库底土壤物质溶出对水库正常蓄水初期水质的影响

现场选取太湖流域老虎潭水库砂壤质竹林地、水田土壤和库区天然来水样本,进行水库正常蓄水初期模拟实验,分析研究了库水中pH值DO,CODcr,BOD,氮、磷及氟化物等组分在60 d内的动态变化及特征.实验结果表明,库底竹林地和水田地土壤在浸泡过程中会导致库水中pH值和DO的降低,CODcR,BOD5,氮,磷及氟化物等组分的含量则会增大.相对而言,竹林地土壤对水库水质的影响比水田地土壤要严重,建议对竹林地土壤采取相应处理措施.

Impacts on Water Qual ity by Nutrient Dissolving of Submerged Soil at Initial Stage of Reservoir Normal Impoundment

The submerged soil may dissolve in water and influence water quality when a reservoir begins to run. the Laohutan Reservoir in Taihu Lake basin is taken as an example. In order to study the dynamic features of reservoir water about p H, DO, COD_Cr, BOD, nitrogen, phosphorus, and fluoride within 60 days,after taking samples from bamboo soil, paddy soil, and natural water on site, a simulation experiment is carried on. Results reveal that soaking bamboo land and paddy field soil lead to the reduction of the pH and DO in water and however, the contents of COD_Cr, BOD, nit rogen, phosphorus, and fluoride are increased. Compared to the paddy soil, bamboo soil impacts reservoir water quality more seriously. This is why we recommend taking corresponding treatment measures for bamboo soil .