Bioavailable Phosphorus on Suspended Solids of Lake Under Short-term and Repeated Sediment Disturbance

Variation of bioavailable phosphorus forms on suspended solids under short-term and repeated sediment disturbance was investigated,using sediments and overlying water from Meiliang Bay and Yueliang Bay. The results showed that the average percentage of algae available phosphorus( AAP) in the dissolved total phosphorus( DTP) decreased with the increase of disturbance number. The NH4Cl-P and bioavailable particulate phosphorus( BAPP) on the suspended solids increased by 3. 5%,37. 3%( Meiliang Bay) and2. 0%,50. 7%( Yueliang Bay),respectively. In addition,the AAP and its percentage of AAP in Tot-P on the suspended solids in Meiliang Bay increased with the increase of disturbance number. However,the case was the opposite for Yueliang Bay. During the disturbance,the BAPP was higher than the sum of NH4Cl-P and AAP,indicating that the sum of NH4Cl-P and AAP constituted 80%of BAPP. It also suggested that estimating the BAPP on the suspended solids using the sum of NH4Cl-P and AAP is problematic.