【摘要】：以太湖流域不同分區(qū)水體表層沉積物為研究對象,通過對流域表層沉積物103個點位的氮、磷(TN、TP)和8種重金屬(Hg、As、Cu、Zn、Pb、Cd、Ni、Cr)的分析,對氮、磷和重金屬空間分布特征和生態(tài)風(fēng)險進行評價.結(jié)果表明,表層沉積物TN含量呈現(xiàn):Ⅱ11區(qū)(湖西丘陵區(qū))Ⅱ21區(qū)(無錫虞農(nóng)田區(qū))Ⅱ12區(qū)(浙西山區(qū))Ⅱ23區(qū)(滬蘇嘉農(nóng)田區(qū))Ⅱ22區(qū)(太湖濕地區(qū)),其值介于550~3453mg/kg之間.TP含量分布為Ⅱ23區(qū)Ⅱ21區(qū)Ⅱ22區(qū)Ⅱ11區(qū)Ⅱ12區(qū),其值介于320~2481mg/kg之間.太湖流域水體表層沉積物重金屬的含量分布特征為Ⅱ23區(qū)、Ⅱ21區(qū)較高,Ⅱ12區(qū)、Ⅱ11區(qū)、Ⅱ22區(qū)較低.綜合污染指數(shù)評價(FF)對營養(yǎng)鹽評價結(jié)果表明,太湖流域水體表層沉積物氮磷污染情況嚴(yán)重,整個太湖流域水體表層沉積物營養(yǎng)鹽污染等級呈現(xiàn):Ⅱ12區(qū)整體Ⅱ21區(qū)Ⅱ11區(qū)Ⅱ23區(qū)Ⅱ22區(qū)的分布.重金屬綜合潛在生態(tài)風(fēng)險指數(shù)(RI)表明,太湖流域水體表層沉積物重金屬污染呈現(xiàn)Ⅱ21區(qū)最高,其次是Ⅱ23區(qū)、Ⅱ12區(qū)、Ⅱ22區(qū),最低為Ⅱ11區(qū).進一步運用地積累指數(shù)法(Igeo)表明,太湖流域表層沉積物重金屬As、Cu、Zn、Pb、Ni、Cr污染狀況較輕,而潛在生態(tài)危害指數(shù)法(Er)表明Hg、Cd的風(fēng)險等級高,是造成太湖流域水體表層沉積物生態(tài)風(fēng)險的主要因素.
[Abstract]:The surface sediments of different subzones of Taihu Lake Basin were studied. The nitrogen, phosphorus (TN,TP) and eight heavy metals (Hg,As,Cu,Zn,Pb,Cd,Ni,Cr) of 103 sites of surface sediments in Taihu Lake Basin were analyzed. The spatial distribution characteristics and ecological risk of phosphorus and heavy metals were evaluated. The results showed that the content of TN in surface sediments was as follows: zone 鈪，

本文編號：2400769