Investigation and analysis on the salinization degree of cultivated land in Xinjiang based on 3S technology.

After analyzing the spectral properties of saline soil,in this paper the data of spatial distribution of salinized soil in Xinjiang are extracted and analyzed using the CBERS images in the year of 2004-2005 based on the multi-hierarchical databases of environmental factors(including the resources environment background database and the land utilization database),investigated and analyzed results of field investigation in GIS,multi-factor integrated analysis and man-machine interactive interpretation.It is complicated to extract the spatial information of salinized arable land,and the multi-factor integrated analysis can be used to carry out the macroscopic investigation of salinized arable land quickly.The results are as follows:(1) With the area enlargement of arable land,the area of salinized soil is also enlarged;(2) The proportion of area of the salinized arable lands is 32.07% of the total area in the irrigated areas in Xinjiang,and the change of this proportion is not so obvious since recent 20 years based on the predecessors' statistical results and the survey in 2006;(3) Salinized arable land is distributed in the most cities and counties in Xinjiang,and its proportion is higher in south Xinjiang than that in north Xinjiang.Geomorphologically,salinized arable land is mainly distributed in the middle and lower parts of the proluvial fans,middle and lower reaches of the rivers,downfolds,etc.Soil salinization is common in the newly-reclaimed land.