水库淹没土壤中磷浸出的模拟实验研究

Simulative Experimental Research on Extraction of Phosphorous in Submerged Soil in Reservoir

水库建成蓄水后,库底土壤中磷的浸出会对库水水质产生一定影响。以南水北调中线工程的调蓄水库——瀑河水库为例,在现场调查基础上,使用蒸馏水和不同组分的3种模拟水分别进行模拟实验,考察库水中总磷与钙离子浓度对土壤中磷浸出的影响。实验结果表明,蒸馏水与模拟水中总磷浓度均发生一定程度的变化,模拟水中的浓度变化比蒸馏水中的变化复杂;模拟水中总磷或钙离子浓度较高时,土壤中磷的浸出量较少,对库水水质未产生明显不良影响。

Phosphorous in submerged soil will dissolve in water and influence water quality when the reservoir begin to run.In this study, the Baohe (Bao River) Reservoir with the functions of adjusting and storing water at the mid-route of South-to-North Water Transfer Project is taken as an example. On the basis of field investigation, simulative experiment is conducted with distilled water and different simulative waters at the same time. The results revealed that concentration of total phosphorus has changed under the experimental conditions, and change in distilled water is less than in simulative water.When there is a high concentration of total phosphorus and Ca^(2+) in simulative water,the extract of phosphorous in soil is little.The submerged soil will not exert significant adverse effect on water quality on the whole.