巢湖十五里河入湖区夏季底泥磷的释放通量估算

Release Flux Estimation of Sediment Phosphorus in Shiwuli River Estuary of Chao Lake in Summer

[目的]估算巢湖十五里河入湖区夏季底泥磷的释放通量。[方法]以巢湖为研究对象,分别研究静态和动态条件下巢湖十五里河入湖区底泥磷的释放规律,从而估算出该区夏季底泥磷的释放通量。[结果]扰动对巢湖十五里河入湖区夏季底泥磷释放的影响较大,当上覆水磷浓度为0 mg/L时,扰动时磷的释放量是静止时的2.3倍;上覆水磷浓度为0.05 mg/L时,扰动时磷的释放量是静止时的1.3倍,符合动态条件下磷释放量大于静态条件下释放量的规律。夏季十五里河入湖区底泥磷的释放通量相当大,为0.2 t/km2。因此,在外源性磷污染得到控制的条件下,控制底泥中磷的释放才是关键。[结论]该研究为今后底泥疏浚和湖泊富营养化治理提供了理论依据。

[Objective] The study aimed to estimate the release flux of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer.[Method] Under static and dynamic conditions,we analyzed the release characteristics of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer,and estimated the release flux of sediment phosphorus in the studied area in summer.[Result] Disturbance had great effects on the release of sediment phosphorus in Shiwuli River estuary of Chao Lake in summer.When phosphorus concentration in overlying water was 0 mg/L,the amount of released phosphorus under dynamic conditions was 2.3 times as much as that under static conditions;as phosphorus concentration in overlying water was 0.05 mg/L,the amount of released phosphorus under dynamic conditions was 1.3 times as much as that under static conditions.In a word,the amount of released phosphorus under dynamic conditions was higher than that under static conditions.In summer,the release flux of sediment phosphorus in Shiwuli River estuary of Chao Lake was very high,namely 0.2 t/km2.Therefore,besides controlling exogenous phosphorus pollution,we should pay more attention to the release of sediment phosphorus.[Conclusion] The research could provide theoretical references for dredging sediment and controlling lake eutrophication in future.