• 关键词：沉积物  重金属  闽江福州段  内河

• 基金项目：福建省自然科学基金(No.2014J01151);福建省科技计划项目公益类项目(No.K3-296,2014R1034-2,2013R02)

• 方红
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建省湿润亚热带山地生态省部共建国家重点实验室培育基地, 福建师范大学地理科学学院, 福州 350007

• 陈秀玲
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建省湿润亚热带山地生态省部共建国家重点实验室培育基地, 福建师范大学地理科学学院, 福州 350007

• 张雪琼
• 福建省湿润亚热带山地生态省部共建国家重点实验室培育基地, 福建师范大学地理科学学院, 福州 350007

• 李金婵
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建省湿润亚热带山地生态省部共建国家重点实验室培育基地, 福建师范大学地理科学学院, 福州 350007

• 杨红玉
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建省湿润亚热带山地生态省部共建国家重点实验室培育基地, 福建师范大学地理科学学院, 福州 350007

• 摘要：为了探讨城市内河对闽江福州段重金属污染的影响特征,本文对闽江福州段和福州城市主要内河表层沉积物中的Cr、Ni、Cu、Zn、As和Pb6种重金属元素进行了系统的分析,并采用地累积指数法和潜在生态风险评价法进行污染情况和潜在危险评估.研究结果表明,表层沉积物中重金属Cr、Ni、Cu、Zn、As和Pb含量范围分别为:5.55~131.35、0.74~138.82、2.45~95.84、24.24~609.72、2.82~95.90、13.91~108.45mg·kg^-1,各重金属含量平均值明显高于福建省土壤环境背景值,但低于国家土壤环境质量Ⅱ类标准值(除As略高于Ⅱ类标准).地累积指数法评价结果表明,表层沉积物中重金属大多为无污染或中污染程度,受人类活动影响强烈.潜在生态风险评价法表明,表层沉积物中重金属Cr、Ni、Cu、Pb和Zn存在轻微潜在风险,As以中等潜在风险为主,总体存在轻微潜在风险.重金属污染物的空间分布与福州市的发展格局相适应,人类活动集中的老城区和工业密集区,是闽江与内河重金属污染物含量相对较高的区域.城市内河汇入闽江后,携带的大量重金属污染物加剧了闽江重金属污染.建议加强对闽江重金属含量较高的晋安河段、光明港段-磨溪河段的污水排放监控.

• Abstract：In order to investigate the influence of urban river on heavy metals pollution in sediments of Minjiang River (Fuzhou Section), six heavy metals (Cr, Ni, Cu, Zn, As and Pb) in major river surface sediment of Minjiang River (Fuzhou Section) and Fuzhou city were systematically analyzed. Evaluation for the geological accumulation index and potential ecological risk index were performed. The results show that the concentrations of Cr, Ni, Cu, Zn, As and Pb were: 5.55~131.35, 0.74~138.82, 2.45~95.84, 24.24~609.72, 2.82~95.90, 13.91~108.45 mg·kg^-1, Respectively. The average concentrations of six heavy metals are higher than those in the the background soil in Fujian, but lower than the Class II soil environment quality standards except As. Based on the geological accumulation index of heavy metals, most of samples are considered as between contamination-free and moderate contamination, predominantly associated with the human activities. The potential ecological risk index (E_rⁱ) results illustrate the heavy metal content of most of samples (Cr, Ni, Cu, Pb and Zn) have slight potential risks, while As is in moderate risk. For the whole basin, six heavy metals content have slight potential risks. The spatial distribution of heavy metals pollutants should be related to urban development of Fuzhou city. Relatively serious contaminated segments of Minjiang River and urban river are surrounded by old town and industrial zones with strong human activities. This indicates contaminated urban rivers carry a large number of heavy metal pollutants into Minjiang River, aggravate the heavy metals pollution. In order to curb sewage pollution, our results suggest some monitoring stations should be considered to build in this relatively to serious heavy metal pollution area, such as Jin'an river section and Guangminggang-Moxi river section.

• Key words：sediment  heavy metals  Minjiang River (Fuzhou Section)  urban rivers

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