风力对内陆浅水水域磷水平的影响

本文通过对平度市大泽山水库(面积约0.5平方公里,平均水深约1.5米)的实地观测,研究了风力对内陆浅水水域磷水平的影响。结果表明,影响程度取决于风速、风力作用时间、水深以及风力作用前磷水平的高低等因素。就大泽山水库而言,风速大于2.5米/秒的风力可引起各种形态磷的明显增加。不过对磷酸盐磷来说,如果浓度本来就较高,风力作用下当有大量沉积物颗粒泛起时,会对PO_4~≡产生吸附,因而可能导致水中游离磷酸盐磷含量下降。鉴于此,作者建议对内陆浅水水域进行磷水平调查时应考虑风力的作用。

THE EFFECT OF WIND ON THE LEVEL OF PHOSPHORUS IN SHALLOW INLAND WATERS

This investigation was carried out in Dazeshan Reservoir at Pingdu City The water area of the reservoir was about 0.5km~2, and the mean depth,was 1.5m. The results indicated that the effect of wind on the level of phosphorus in shallow inland waters is determined by the wind speed, the duration of wind blowing, the depth of the water, and the original P-level before wind blowing. In this reservoir, wind with speed over 2.5m/s would cause obvious increases in the concentrations of all forms of phosphorus. However because of adsorption by suspended sediment, the concentration of PO_4-P might decrease when its original concentration in the water was relatively high. In view of this the authors suggested that in investigation of P-level of shallow inland waters, the effect of wind should be taken into account.