中文摘要：

研究沉积物磷的吸附参数、形态及其含量,揭示锦江河及其支流沉积物磷吸附行为的变化特征及其环境意义,阐明锦江河及其支流富营养化风险。2016年1月,在锦江河及其支流9个样点用彼得森采泥器采集表层沉积物,测定磷吸附平衡浓度（EPC0）,计算沉积物磷吸附指数（PSI）、磷吸附饱和度（DPS）以及其衍生出的磷释放风险指数（ERI）。结果表明,锦江河沉积物4种形态磷含量顺序为CaCO3-P〉Fe（OOH）-P〉ASOP〉P（alk）,CaCO3-P是沉积物磷的主要存在形态;钙结合态磷（CaCO3-P）和磷最大吸附量（Q（max））显著正相关;沉积物中PSI为11.24-31.37（mg P/100 g）/（μmol/L）,平均值为21.28（mg P/100 g）/（μmol/L）,且PSI与Q（max）显著正相关;DPS值在水平方向上和垂直方向上的分布均与PSI值的分布相似;EPC0在各支流分别从上游到下游逐渐减小,下游的沉积物磷释放潜能相对上游较小;EPC0的垂直分布表明,对大多数河段来说,疏浚并不能减小沉积物磷释放风险;所有采样点的ERI在水平方向上均超过了25%,各采样点沉积物磷潜在释放诱发富营养化的风险均为高度风险。

英文摘要：

Sediment plays an important role in the nutrient dynamics of shallow lakes. Even if exogenous phosphorus loading declines,lake and river water quality can continue to deteriorate because of endogenous phosphorus released from sediments. In this study,we studied phosphorus absorption behavior in Jinjiang River and its tributaries,focusing on the speciation of phosphorus,equilibrium phosphorus concentration（ EPC0）,the phosphorus sorption index（ PSI） and the degree of phosphorus saturation（ DPS）. The eutrophication risk index（ ERI） of phosphorus release from sediments in Jinjiang River was also evaluated,based on the results. In January of 2016,near-surface sediment from different depths was sampled from nine sampling sites of Jinjiang River and its tributaries（ DJ1-5,XJ 1-2,JJ1-2） using a core sampler. Phosphorus absorption parameters were determined for all samples. Phosphorus in sediments of Jinjiang River exists in four forms： bound to calcium（ CaCO3- P）,bound to iron [Fe（ OOH） - P],acid soluble organic（ ASOP） and phosphate contributing to alkalinity（ P（alk）） and occur in the order CaCO3- P 〉 Fe（ OOH） - P 〉 ASOP 〉 Palk）. The range of CaCO3- P was 103. 7-269. 1 mg/kg and was positively correlated with the maximum adsorption capacity（ Q（max））. The range of PSI in sediments was 11. 24-31. 37（ mg P/100 g）/（ μmol/L）,with an average value of 21. 28（ mg P/100 g）/（ μmol/L） and there was a significantly positive correlation with Q（max）. The horizontal and vertical distribution of DPS was similar to that of PSI.The EPC0 decreased gradually from the upper to lower reaches in each tributary,indicating a lower phosphorus release potential in the lower reach. The ERI of all sampling sites was over 25%,indicating that all sampling sites pose a high eutrophication risk due to release of phosphorus from the upper sediment. Minimum values of EPC0 were found at the surface only at stations DJ4 and DJ5,indicating that dredging will not effectively r