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根据2006年和2013年航次对瓯江口附近海域调查的资料,分析了沉积物中重金属Cu、Pb、Zn和Cd的时空变化特征,并对其潜在生态危害进行了评价。结果表明,相比2006年,2013年调查海域表层沉积物中Cu和Zn平均含量有所增加,但经student-t检验,两组结果间不存在显著性差异,而Pb和Cd有显著性降低;与国内外其它河口相比,其含量处于中等水平。从空间分布上看,两次调查表层沉积物中重金属的空间分布有明显差异,同次调查中各重金属的空间分布总体趋势相似。通过潜在生态危害指数法对调查海域表层沉积物中重金属潜在生态风险性的评价表明,2013年调查海域重金属总的潜在生态危害指数整体属于中度生态危害水平,较2006年有明显降低。
According to the survey data of the sea near Oujiang River Estuary in 2006 and 2013, the temporal and spatial variation characteristics of heavy metals Cu, Pb, Zn and Cd in sediments were analyzed and their potential ecological hazards were evaluated. The results showed that compared with 2006 and 2013, the average contents of Cu and Zn in the surface sediments of the survey area increased in 2013, but there was no significant difference between the two groups by Student’s t test, while the contents of Pb and Cd were significantly decreased ; Compared with other estuaries at home and abroad, its content is at a medium level. From the perspective of spatial distribution, the spatial distribution of heavy metals in the surface sediments of the two surveys is obviously different. The overall trend of the spatial distribution of heavy metals in the same survey is similar. The evaluation of the potential ecological risk of heavy metals in surface sediments in the surveyed waters by the potential ecological risk index method shows that the overall potential ecological risk index of heavy metals in the surveyed waters in 2013 is of moderate ecological risk as a whole, significantly lower than that in 2006.