太湖不同污染程度底泥对磷滞留能力的比较

磷(P)是湖泊富营养化的限制性营养元素,而沉积物是湖泊营养物质的重要蓄积库,沉积物对P的滞留能力是决定湖泊自净能力的重要因素。采用室内有机玻璃圆柱装置,研究了太湖两种污染程度不同的底泥对P的滞留能力。结果表明,污染程度较轻的黄泥在实验期间对P的最大滞留量为28.365μmol·m-2,污染程度较重的黑泥最大滞留量仅为9.321μmol·m-2,两种底泥对P的滞留具有极显著的差异(P<0.01)。与实验初期相比,实验末期黄泥中总磷增加0.06%,而在黑泥中却减少0.02%,黄泥对P的滞留能力远远大于黑泥。

Phosphorus Retention Capacity of Sediments with Different Pollution in Taihu

Phosphoms(P)is a limited nutrient oflake eutrophication.Sediment is the important nutrient pool of lake ecosystems,and P re-tenfion capacity of sediment is an important factor determining the self-purification capacity of hkes.This paper studied the P retention ca-pacity of the sediments with different pollution(eutrophication)in Taihu.The results showed that the maximum P retention of yellow sediment with less poHution WaS 28.365 μmol·m~(-2),but that of black sediment with more pollution wag only 9.321 μmol·m~(-2).There was significant difference between the P retention capacity of two different sediments(ANOVAP<0.01).The TP of yellow sediment at the end of the ex-periment increased 0.06%,but that of black sediment decreased 0.02%.Our research indicated that the capacity of yellow sediment P reten-tion was far stronger than that of the black sediment.