Organic carbon distribution and enzyme activities of different degraded meadows soil in upstream of Heihe of Qilian Mountains.

The distribution and correlation of organic carbon and enzyme activities of meadow chestnut soil were studied in the upstream of Heihe of Qilian Mountains.The degraded degree of grassland was classified as non-degraded,light degraded,moderate degraded and heavy degraded grassland.The results showed that the organic carbon contents,densities,reserves and enzyme activities of 0~60 cm soil layer were ordered as non-degraded light degraded moderate degraded heavy degraded grassland.The organic carbon contents of 0~10 cm soil layer were 1.78,1.98,1.87 and 2.00 times higher than that of 50~60 cm soil layer in all tested grasslands.The Organic carbon contents,densities,reserves and enzyme activities of all treatments decreased with the increase of soil layer depth.There were significantly positive relationships between organic carbon content and density,enzyme activity.