The results of this study show that the Auto-DOM has obvious seasonal variation, indicating that the seasonal impact should be considered in the analysis of the contribution of Auto-DOM in the karst aquatic ecosystem. According to the analysis of the relationship between planktonic bacterial community and CDOM, combined with the analysis of microbial function, it is found that C2 may be more difficult to degrade than C1 after the mineralization of planktonic bacteria. The analysis of environmental factors and planktonic bacterial community shows that the karst aquatic ecosystem has a significant impact on the important bacteria related to photosynthesis, which helps to explain the relative stability of the Auto-DOM in the karst aquatic ecosystem, so it can be speculated that C2 may be an important RDOM in this ecology (Figure 3).
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