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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，进而导致水体中ｐＨ升高
Through analyzing and revealing that the main area with high pH value in the Luanhe River is located in Yuqiao Reservoir, the influences of the rock in the Luanhe River basin, the influence of the soil on the solute in the groundwater, the groundwater transport and the photosynthesis of phytoplankton in the water body pH and other factors to find the reasons. The study determined that algae photosynthesis in water is the main reason for the increase of pH. Higher nitrogen and phosphorus in water cause large numbers of algae to multiply, whereas algae absorb carbon dioxide and release oxygen during photosynthesis, thereby affecting the balance of HCO-3, CO2 and OH- in water, leading to an increase in pH in water