Composition,distribution and source analysis of dissolved organic matter(DOM)in Tuojiang River(Chengdu Section)water body in winter
Based on UV-VIS absorption spectrum,parallel factor model(EMS-PARAFAC)and principal component analysis(PCA),the composition characteristics and sources of dissolved organic matter(DOM)in the Chengdu section of Tuojiang River Basin in winter were investigated.The results showed that three fluorescence components were identified in the water body of Chengdu section of the Tuojiang River Basin in winter,namely,UVA humus C1 with higher molecular weight,tyrosine-like component C2 in endogenous proteins and C3 in aromatic amino acid humus with larger molecular weight.A-mong them,C2 was mainly exogenous input,while C2 and C3 were mainly mixed input from endogenous sources.The three components accounted for 22.9％,51.3％and 25.8％of the total fluorescence intensity,respectively.Through comparative analysis of DOC,SUVA254 and SR in the water body,it was found that the overall DOM humification degree and DOM molec-ular weight in the study area were in the lower reaches＞middle reaches＞upper reaches.Principal component analysis(PCA)was used to determine the source of DOM in the water body in the study area,and the contribution rate of endogenous input was 77.64％,the contribution rate of exogenous input was 10.13％,and the contribution rate of cumulative variance was 87.77％.Based on the above analysis results,it can reflect the water quality of Chengdu section of Tuojiang River Basin in winter to a certain extent.
chengdu section of Tuojiang River Basinthree-dimensional fluorescencedissolved organic matterparallel factor analysisprincipal component analysis
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