摘要
为探索入湖河流沉积物磷的地球化学行为及生态风险,选择典型入湖河流—十里河,应用地球化学分析方法和原位高分辨采样技术,对沉积物磷的时空分布规律开展研究.结果表明,十里河入湖口沉积物总磷的污染指数大于1,属于严重污染;进一步通过沉积物总磷的富集指数和N/P比发现,该区域沉积物磷属于轻中度富集,主要是由于外源输入导致的.9月份沉积物中溶解态磷的平均浓度(0.48 mg·L^(-1))、平均释放通量(0.29 mg·m^(-2)·d^(-1))以及有效态磷通量(206.75 pg·cm^(-2)·s^(-1))均显著高于其他监测月份,水体温度、pH及溶解氧是影响沉积物磷迁移的重要因素.此外,沉积物溶解态磷的释放通量与水体总磷浓度呈显著正相关关系,表明沉积物磷释放是导致河流水体总磷增加的重要原因.本研究揭示了入湖河流沉积物磷的地球化学行为及其对湖泊水质的潜在生态风险,强调了沉积物磷释放对水体磷浓度及入湖磷负荷的影响,为河湖水体污染控制和生态保护提供了科学依据.
Based on the spatiotemporal distribution of phosphorus(P)in sediments of a typical urban into-lake river—Shili River,determined by both geochemical analysis methods and in-situ high-resolution sampling techniques,the geochemical behavior and ecological risks of P in sediments were explored.The results showed that the pollution indexes of total phosphorus(TP)were greater than 1,suggesting that the river sediments were severely polluted.Enrichment index of TP and the N/P ratio revealed that the P in sediments of Shili River was lightly to moderately enriched,resulted from the external loading.The concentration of dissolved P(0.48 mg·L^(-1))in sediments,and the release flux of both dissolved P(0.29 mg·m^(-2)·d^(-1))and labile P(206.75 pg·m^(-2)·s^(-1))were significantly higher in September than that in other monitored months.Water temperature,pH,and dissolved oxygen were identified to be the important factors affecting the P mobilization in sediments by correlation analysis.In addition,the release flux of dissolved P from sediments was significantly positively correlated with the TP concentration in water column,indicating that sediment P release was an important reason for an increase in TP in the river.This study reveals the geochemical behavior of P in sediments and its potential ecological risks to lake water quality,and emphasizes the impacts of sediment P release in urban into-lake rivers on water P concentration and P loading into lakes,which provides a scientific basis for pollution control and ecological protection of river and lake waters.
作者
沈逸伦
李财
孙全
裴康越
曾招财
李霁
王晓龙
于江华
邱慧
丁士明
SHEN Yilun;LI Cai;SUN Quan;PEI Kangyue;ZENG Zhaocai;LI Ji;WANG Xiaolong;YU Jianghua;QIU Hui;DING Shiming(School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044;Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 211135;Changjiang Ecology and Environmental Protection Group Co.,Ltd.,Wuhan 430014;School of Energy and Environment,Southeast University,Nanjing 210018)
出处
《环境科学学报》
北大核心
2025年第4期231-239,共9页
Acta Scientiae Circumstantiae
基金
长江生态环保集团有限公司河湖连通型河道蓝藻治理科技创新团队项目(No.YEEC-KCTD-202206)
NSFC-云南联合基金(No.U210220263)
国家自然科学基金(No.42407535)
江苏省自然科学基金(No.BK20241697)。
关键词
入湖河流
沉积物磷污染
时空分布
原位高分辨采样技术
风险评估
into-lake rivers
sediment phosphorus pollution
spatiotemporal distribution
in-situ high-resolution sampling technology
risk assessment
