Analysis on Spatial and Temporal Dynamic Variations and Their Impact Factors of Salinization Land in Hetao Plain
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Abstract:
Based on the remote sensing images of Hetao Plainin 2000 and 2006, the dynamic variation of salinization land was analyzed using the combination of remote sensing and GIS technology and statistics and spatial analysis. The results showed that the salinization land area has reduced significantly in the study area from 2000 to 2006 with an average annual decreasing rate of 5.34%. The levels of light and medium salinization land have reduced. The ratio of light salinization land to the total land decreased from 10.35% to 6.82%, and the ratio of medium salinization land to the total land decreased from 4.67% down to 1.94%. However, the heavy salinization land level has not changed significantly with the ratio varying from 5.15% to 4.96%. Soil salinization is affected by the natural environment (regional evaporation to precipitation ratio, groundwater depth, and vadose zone lithology) and human activities, , but it does not have an obvious relationship with groundwater salinity.
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