中文摘要：

通过室内试验模拟沉积物在不同频率下的悬浮过程,研究了悬浮频率对颗粒态磷生物有效性的影响.结果表明,沉积物悬浮导致颗粒态磷的生物有效性显著降低,30d时,藻类可利用态磷（AAP）占悬浮物总磷（Tot-P）的百分比仅为初始状态（56.75%）时的26.24%（悬浮频率较小）和20.04%（悬浮频率较大）.内源磷形态分析表明,尽管悬浮物中铁铝结合态磷（Fe/Al-P）含量呈增加的趋势,但非闭蓄态Fe/Al-P（即AAP）占Fe/Al-P的比重却明显降低.这主要与沉积物悬浮导致溶解氧融入（溶解氧从初始状态时的3mg.L-1增至试验结束时的6mg.L-1）和pH值改变（pH值从初始状态时的8.02分别降至7.80（悬浮频率较小）和7.60（悬浮频率较大））有关.沉积物悬浮导致水体中可被利用颗粒态磷（BAPP）和溶解态磷（DTP）含量降低,从而导致上覆水中生物有效磷（BAP）含量降低.

英文摘要：

Lab-scale experiments were conducted to investigate the effect of sediment resuspension under different frequency conditions on bio-availability of particulate phosphorus（PP） in the overlying water.The results show that the bio-availability of PP decreased obviously under sediment resuspension conditions,compared with the initial state.After 30 d,the percentages of algal available phosphorus（AAP） to total phosphorus（Tot-P） in suspended solids were 26.24%（lower frequency） and 20.04%（higher frequency） of the initial state（56.75%）,respectively.Sequential fractionation indicated that the proportions of non-occluded Fe/Al-P（AAP） to Fe/Al-P decreased gradually under sediment resuspension conditions with time increasing,although the concentrations of Fe/Al-P increased markedly in suspended solids.This was attributed to dissolved oxygen（DO） penetration and pH values change.Under sediment resuspension conditions,DO concentrations increased from 3 mg.L-1（initial state） to 6 mg.L-1（the end）.In addition,pH values decreased from 8.02（initial state） to 7.80（lower frequency） and 7.60（higher frequency）,respectively.The concentrations of bio-available particulate phosphorus（BAPP） and dissolved total phosphorus（DTP） reduced under sediment resuspension conditions.Correspondingly,the content of bio-available phosphorus（BAP） decreased in the overlying water,compared with the initial state.