引滦河道中水质偏碱的起因研究

Study on the Causes of Water Bias Alkalinity in Luanhe River Channel

通过分析揭示引滦河道ｐＨ值偏高的主要区域在于桥水库内，并分别从引滦河道流域内的岩石、土壤对地面水中溶质的影响、地下水运移及地面水中浮游植物的光合作用对水体ｐＨ值的影响等几方面寻找原因。经研究确定水体中藻类的光合作用是ｐＨ升高的主要原因。水中较高的氮、磷使藻类大量繁殖，而藻类在光合作用过程中，吸收二氧化碳，放出氧气，从而影响水中ＨＣＯ－３，ＣＯ２和ＯＨ－的平衡。

Through analyzing water quality change trend in Luanhe River Channel since the construction completion,the main area with high pH value was found among Yuqiao Reservoir.The causes of effecting the pH value increment were discussed from various aspects,e.g. the rock weathering and soil action influencing the solute in the surface water,the groundwater moving,and the phytoplankton photosynthesis.It was determined that photosynthesis of algae is the principal reason of the pH value increment.High concentration of nitrogen and phosphorus in the reservoir results in algae bloom.Algae absorb CO 2 and release O 2,breaking out the balance between HCO - 3,CO 2 and OH - and bringing about the pH value increment in the reservoir.