• 关键词：城市河网区  沉积物  磷形态  释放风险

• 基金项目：上海市青年科技英才杨帆计划项目（No.20YF1400399）；国家自然科学基金青年科学基金项目（No.52000024）；中央高校基本科研业务费专项

• 黄威
• 东华大学，环境科学与工程学院，上海 201620;中交上海航道勘察设计研究院有限公司，上海 200136

• 靳郑海
• 东华大学，环境科学与工程学院，上海 201620

• 凃成琪
• 东华大学，环境科学与工程学院，上海 201620

• 杨浩然
• 东华大学，环境科学与工程学院，上海 201620

• 陈俊伊
• 中国环境科学研究院，水污染治理与生态修复技术国家工程实验室，北京 100012

• 李川
• 中交上海航道勘察设计研究院有限公司，上海 200136

• 王书航
• 中国环境科学研究院，水污染治理与生态修复技术国家工程实验室，北京 100012

• 尚晓
• 中交上海航道勘察设计研究院有限公司，上海 200136;中国环境科学研究院，水污染治理与生态修复技术国家工程实验室，北京 100012

• 摘要：以嘉兴城市河网区为研究区域，在调查区域水质和沉积物磷空间变化特征的基础上，分析沉积物中各形态磷的垂直与空间赋存状态，通过吸附释放参数计算EPC₀值，明确了沉积物-水界面磷迁移影响因素和沉积物中活跃磷素的释放风险和贡献.结果表明，研究区域水质氮磷污染较为严重，沉积物TP含量均值呈北部河网区>西部河网区>南部河网区，基于单因子指数法的生态风险评价为Ⅱ、Ⅲ和Ⅳ级的样本比例分别为10.91%、25.45%和63.64%.沉积物各形态磷整体呈现TP>IP>HCl-P>NaOH-P>OP，沉积物生物有效磷（BAP）整体呈现Olsen-P>AAP>WSP>RDP；在沉积物垂直剖面中，部分位点受到外界因素的强烈影响垂向波动较大，整体上是随深度的递增而减小，这与近年来研究区域接收的外源磷积累过程在加重有关.相关性分析表明，沉积物磷吸附容量（Q_max）与铁铝氧化物呈显著相关性 （p<0.05）；释放参数EPC₀与TP、IP与HCl-P呈显著相关性 （p<0.05）.结合BAP形态，研究区域河流沉积物NaOH-P、HCl-P、AAP、Olsen-P及WSP存在较高的释放潜力.南部河网区沉积物主要呈现磷“源”角色，西部和北部河网区部分区域沉积物充当磷“源”角色.南部河网区在长短时间尺度下的磷主要释放形态为NaOH-P、HCl-P和OP，北部河网区在长时间尺度下主要释放磷形态为NaOH-P、HCl-P，西部河网区在短时间尺度下主要释放形态以HCl-P为主，在长时间尺度下3种磷形态的释放风险仍然较高.

• Abstract：Based on investigation of the phosphorus （P） concentration for spatial variation characteristics in the water quality and sediments phosphorus taking the urban river network in Jiaxing City as the research area， this study analyzed the vertical and spatial existence status of various phosphorus fractions in sediments， and calculated EPC₀ value by P adsorption and release parameters， and clearly clarified influence factors affecting the P migration in the sediment-overlying interface and the release risk and contribution of active phosphorus in the sediment. The results showed that the nitrogen and phosphorus in overlying water inform the urabn river network were more serious. Average total phosphorus （TP） content of sediments was in the order of northern river network > western river network > southern river network. The ecological risk assessment based on the single-factor index method was II， III and IV， and the proportions of samples with grades were 10.91%， 25.45% and 63.64% respectively. Various phosphorus fractions content of the sediments were generally TP>IP>HCl-P>NaOH-P>OP， and bioavailable phosphorus （BAP） content of the sediments were generally Olsen-P>AAP>WSP>RDP. BAP contents in sediments from some sample sites were strongly influenced by external factors in vertical profiles， and the BAP from most areas were reduced as the depth was increased， which was relaterd to aggravation of the exogenous phosphorus accumulation process received in the study area in recent years. Correlation analysis showed that P adsorption capacity （Q_max） were significantly correlated with iron and aluminum oxides （p<0.05）. P release parameter （EPC₀） was significantly correlated with TP、IP and HCl-P （p<0.05）. Considering the BAP fractions， NaOH-P， HCl-P， AAP， Olsen-P， WSP of river sediments in the study area had higher release potential. The sediments of the southern river network mainly played the role of P sources， while the sediments of parts of the western and northern river network played the role of P sources. The main P release fractions of sediments were NaOH-P， HCl-P and OP in a long and short time scale from the southern river network. The main P release fractions of sediments from the northern river network was NaOH-P and HCl-P in a longer time scale. The main P release fractions of sediments in the western river network was HCl-P， while the three phosphorus of sediments in the western river network still had higher release risks in a longer time scale.

• Key words：urban river net region  sediment  phosphorus forms  release risk

• 
  摘要点击次数： 190 全文下载次数： 268