黄岐半岛海域赤潮高发区水环境因子与叶绿素a的通径分析

Path Analysis of Water Environmental Factors and Chl-a in Red Tide Area of Huangqi Peninsula

2016年对黄岐半岛海域赤潮高发区进行了水环境调查,获取了水温、盐度、pH、溶解氧、化学耗氧量和营养盐等水质因子调查数据,利用多元线性回归方法对叶绿素a的各影响因子进行回归分析,并用通径分析原理分析各水质因子对叶绿素a的影响程度。结果表明:对叶绿素a产生影响的水质因子有水温、盐度、pH、溶解氧、化学需氧量、活性磷酸盐和亚硝酸盐-氮。通径系数分别为-0.546、-0.888、1.134、1.428、-0.335、-0.775和-1.300。其中溶解氧对叶绿素a正向影响最大,而亚硝酸盐对叶绿素a负向影响最大。

In 2016,a water environment survey was conducted in the red tide area of the Huangqi Peninsula.The survey data of water temperature,salinity,pH,DO,COD and nutrient salt were obtained.Multiple linear regression method was used to analyze the influencing factors of the Chl-a.The influence of the water factors on the Chl-a was also analyzed based on the path analysis principle.The results showed that the Chl-a was affected by the water temperature,salinity,pH,DO,COD,PO4-P and NO2-N.The path coefficients of these factors were-0.546,-0.888,1.134,1.428,-0.335,-0.775,-1.300,respectively.DO affected the Chl-a with the greatest positive effect,while NO2-N had the greatest negative effect on the Chl-a.