府河溶解有机质组成及来源探究

Composition and Sources of Dissolved Organic Matter in the Fuhe River

采用三维荧光光谱与平行因子分析方法解析府河水体中的溶解有机质(DOM)的组分,开展DOM组分占比与人为排放情况、浮游植物细胞密度动态关系研究。结果显示,府河水样DOM中共鉴定出4种荧光组分,其中两种类腐殖质(C1和C2)组分和一种类蛋白质(C4)组分主要源于人为排放,一种类富里酸(C3)组分主要源于人为排放和自然源输入。通过回归分析发现,浮游植物生物量与C1、C2、C3的占比呈显著负相关(P<0.05),与C4的占比呈显著正相关(P<0.05),表明浮游植物的生长繁殖会增加水体中的类蛋白质的含量。冗余分析(RDA)结果进一步表明,类富里酸对微囊藻(蓝藻)和异极藻(硅藻)的增殖有积极影响,类蛋白质对囊裸藻(裸藻)和小球藻(绿藻)的增殖有促进作用。

Three-dimensional fluorescence spectroscopy and parallel factor analysis were used to analyze the components of dissolved organic matter(DOM)in the water of Fuhe River,and the dynamic relationship between DOM components,anthropogenic emissions and phytoplankton cell density was studied.The results showed that the model produces two humic-like species(C1 and C2),one fulvic-like acid(C3)and a protein-like(C4)component,in which C1,C2 and C4 were mainly derived from anthropogenic emissions,and C3 was derived from anthropogenic emissions and natural inputs.The regression analysis found that phytoplankton biomass was negatively correlated with the proportion of fluorescence components C1,C2 and C3(P<0.05),and positively correlated with the proportion of C4(P<0.05).The results of redundancy analysis(RDA)further indicated that the retinoids had a positive effect on Microcystis(Cyanophyta)and Gomphonema(Bacillariophyta),while the proteinoids had a promoting effect on Trachelomonas(Englenophyta)and Chlorella vulgaris(Chlorophyta).