[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 resuspension. 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.