Composition and Sources of Dissolved Organic Matter in the Fuhe River
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).
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