Effect of grazing in spring and autumn on the physical and chemical properties of soil in Qilian Mountain

In order to investigate the effects of spring and autumn grazing on soil physical and chemical properties in Kansu wapiti(Cervus elaphus kansuensis), six grazing intensity plots were set up in this study, and the physical and chemical properties of 0–40 cm soil layer were analyzed. The results showed that 1) the soil bulk density of 0–40 cm soil layer increased with the increase of grazing intensity, especially to the surface soil (P < 0.01); 2) 0–40 cm soil moisture and soil organic carbon density Soil total nitrogen density and total amount, soil available phosphorus density and total salt content generally decreased with grazing enhancement, and soil moisture, total nitrogen, available phosphorus density and total salt content were significantly negatively correlated with grazing intensity(P < 0.01), soil organic carbon density was significantly negatively correlated with grazing intensity (P < 0.05), 0–40 cm soil layer plant root carbon accounted for total soil The proportion of organic carbon increased gradually with the increase of grazing rate, and it was positively correlated with grazing rate (P < 0.05). The density of total nitrogen in 10–20 cm soil layer was the largest, and the ratio of soil available nitrogen to total nitrogen increased with grazing. The total C/N ratio of soil layer and soil in 0–40 cm decreased with the increase of grazing rate. The research results can provide a scientific basis for revealing the interaction mechanism and sustainable management of grassland and livestock in the Qilian Mountains.