Spatial variability and its genesis of surface sediments in Suhongtu Gobi
In this paper,the composition test,relative erosion rate calculation and spatial variability analysis of 0-2 cm surface and 10-20 cm underground sediments in Suhongtu Gobi are used to reveal the influence of land-scape surface differentiation and wind sand activity on grain size.The results show that the surface of the Suhong-map can be roughly divided into erosion areas(light,heavy)and accumulation areas.Under the influence of wind and hydraulic action,the residual components of suspended,creep and wind erosion increase,and salta-tion components decrease.The surface vegetation is sparse and the gravel coverage is high.Compared with the underground,the surface sediments in the accumulation area mostly show the increase of suspended and saltation components,the decrease of creep and wind erosion residual components,and the distribution of sand braided and scrub dunes,or barchan dunes and dune chains on the surface.The suspension,saltation,creep and wind erosion residual components in 0-2 cm and 10-20 cm soil layers show moderate spatial autocorrelation(25％-75％),and the nugget value is small.The variation range of each component in 0-2 cm soil layer is great-er than that in 10-20 cm soil layer,and the spatial autocorrelation range of each component is larger and the spa-tial continuity of each component is enhanced.
万方数据
维普
