Choosing farmlands of different cultivated time in plain and oasis-desert ecotone in Qitai oasis

analyzes the temporal movement of soil soluble total salt

pH value

organic matter.The results show that Qitai oasis has already in a circumstance which is valuable for soil-salinization reversal evolvement

groundwater table is below 5 meters

the critical point which will affect the surface salt accumulation.Groundwater mineralization degree is lower than 3 g/L.With the decreasing of groundwater table and the increasing of cultivated time

the content of soil soluble total salt declined and organic matter enhanced

soilsalinization reversal evolvement has already occurred.Salinization reversal evolvement presents temporal and spatial characters

and can be classified as three different phases: the primary

the middle and the high-level.From the lower to the upside of Qitai oasis

the stage of soil salinization reversal evolvement gradually transfers to high-level.