Dissolved organic carbon (DOC) is one of the most abundant fractions of organic matter in aquatic systems and plays an important role in the dynamics of aquatic environments [1]. 90-95% of organic carbon in lakes is present in the dissolved form [2], it can be used to monitor carbon storage in the water environment [3][4][5]. DOC in inland water has various terrigenous sources, and its circulation leads to the mixing of biological, physical and photochemical processes [6]. In general, dissolved organic components in water are products of the decomposition of living or dead aquatic organisms, such as large plants and algae [7]. A large amount