湖泊富营养化因子对叶绿素a影响的SEM分析

Influences of Lake Eutrophication Factors on Chlorophyll a Using Structural Equation Model

根据湖泊富营养化成因机理,采用结构方程模型(SEM),引入物理环境、有机物、营养盐和浮游植物4个潜变量,并结合选取的5个影响因子,建立了富营养化结构方程模型,以便模拟各因子对巢湖流域南淝河入巢湖口水体中叶绿素a的影响。结果表明,该模型揭示了富营养化各要素与叶绿素a之间的复杂关系,与其他方法相结合可直接预测叶绿素a的浓度。

Taking Chaohu Lake basin for an example,this paper analyzes the influences of eutrophication factors on chlorophyll a by using structural equation model（SEM）.According to the mechanism of lake eutrophication,four intrinsic variables including physical factors,nutrients,organism and phytoplankton are introduced in this model.Along with five eutrophication factors,the SEM-based eutrophication model is established.The results show that the SEM-based model demonstrates the relationship between eutrophication factors and chlorophyll a,and it can directly predict the concentration of chlorophyll a with combination of other methods.