Soil environment factors and plant properties
The soil abiotic parameters and plant attributes significantly differed by treatment (Table 2). N addition significantly reduced soil pH but had no effect on soil temperature and humidity. In contrast, N input significantly increased available N concentrations in soil and aboveground and belowground biomass. Increased precipitation significantly increased soil moisture and aboveground biomass. Precipitation reduction significantly reduced soil moisture and soil NH4+-N. However, soil pH, NO3-N, and belowground biomass were not affected by precipitation changes. Except for soil temperature, the combination of N addition and precipitation changes did not affect other environmental factors.