【摘要】 放牧对草地生态系统的影响是多方面的，在短花针茅荒漠草原上，放牧改变了土壤贮氮的季节动态、垂直分布及氮的矿化速率，使全氮贮量下降，季节波动幅度变大，尤其是0～20cm土层更明显；水解氮贮量10～30cm土层明显下降；同时放牧使氮的矿化速率明显提高。更多还原

【Abstract】 Effects of grazing on the grassland ecosystems had many ways. On the stipa breviflora desert steppe, grating changed the seasonal dynamics of the soil reserve nitrogen, Vertical distribution and rate of nitrogen mineralization, and made the total nitrogen storage capacity decrease and range of seasonal fluetuation increase, especially was 0~20cm soil layer more obvious; The hydrolytic nitrogen storage capacity decreased obviously; Meanwhile,grazing made rate of nitrogen mineralization increase obviously.更多还原