Effects of short-period grazing on soil active organic carbon fractions in Zhaosu meadow steppe

The influence of grazing on soil organic carbon content, soil readily oxidizable carbon and its distribution ratio, soil particulate component ratio, soil light fraction component ratio in Zhaosu meadow steppe were studied in grazing experiment plot with short period. The result showed that there was no significant effects of short-period grazing on soil organic carbon content although which decreased compared with CK at 0-10 cm soil layer (P0.05). The readily oxidizable carbon distribution ratio and particulate component ratio of 0-10 cm soil layer increased after grazing. There was no significant effects of different grazing intensity on soil organic carbon, readily oxidizable carbon and light fraction component ratio (P0.05). However, there were great fluctuations on the readily oxidizable carbon distribution ratio and particulate component ratio. Soil readily oxidizable carbon, readily oxidizable carbon distribution ratio, soil particulate component ratio of 10-20 cm soil layer, especially readily oxidizable carbon distribution ratio, could be used as sensitive indicators of soil organic carbon dynamics in the study region.