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HFCW achieved the average removal rate of TN at 76.01%, and the average removal rate of TN by VFCW reached 71.69% after the carbon addition. In contrast, dosage of an external carbon source showed limited effect on phosphorus removal. Furthermore, it worked more effectively for performance improvement of HFCW than that of VFCW. ③The analysis of microbial community structure in wetland substrate and plant rhizosphere samples revealed that Proteobacteria, Firmicutes, and Verrucomicrobia were the dominant phylum in two series of wetland sa