东湖沉积物和间隙水中不同形态磷的垂直分布

对武汉东湖3个样点沉积物及间隙水不同形态磷的浓度进行了测定，结果表明：(1)位于排污区附近的1号点沉积物TP浓度最大，位于湖心位置的2号点TP浓度最小；(2)3个样点沉积物中不同形态磷含量均为Fe P（铁结合态磷）所占比例最大（3885%～5914%），LP（不稳定态磷）所占比例最小（027%～149%）；(3)东湖沉积物中活性磷含量较高，有较大的磷释放潜力；(4)东湖表层沉积物间隙水中正磷酸盐和上覆水中正磷酸盐存在较大浓度梯度，浓度梯度可能不是间隙水和上覆水之间磷交换的决定性因素

VERTICAL VARIATION OF DIFFERENT FORMS OF PHOSPHORUS IN SEDIMENT AND INTERSTITIAL WATER OF LAKE DONGHU

In the present study,the vertical variation of different phosphorus forms were investigated in both sediment and interstitial water samples from three typical sites in Lake Donghu.The results showed that:(1) the highest concentration of TP was found at the most polluted site near the outfall of domestic sewerage (site I),and the lowest concentration of TP was detected at the center of Lake Donghu (siteⅡ);(2) the major and the minimal forms of TP were iron bounded phosphorus (Fe P,accounted for 3885% 5914%) and liable phosphorus (LP,accounted for 027% 149%),respectively;(3) the high concentration of mobile phosphorus was detected,and the result indicated that the sediment in Lake Donghu could become a potential sourse for phosphorus release;(4) high concentration gradient of PO3-4 between interstitial water and overlying water was detectived,but it is not the determinant factor of the exchange of phosphorus between interstitial water and overlying water of Lake Donghu