Ni, V, Mo, Cu, Zn and Pb of saline soils in the northeastern coast of the Jiaozhou Bay mainly came from soil parent materials and were not influenced by anthropogenic activities, whereas Cr and Cd mainly originated from industrial and agricultural inputs by Qingdao besides the parent materials. Pb and Zn in most of the saline soil were not polluted, but light polluted in some areas of the northeast coastal in the Jiaozhou Bay. Half of the studied stations had no pollution of Cu and Cr, but the other half stations were polluted slightly by Cu and Zn. However, there was mild to moderate pollution for Cd. The pollution severity of the heavy metals in the region followed the order of Cd〉〉Cu〉Cr〉〉Zn〉 Pb〉〉Ni〉V 〉Co〉As〉Mo. Beside the effect of material source, the concentrations of heavy metals in saline soils of the northeastern coast of the Jiaozhou Bay were influence by the nature of heavy metals and vegetation on the soil. The dominant halophyte Suaeda Salsa can significantly absorb Pb and Cd from the saline soil, so alleviating the corresponding contamination of the soil.%以胶州湾东北沿岸盐渍土壤为主要研究对象,分析探讨了滨海盐渍土壤对10种微量重金属的聚集/分散特征。结果表明,胶州湾东北沿岸盐渍土壤中Cu、Zn、Pb、Cd、As、Cr、Co、Ni、V、Mo主要来源于成土母质花岗岩的风化产物,Cu、Zn、Cr、Cd、Pb、Ni为“盐渍土壤聚集元素”,As、Co、V、Mo为“盐渍土壤分散元素”。盐渍土壤中As、Co、Ni、V、Mo基本没有受到人为污染,Pb、Zn大部分区域无污染,局部区域有轻度污染,Cu和Cr在一半的区域无污染,在另一半的区域有偏轻度污染,Cd则存在轻到中度污

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