Data files Liang et al. Niche Differentiation of Bacterial Versus Archaeal Soil Nitrifiers Induced by Ammonium Inhibition Along a Management Gradient. Frontiers in Microbiology 1) Nitrification_potential.csv = seasonal potential nitrification rates by ammonia oxidizing bacteria (AOB) and ammonia oxidizing archaea (AOA) in ecosystems along a management gradient; See Materials and Methods and Fig. 1 for more details. Variate Description treatment ecosystems where soil samples were taken, including “Conventional”, “Biologically-based”, “Poplar”, “Early successional”, “Early successional + N”, “Deciduous forest”, and “Deciduous forest + N” rep replicated plots in the treatment Season seasons when soil samples were taken, including “Spring”, “Summer”, and “Winter” Category taxa involved in soil nitrification, including AOA and AOB Rate potential nitrification rate in mg N kg?1 day?1 2) Nitrification_kinetics.csv = nitrification rates by AOB and AOA under various ammonium (NH4+) additions in ecosystems along a management gradient; See Materials and Methods and Fig. 2 for more details. Variate Description treatment ecosystems where soil samples were taken, including “Conventional”, “Biologically-based”, “Poplar”, “Early successional”, “Early successional + N”, “Grassland”, “Deciduous forest”, and “Deciduous forest + N” rep replicated plots in the treatment Category taxa involved in soil nitrification, including AOA and AOB Ammonium measured NH4+ concentration; NH4+ additions ranged from 0.01-15 mM. Rate nitrification rate in mg N kg?1 day?1 3) amoA_abundance.csv = amoA gene abundance from AOB and AOA in ecosystems along a management gradient; See Materials and Methods and Fig. 3 for more details. Variate Description treatment ecosystems where soil samples were taken, including “Conventional”, “Biologically-based”, “Poplar”, “Early successional”, “Early successional + N”, “Deciduous forest”, and “Deciduous forest + N” rep replicated plots in the treatment Category taxa involved in soil nitrification, including AOA and AOB log_amoA log-10 transformed amoA gene abundance in g?1 dry soil 4) soil_pH = soil pH in ecosystems along a management gradient; See Materials and Methods and Fig. 3 for more details. Variate Description treatment ecosystems where soil samples were taken, including “Conventional”, “Biologically-based”, “Poplar”, “Early successional”, “Early successional + N”, “Deciduous forest”, and “Deciduous forest + N” rep replicated plots in the treatment pH soil pH