Impacts of Grazing Disturbance on Soil Nitrogen Component Contents and Storages in a Leymus chinensis Meadow Steppe

Long-term grazing leads to soil degradation in Inner Mongolia grassland. Based on the Hulunbeier meadow steppe, variation characteristics of nitrogen content and storage layers between 0–40 cm, under six different intensities, response vegetation other physical chemical properties were studied. The main results as follows: (1) Moderate increased total (TN), soluble (STN) microbial biomass (MBN) contents, while heavy decreased MBN content. In year with more rain, nitrate (NO3−-N) storage, less rain ammonium (NH4+-N) (2) proportion cm components showed an upward trend opposite years rainfall increase intensity. Soil organic (SON) NO3−-N storages rainy years. (3) component contents correlated plant growth status, moisture (SM) bulk density (SBD), significantly negatively temperature (ST) pH (p < 0.05). affected by grazing, soil, vegetation, meteorological environmental factors. was conducive improvement capacity healthy development