沉积物粒径对磷营养盐释放的影响试验

Experiment on effect of sediment particle size on the release of phosphorus nutrients

为探究环境因子对湖泊沉积物营养盐释放的影响规律,以雁鸣湖为研究对象,通过室内试验探讨了5种粒径(0.08、0.15、0.30、0.425和1.00 mm)沉积物对磷营养盐释放的影响。结果表明,5种形态磷含量变化均随沉积物粒径的增大而增多;不同沉积物粒径条件下,同一种形态磷含量达到释放平稳所需的时间相同;而各形态磷之间呈现不同的释放规律,达到释放平稳所需的时间也不同;曲线拟合得出总磷(TP)、溶解性总磷(DTP)、溶解性活性磷(SRP)和颗粒态磷(PP)含量与沉积物粒径的最优拟合函数均为对数函数,溶解性有机磷(DOP)含量与沉积物粒径的最优拟合函数为线性函数。

There are various factors that lead to lake eutrophication.Taking Yanming Lake as the research object,this paper discusses the effect of five different sediment particle sizes(0.08,0.15,0.30,0.425 and 1.00 mm)on phosphorus nutrients through laboratory tests and the influence of sediment on the release of phosphorus nutrients.The test results show that the changes of the five forms of phosphorus increases with the increase of particle size of sediment.Under different sediment particle size,the time required for the same form of phosphorus to reach a stable release is the same.However,different forms of phosphorus show different release laws,and the time required to achieve a stable release is also different.The curve fitting shows that the optimal fitting functions of total phosphorus(TP),dissolved total phosphorus(DTP),dissolved active phosphorus(SRP)and particulate phosphorus(PP)content and sediment particle size are all logarithmic function.The best fit function of dissolved organic phosphorus(DOP)content and sediment particle size is a linear function.