江阴地区主要内河叶绿素a动态特征及其与环境因子的相关分析

Dynamic Characteristics and Correlative Analysis to its Environmental Factors of Chlorophyll-a in Main Rivers of Jiangyin City

根据江阴市4条主要内河锡澄运河、白屈港河、张家港河及横河的监测数据,分析叶绿素a(Chla)的动态变化及其与理化水质因子的相关关系,并建立逐步回归多元线性模型,筛选与Chla显著相关的水质因子。结果表明,4条河道Chla存在明显的时间变化和空间分异。不同河道对Chla有显著影响的水质因子各不相同。总体来说,锡澄运河、白屈港河及张家港河Chla的主要影响因子为水温和外源输入,而横河除了这两个因子外,还受P和NH-N影响。

According to the monitoring data in Xicheng canal, Baiqugang river, Zhangjiagang river and Heng river of Jiangyin city, the relationship between chlorophyll a （ Chl. a） concentrations and physio - chemical factors was investigated. Besides, the factors that are significantly correlated with Chl. a using the methods of multiple linear stepwise regressions were selected. The results indicated that there was an obvious temporal and spatial variation of Chl. a. Correlation analysis showed that the significantly important environmental factors which affect Chl. a were not always the same in four investigated rivers. In general, the main environmental factors affecting Chl. a were water temperature and exogenous inputs for the first three rivers, plus phosphorus and ammonia for Heng river.