[Water Quality and Diversity of Denitrifier Community Structure of Typical Scenic Water Bodies in Xi'an].

Six micro-polluted landscape water bodies were selected to explore the relationship between water quality and the -Type denitrifier community structure and diversity with an Illumina high-throughput sequencing technique. The results of a physico-chemical analysis of the water bodies showed that the Fengqing Park (FQ) and Laodong Park (LD) water bodies were classified as inferior Ⅴ water quality, the Qujiang Park (QJ), Mutasi Park (MTS), and Xinjiyuan Park (XJY) water bodies were classified as Ⅴ water quality, and the Yongyang Park (YY) water quality was classified as Ⅳ. The TN values varied from 1.21 mg·L to 6.50 mg·L, with the lowest value found in YY and the highest in FQ (<0.05). TP was significantly higher in LD (0.10 mg·L) and significantly lower in QJ[0.02 mg·L (<0.05)]. The NH-N in LD was 4.44 times higher than that in QJ and FQ (<0.01). Illumina high-throughput sequencing revealed that the denitrifier community composition was significantly different among the six water bodies, and sp., sp., and sp. were the dominant genus species. A principle component analysis (PCA) indicated that the -Type denitrifier communities of XJY and MTS were mainly regulated by NH-N and the permanganate index, LD and FQ were significantly influenced by NO-N, NO-N, TN, TP, and DO, and YY was significantly influenced by pH value. Our results showed that -Type denitrifier communities were regulated by different water quality indicators.