用生氧量生物测验法对 4口缓冲物质含量不同的氯化物水型 (ClⅡNa)盐碱池塘水的缓冲能力进行研究。结果表明 ,浮游植物的光合作用 (净产氧量 )与池水 pH升高密切相关。这类盐碱池塘 pH较高的原因是总CO2 或Ca2 + 含量相对较低所致 ,向池水中添加相对缺乏的缓冲物质可大幅度地减小光合作用引起的 pH的上升。当池水中总CO2 含量相对不足时 ,通入CO2 比加入含HCO3- 的缓冲溶液能更有效地提高其缓冲能力。文中拟合了不同缓冲剂含量的池塘水中由于光合作用所引起的OH- 增量与总CO2 和Ca2 + 浓度之间的回归模型。还探讨了池塘水的 pH与总CO2 、Ca2 + 浓度和浮游植物密度的相互关系 ,并拟合出了它们之间的回归模型 The bioaccumulation test was used to study the buffering capacity of four chloride water (ClⅡNa) saline ponds with different buffer contents. The results showed that the photosynthesis of phytoplankton (net oxygen production) is closely related to the increase of pH of drinking water. The reason for the higher pH of such saline-alkali ponds is due to the relatively lower total CO2 or Ca2 + content. The addition of a relatively scarce buffer to the pond water greatly reduces the photosynthetic pH-induced increase. When the total amount of CO2 in the pond water is relatively insufficient, CO2 can be more effectively enhanced than the buffer solution added with HCO3-. In this paper, the regression model between OH- increment and total CO2 and Ca2 + concentrations in pond water with different buffer contents was fitted. The correlation between pond water pH and total CO2, Ca2 + concentration and phytoplankton density was also explored and the regression model was fitted