关键词: 土壤有机碳, 梭梭, 沙质荒漠, 草地, 准噶尔盆地, 影响因素

Abstract: In order to investigate the effects of environment factors on content of soil organic carbon in Haloxylon desert plots,  the contents of soil organic carbon in 0—100 cm soil layer of Haloxylon sandy land in Junggar Basin were measured through route survey and typical plot layout. The spatial distribution characteristics and influencing factors of soil organic carbon were analyzed. The results showed that the contents of soil organic carbon were ranged from 0.00 to 11.46 g·kg-1 in 0—100 cm soil layers with moderate variation level, and showed a decreasing trend with the increase of soil depth. The soil organic carbon content of Haloxylon ammodendron desert was 1.40 times higher than that of Haloxylon persicum desert, which indicated that Haloxylon ammodendron desert had stronger capacity of carbon sequestration. The results of redundancy analysis showed that soil pH, vegetation coverage and soil water content were the main influencing factors of soil organic carbon spatial variation, which provided theoretical basis for the restoration, management and sustainable utilization of the degraded Haloxylon persicum desert.

Key words: soil organic carbon, Haloxylon, sandy desert, grassland, Junggar Basin, influencing factors