Fluorescence characteristics of DOM in Dongping Lake and its correlation with hydrogen and oxygen stable isotopes

The combined EEMs-PARAFAC model and hydrogen and oxygen stable isotopes were applied to characterize the fluorescence characteristics and sources of DOM, the distribution of hydrogen and oxygen stable isotopes, and deuterium surplus. Four fluorescence components were identified in DOM, and the tyrosine-like component 1 dominated the DOM pool. The DOM was affected by autochthonous, exogenous and atmospheric precipitation at the same time, but mainly by autochthonous input. The proportion of atmospheric precipitation recharge was larger than that of Dawen River. The dissolved organic carbon input in atmospheric precipitation might have an important effect on the DOM in Dongping Lake, which need further systematic study. Hydrogen and oxygen stable isotopes were found to be significant correlated to dissolved organic carbon and humic-like fluorescence, which could indicate the changing trend of DOM to a certain extent. © 2020, Editorial Board of China Environmental Science. All right reserved.