中文摘要：

通过对南通市区5条主要河道柱状底泥样品磷含量的实验分析,探讨河道磷污染的分布特征.结果表明：市区河道磷的背景值约为1.00 mg·g^-1,磷污染深度约为35 cm.磷污染在空间分布上明显受到了河道＂引清挤污＂治理措施的影响：在水平分布上,随着引水距离的增加,江水冲污的影响逐渐消失,磷污染逐渐加重,引水冲污的有效距离估算为5 km;在垂直分布上,大部分河道表现出＂表层富积＂现象,随着深度的增加,磷污染程度逐渐降低并趋于稳定.少数河段＂中层高、上下层低＂的磷污染特征,可能与历史时期河道治理有关.此研究可为南通市河流污染防治和河道治理提供科学依据.

英文摘要：

Sediment cores taken from five urban channels were sampled to analyze the phosphorus content and reveal the distribution of phosphorus pollution in Nantong city. The experimental results show that the background value of phosphorus of river sediment in Nantong city was about 1.00 mg·g^-1 and the pollution depth was about 35cm. Affected by water diverted from Yangtze River to control pollution, urban channels in Nantong city showed different spatial distribution of phosphorus pollution from those of other cities. In horizontal distribution, phosphorus pollution was aggravated with increased diversion distance and the diversion effective distance was estimated to 5 km. While in vertical distribution, phosphorus pollution was heavier in top section than in bottom section, and it gradually decreased and stabilized with depth increased. However, a few sites showed the trends that phosphorus pollution was heavier in middle section than that in top and bottom sections, which may be contributed to the measures of the river regulation. This study can help accumulate data and information for the prevention and treatment of pollution in the urban rivers.