统计分析了2015-2016年太湖西岸宜兴城市水体中悬浮质(SS)的浓度、组成、时空分布特征,及其与营养盐的关系,并实测了4条典型河段SS静沉降效果分析沉降过程中SS浓度、磷浓度的变化规律.结果表明:SS浓度的变化范围为5.5～244.0 mg/L,平均值为(54.5±33.8) mg/L;SS组成以无机悬浮质(ISS)为主,平均占比为66.9％;空间上呈现出西沈＞东沈＞团氿的变化特点,航运河段显著高于其他河段;季节变化表现为秋季＞春季、夏季＞冬季,且冬季显著偏低.同时发现水体中SS和总磷(TP)呈显著正相关(P＜0.01),和总氮(TN)无相关关系;SS浓度随沉降时间呈指数衰减关系,初始浓度越高,降低幅度越大;初始颗粒态磷(PP)占比高有利于TP浓度的降低,占比低则易转化为溶解态磷(DTP).%The concentration,composition and spatial-temporal distribution of suspended solids (SS) were characterized from urban rivers in Yixing City,Western Taihu Lake.Furthermore,the relationships between SS and nutrients (TN and TP) were also analyzed.Taken four typical rivers as examples,the variations of SS and phosphorus concentrations were investigated during the process of hydrostatic sedimentation.Results showed that the concentration of SS ranged from 5.5 to 244.0 mg/L,with an average of (54.5 ±33.8) mg/L,a majority (66.9％) of which were inorganic matters.Spatially,SS concentration ranked as follows:Xijiu ＞ Dongjiu ＞ Tuanjiu.SS concentration in navigation rivers was significantly higher than the other rivers.Seasonally,SS concentration was the highest in autumn,and the lowest in winter.Furthermore,significantly positive correlation was observed between SS and TP (P ＜ 0.01).The concentration of SS decreased exponentially during the settling process,and higher SS concentration and particulate phosphorus (PP) enhanced the sedimentation of SS and TP.A smaller percentage of PP in TP was easier for PP to convert into dissolved total phosphorus (DTP).
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