三峡库区消落带受淹土壤氮和磷释放的模拟实验

三峡库区消落带形成后，消落带土壤淹水初期将向上覆水释放氮和磷. 将消落带土壤样品进行加肥处理后与原始土壤进行模拟淹水实验.对原始土壤进行每日换水浸泡实验.结果表明:消落带进入淹水期10～15 d后，其上覆水中营养物含量趋于平衡，水体扰动对上覆水中ρ(TP)和ρ(TN)有正影响. 未经施肥处理的消落带土壤在江水浸泡下，对TP有吸附作用，使得浸泡结束后ρ(TP)下降33.4%. TN的溶出速率变化能较好地符合一级动力学方程，TP江水静态浸泡实验数据对一级动力学方程的拟合性较差；TP和TN的绝对溶出速率对一级动力学方程的相关性均较好.  

Release of N, P from Submerged Soil in the Shore-Area of Three Gorges Reservoir

After the construction of final water impoundment completes, the submerged soil in the shore area of Three Gorges Reservoir will release N andP elements into the water. Based on simulating submerging experiments with river water of origin soil sample and soil sample pretreated with nutrients, and daily water change submerging experiment of origin soil sample, it is concluded that: after the first 10～15 d of the high water level operation period of the dam,the concentration of TP and TN in the water trends to be in equilibrium, but the disturbance of the water can cause a rise of TP and TN concentration. In the simulating experiment of origin soil, the submerged soil sample had a certain ability of P absorption which declined the TP concentration by 33.4%. The results shows that the TP and TN concentration curve well conform to the first order kinetics models except the TN concentration curve of river water submerging experiment.