Water quality and growth of phytoplankton for the Yellow River estuary reservoirs-The phytoplankton growth potential in reservoirs

In this test,we used phytoplankton assay procedure to carry out determinations of phytoplankton growth potential and limiting nutrients in Gengjing reservoir.The test results revealed that,in Gengying reservoir waters,the phytoplankton growth potential of the autoclaved-filtrates and the filtrates are from 0.2 to 2.1 mg/L and from 0 to 1.0 mg/L,and in waterway waters,those of the autoclaved-filtrates and the filtrates are from 0 to 3.3 mg/L and from 0 to 2.2 mg/L.The phytoplankton growth potential of the autoclaved filtrates is approximately two times higher than those of the filtrates.When phosphorus is adjusted beyond 0.5 mg/L,the growth of the phytoplankton is especially very high.Moreover,the limiting concentration of the phosphorus for the growth of phytoplankton is in the range of 0.025 to 0.05 mg/L;the phytoplankton growth potential of the grit chamber sediment samples is higher than those of the waterway sediment.

武汉东湖的磷——浮游植物动态模型

本文报道了东湖的一个富营养化模型。这个模型按照1年的时间标度描述东湖藻类的生长和磷循环,其状态变量包括浮游植物磷、藻类生物量、正磷酸盐、碎屑磷和沉积物磷。模型校准和检验结果表明,模型对于系统给定状态的描述是令人满意的,并且对于系统的强制函数的改变能给予合理的响应。根据东湖富营养化工程治理的初步设想,利用模型进行了东湖污水截流前后的水质预报,同时考查了截流后移出沉积物或引灌江水对于改善其水质的效果。模型所提供的各种预报可供拟定东湖治理方案时参考。