厦门坂头水库扩容对土壤氮磷浸出的模拟试验研究

Experimental Research on the Impact of Nitrogen and Phosphorus in Submerged Soil on Water Qality in Bantou Reservoir,Xiamen

水库建成蓄水后,库底大多不铺设或不全部铺设防渗衬垫层,库底土壤中氮、磷的浸出对库水水质产生一定影响。在现场调查的基础上,使用蒸馏水和水库原水组成各个不同水土组合分别进行连续性实验,分析研究了土壤中氮、磷浸出对库水中总氮、总磷浓度的影响。结果表明:总氮、总磷的浓度均发生一定程度的变化,引起变化的主要是表层土中氮、磷的浸出。从整体看,土壤氮磷的浸出量占水库水体氮磷总量比例较低,对库水水质不会产生明显的不良影响。

Most reservoirs are not paved with liner layer in the bottom. Nitrogen and phosphorus in submerged soil will be dissolved, influencing water quality when the reservoirs begin to run. In this study, on the basis of field investigation, continuous experiment was conducted with different water-soil compages which were consisted of distilled water, reservoir water and soil at the same time, and the changes of concentrations of total nitrogen and total phosphorus were analyzed, the effect for water quality was assessed. The results revealed that concentrations of total nitrogen, phosphorus changed under the experimental conditions, and the change in reservoir water was less significant than in the distilled water, and the nitrogen, phosphorus which were dissolved from surface soil were the important factors. The submerged soil will not exert significant adverse effect on water quality on the whole.