采用SMT和Psenner分级提取法分别测定了北运河（北京段）底泥总磷和各结合态磷的含量，结果表明，春季北运河底泥TP平均含量为1 086.29 mg/kg，含量偏高，属严重污染；各结合态磷平均含量顺序为Ca-P>Al-P>Fe-P>NH4Cl-P> Res-P>Org-P，相同结合态磷的含量在不同采样点存在明显差异。通过对各结合态磷与上覆水质的相关性分析发现，北运河（北京段）底泥TP含量主要受NH4Cl-P、Fe-P、Al-P和Res-P影响，其中Al-P的影响最大；NH4Cl-P、Fe-P、Al-P和Res-P均与上覆水含磷量显著相关，其中BAP（BAP≈NH4Cl-P+Fe-P+Al-P）平均含量达到TP的48.63%，且与上覆水含磷量极显著相关，说明底泥磷特别是BAP的转化释放是引起上覆水体富营养化的重要因素。

The contents of total phosphorus and phosphorus fractions in sediments of Beiyun River in Beijing were determined by the SMT and Psenner sequential fractionation method. The results showed that the average content of TP is 1086.29 mg?kg-1, indicating heavy pollution in the river. The order of average content of phosphorus fractions was Ca-P>Al-P>Fe-P>NH4Cl-P>Res-P>Org-P, and the contents of the same phosphorus fractions can vary significantly at different sampling locations. According to the correlation analysis between phosphorus fraction and overlying water quality, the TP content of Beiyun River was mainly affected by NH4Cl-P, Fe-P, Al-P, and Res-P, and Al-P had the greatest effect. NH4Cl-P, Fe-P, Al-P, and Res-P had significant correlations with the phosphorus content of the overlying water. The average content of BAP (BAP≈NH4Cl-P+Fe-P+Al-P) accounted for 48.63% of TP. The contents of phosphorus, especially BAP, in sediments have significant impacts on the eutrophication of water quality in Beiyun River.

国家重大水专项（2008ZX07209)