Variation of phosphorus bioavailability in the re-suspended sediments

The variation of phosphorus (P) bioavailability in terms of water soluble P (WSP), readily desorbable P (RDP), algal available P (AAP-), and NaHCO ₃, extracting P (Olsen-P) in the re-suspended sediments was investigated in laboratory experiments, in vhich the waters and sediments were taken from campus canal. The results indicate that sediment re-suspension can promote the migration of soluble reactive P (SRP) from overlying water to sediments. The extents of AAP and Olsen-P in re-suspended sediments reduced obviously, whereas the values of the sediments in the control increased slightly, compared with the initial state, indicating that the P bioavailability in the sediments could be reduced evidently due to sediment re-suspension. The content and characteristics of iron-bound P (BD-P) significantly affect the formation of AAP. The formation of Olsen-P has close relationship with the contents of BD-P, aluminium-bound P (Al-P), and organic P (NaOH-nrP).