Changes of Soil Organic Carbon Content under Different Vegetation Types

Taking the Kashgar city different vegetation types(shrub,forest,grass land and bare land) as the research objects,the organic carbon contents and the organic carbon density of the soil in the soil profile at 0 ~20 cm depth were analyzed.The research results showed that the average organic carbon contents and the average organic carbon density of the soil in the soil profile at 0~20 cm depth were grass land(10.130 810 g / kg,3.021 713 kg / m2) shrub(8.775 414 g / kg,2.590 197 kg / m2)forest(7.853 428 g / kg,2.383 278 kg / m2)bare land(6.364 066 g / kg,1.925 676 kg / m2). The distributions in soil profiles of the organic carbon contents and the organic carbon density under each vegetation type were similar but differed in amplitude of variation. Vegetation construction on city would contribute to soil carbon sequestration and the grass land and shrub communities had better effects. Strong human disturbance should be reduced or avoided to prevent the change of carbon in shallow soil layers and to keep the stability of the soil carbon pool.