再悬浮条件下底泥中磷赋存形态的转化研究

以富营养化河流的底泥和上覆水为材料,研究了底泥再悬浮条件下,磷的赋存形态的变化特征,并对不同形态磷之间可能的转化途径进行了探讨.结果表明,底泥再悬浮条件下,磷的释放及吸附均与底泥再悬浮的频率密切相关.再悬浮导致底泥中不同形态磷的数量分布发生了明显变化. BD-P和NaOH-nrP的含量显著减少,而Ca-P的含量明显增加,其余各形态磷的变化幅度很小.这表明, BD-P和NaOH-nrP可能转化成Ca-P.而潜在活性磷与生物有效磷的形成量也表明,底泥再悬浮促进了易释放态磷与生物有效磷向难释放态磷与难被生物利用态磷的转化,并且这种促进作用随着底泥再悬浮的频率的增加而增加.

Transformation of Phosphorus Forms in the Sediments Under the Conditions of Sediments Re-suspension

The change of phosphorus forms in sediments was studied and the possible path of transformation from mobile phosphorus into refractory forms was discussed under the conditions of sediments re-suspension, using sediments and overlying water from the trophic canal in the campus as material. The results showed that phosphorus release and adsorption had close relationships with the frequency of sediments re-suspension. Various changes of different forms of sedimentary phosphorus were found under the conditions of sediments re-suspension. BD-P and NaOH-nrP were decreased obviously, while Ca-P was increased evidently. The change of other phosphorus forms was little. As a result, BD-P and NaOH-nrP could be transformed into Ca-P. Moreover, based on the formation of potentially mobile phosphorus(PMP) and bioavailable phosphorus(BAP), sediments re-suspension could improve the transformation from mobile phosphorus and bioavailable phosphorus into refractory forms and nonbioavailable forms, and the enhancement was improved with the increase of the frequency of sediments re-suspension.