松滋河河口段泥沙特征及潜在生态风险评价

Sediment characteristics and potential ecological risk assessment of Songzi River estuary

本文对松滋河河口段不同区域泥沙进行取样,分析了各河段泥沙粒径、化学组分、重金属含量等指标,进而对泥沙潜在生态风险进行评价。结果表明,河口段泥沙以中细砂为主,松滋河大口下游含沙量高于上游;SiO_(2)、Al_(2)O_(3)和CaO是泥沙的主要化学成分;主要重金属指标均低于国家土壤污染风险筛选值;从潜在生态风险评价来看,总体属于低潜在风险,可以用于农林资源化利用,但需要关注镉污染风险。研究结果可为河口区泥沙资源化利用提供参考。

In this paper,the sediment in different areas of Songzi River estuary was sampled,and the indexes of sediment particle size,chemical composition,heavy metal content and so on were analyzed,and then the potential ecological risk of sediment was evaluated.The results show that the sediment in the estuary is mainly medium-fine sand,and the sediment concentration in the lower reaches of Songzi River mouth is higher than that in the upper reaches.SiO_(2),Al_(2)O_(3) and CaO are the main chemical components of sediment,and the main heavy metal indexes are lower than the national soil pollution risk screening value.From the perspective of potential ecological risk assessment,it is generally low potential risk,which can be used for agricultural and forestry resource utilization,but it is necessary to pay attention to the risk of cadmium pollution.The research results can provide reference for the utilization of sediment resources in estuary area.