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.