Genesis properties and taxonomic classification in different types of topography and under different degrees of vegetation coverage are studied through the investigation of a 2 500 hm2 unused land and the analysis of soil samples at different depths in the Bandengtan resettlement area of Dingbian County

Shaanxi Province.In the study area

soil genesis layers are not complete

and profile differences in soil color

soil structure

and soil nutrients are not distinct.Soil organic matter content is rather low

with a maximum content of 1.787 1 g/kg and a minimum content of 0.201 7 g/kg.There are no distinct eluviation and deposition of soil calcium carbonate and no distinct deposition layer in the profile.Sand(2~0.02 mm) is the main particle composition.The CEC concentrates at 2.5~5 cmol/kg

indicating a poor soil fertility.From the diagnostic horizons and their characteristics analysis

soils in the area belongs to 1 soil order

1 suborder

2 groups

and 4 subgroups

in which Ⅱ1 belongs to Parasalic Aqui-Sandic Primosols;Ⅱ5

Sodic Aqui-Sandic Primosols;Ⅲ4

Calcaric Aqui-Sandic Primosols;and Ⅵ4

Calcaric Usti-Sandic Primosols.The results can be used as a reference to comprehensive soil resources evaluation

soil suitability evaluation

and the rational layout of agriculture

forestry

and animal husbandry.