Sequences of bacteira
High-throughput sequencing samples were collected on September 18, 2019, and stored at 80 C in a cryogenic refrigerator before testing . The samples were taken from 20 cm below the surface and 40 cm from the outlet pipes in CP, H2, H3, and H4. DNA was extracted using Fast DNA SPIN Extraction Kits (MPB Biomedicals, Santa Ana, CA, USA). Concurrently, a UV-VIS (NanoDrop One, Thermo Fisher, USA) was used for the quantitative measurement of DNA, and DNA extraction quality was detected by 1.3% agarose gel electrophoresis.