Data for soil microbial activity under precipitation

Soil extracellular enzymatic catalysis is the rate-limiting step in soil organic matter decomposition, and Vmax and Km are enzyme kinetic parameters reflecting enzyme catalytic capacity. However, it is still far from clear how these enzymatic kinetic parameters respond to altered precipitation and subsequently influence soil microbial respiration (Rh). Here, we examined the Vmax and Km of seven soil hydrolytic enzymes and polyphenol oxidase (PPO), Rh, and microbial biomass carbon (MBC) under altered precipitation (-30%, ambient, and +30%) across three steppes.