武汉东湖底泥释磷特点

为了探讨东湖底泥的释磷状况 ,采用实验室模拟法研究了环境条件变化对东湖底泥沉积物磷释放的影响以及底泥磷的形态分布与底泥释磷量的关系 .结果表明 :升高水温和扰动上覆水均能加速磷释放 .上覆水中性时(pH =7.4) ,底泥释磷量最低 ;在较高或较低 pH值时 ,底泥释磷量倍增 .厌氧条件下底泥释磷量是好氧条件下的30倍 .研究还显示 ,底泥中不同形态的磷与底泥磷释放量有不同程度的相关性 ,其中可溶性磷和铁磷与底泥磷释放量高度相关 (r>0 90 ,P<0.01) .

Release Character of Phosphorus from the Sediments of East Lake,Wuhan

Effects of environmental factors on the release of phosphorus were studied at laboratory simulated test.The relationship between the different forms of phosphorus in sediments and the quantity of releasing phosphorus was studied at the same time.Results showed that the rates of phosphorus release from the sediment increased with rising the temperature of disturbing the overlying water.The content of phosphorus release from the sediment reached the lowest level when pH value was 7.4,high pH or low pH increased the rates of phosphorus release from the sediment.In anaerobic,the release rates of phosphorus was 30 times as much as in aerobic.Research also showed that different chemical forms of phosphorus in sediments were related to the quantity of phosphorus released from the sediments in varying degrees.The dissolved phosphorus and Fe binding phosphorus in sediments played the most important roles (r>0.90,P<0.01).