Key Laboratory of Northwest Water Resource;
Environment and Ecology;
MOE;
Xi’an University of Architecture and Technology;
Xi’an 710055;
China;
Shaanxi Key Laboratory of Environmental Engineering;
School of Environmental and Municipal Engineering;
Xi’an University of Architecture and Technology;
Xi’an 710055;
China;
Drinking water reservoirs; Aerobic water layers; Denitrifying bacterial community; NirS gene; Co-occurrence network model;