Fan C X, Zhang L, Qu W C
Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
J Environ Sci (China). 2001 Oct;13(4):406-10.
Intact sediment cores and wet/dried surficial sediments sampled from the two sublakes in Taihu Lake, Meiliang Bay and Wuli Lake, were incubated in the laboratory to determine the effects of resuspension on internal phosphorus loading by simulating different resuspension events. Soluble reactive phosphorus (SRP) release from undisturbed core sediment sampled in the Meiliang Bay and Wuli Lake in July 1998 was 1.53 mg/m2 and 2.24 mg/m2 within 4 days, respectively. However during one hour experimental simulation of resuspension, SRP increased by 0.041 mg/L and 0.077 mg/L in the above cores, which indicate that a typical resuspension event in the lake would be accompanied by the release of 10.77 mgSRP/m2 and 23.1 mgSRP/m2, respectively. The internal phosphorus loading induced by resuspension is estimated to be 8-10 times greater than the release from undisturbed sediment. SRP release from the dried sediments during simulation of resuspension was mainly dependent on the disturbing intensity. Only when the wind strength gets to certain level, the influence of wind speed on phosphorus release appears significant, indicating that an exchangeable P pool, capable of altering equilibrium conditions in the lake areas, is built up under strongly wind-exposed resuspension events.
从太湖梅梁湾和五里湖两个子湖采集完整的沉积物岩芯以及湿/干表层沉积物，在实验室进行培养，通过模拟不同的再悬浮事件来确定再悬浮对湖泊内部磷负荷的影响。1998年7月从梅梁湾和五里湖采集的未扰动岩芯沉积物中，可溶性活性磷（SRP）在4天内的释放量分别为1.53mg/m²和2.24mg/m²。然而，在1小时的再悬浮实验模拟中，上述岩芯中的SRP分别增加了0.041mg/L和0.077mg/L，这表明湖泊中典型的再悬浮事件将分别伴随着10.77mg SRP/m²和23.1mg SRP/m²的释放。据估计，再悬浮引起的湖泊内部磷负荷比未扰动沉积物的释放量高8 - 10倍。再悬浮模拟过程中干沉积物的SRP释放主要取决于扰动强度。只有当风速达到一定水平时，风速对磷释放的影响才会显著，这表明在强风作用下的再悬浮事件中会形成一个能够改变湖区平衡条件的可交换磷库。
