Abstract: 【Objective】The characteristics of soil salt ions in soil profile were investigated under different vegetation types, and the purpose was to provide a theoretical basis for excavate and sustainable use of salinization soil.【Method】The object of study was orchard salinization soils in Qin’an County of Gansu Province. A field experiment was carried out to probe into the effects of vegetation type (barley, maize, apple fruit trees and the bare land) on soil salt and ions.【Result】The results showed that in semiarid salinization area, salt in soil profile of the bare land always was in a state of accumulation, the intensity and depth of salt accumulation was gradually increased with time elapsing. Salt accumulation was restrained in soil profile in barley and maize planting land at the late growth stage. However, there were two peak values on salt accumulation in soil profile in fruit trees planting land. The first peak value was from May to June, salt mainly accumulated in the soil layers of 10-30 cm. The second peak value was in middle August, salt mostly accumulated in the soil layers of 30-50 cm. 【Conclusion】Under the condition of agro-forest vegetation in semiarid, vegetation types affected the periods of salt ions accumulation, the intensity of salt ions accumulation, and the place of salt ions accumulation. There was a significant influence of planting barley, maize and apple fruit trees on the content of salt, Cl- and water soluable Ca2+ in soil profile.

Key words: vegetation types, salt and ions, transfer, accumulating