中文摘要：

利用高分辨率的薄膜扩散梯度技术（Diffusive Gradients in Thin Films,DGT）和微电极技术,从微界面的角度研究了摇蚊扰动对沉积物中溶解氧（DO）、活性磷（Labile P）、活性铁（Labile Fe）及Labile P扩散通量的影响。研究发现摇蚊幼虫扰动增加了沉积物中溶解氧的渗透深度,降低了Labile P和Labile Fe的浓度,同时抑制了Labile P向上覆水中的释放。由于Labile P与Labile Fe显著相关（对照组R=0.672,P〈0.001;摇蚊组R=0.810,P〈0.001）,可知Labile P的变化受DO和Labile Fe控制,即Labile Fe被氧化生成三价Fe（OOH）,同时吸附Labile P,使得Labile P和Labile Fe同时降低。

英文摘要：

The effects of chironomid larvae bioturbation on the concentrations of dissolved oxygen（ DO）,labile phosphorus（ Labile P）,and labile iron（ Labile Fe）,as well as the diffusion flux of Labile P across the sedimentwater interface in eutrophic lakes were examined using high-resolution diffusive gradients in thin films（ DGT） and microelectrode techniques. The results show that chironomid larvae bioturbation increases the depth of penetration of DO in the sediments,decreases the concentrations of Labile P and Labile Fe,and inhibits the release of Labile P from sediments to the overlying water. Because Labile P is significantly correlated with Labile Fe（ R = 0. 672 and P〈0. 001 for the control group,and R = 0. 810 and P〈0. 001 for the chironomid group）,it can be inferred that the change of Labile P is controlled by DO and Labile Fe according to the following process： Labile Fe is oxidized to produce the ferric hydration Fe（ OOH）,which can adsorb Labile P,and this leads to the decrease of the Labile Fe and Labile P concentrations.