城市河道沉积物有机质时空分布及腐殖质赋存特征

Temporal and Spatial Distribution of Organic Matter and Chemical Speciation of Humus in Urban River Sediments

选取东南沿海地区两个城市的四条河道,对其沉积物有机质时空分布及腐殖质赋存特征进行研究,结果表明：四条河道沉积物有机质含量的变化范围为11.37～178.64g/kg,平均值为48.83g/kg;沉积物有机质含量在不同河道间的变化较大;同一河道内不同点位的沉积物有机质含量的空间分布均匀性差异较大;不同河道的沉积物有机质含量随时间（季节、水文周期）呈现不同的变化规律;四条城市河道沉积物的有机质、和腐殖质时空分布及其赋存特征不仅与污染源有关,而且与其治理措施和水文条件有关,与季节变化、河床形态有关。

The temporal and spatial distribution of organic matter and the chemical speciation of humus in sediments from four different urban rivers in two cities in southeast coast of China were investigated.The results showed that the organic matter content in sediments varied from 11.37-178.64g/kg with a mean value of 48.83g/kg.The content of organic matter in sediments was significantly different for different rivers.The spatial distribution characteristics of sediment organic matter within each river studied were also significantly different.Different temporal（season and hydroperiod）variations of sediment organic matter were observed for different rivers studied.The temporal and spatial distributions of organic matter as well as the speciation of humus in sediments from four urban rivers were not only related with pollution sources,treatment measures and hydrologic conditions,but also with seasonal variation and river morphology.