Study On The Remote Sensing Monitoring And The Inducing Factors Of Soil Salinization In The Houtao Plain

The Houtao plain,as an irrigated area in the Inner Mongolia,but because of the geological,geographical climatic conditions and human activities,the plain has become one of the most serious salinized regions in China.Remote sensing technology is widely used in land resources survey with the rapid and temporal characteristics.The key of remote sensing survey on salinization is the appropriate and effective means to extract the saline-alkali soil.This article sets the 5 remote sensing images which include MSS in 1973,TM in1987,1995,2006 and ETM+in 2015 as the data source.Based on image correction and enhancement,choose the IsoData method,maximum likelihood classifier and ANNS to get a detailed saline-alkali soil classification.Based on the systematic statistics for the distribution of saline soil,which combined with the regional geology,climate and human activities background factors,the main factor were discussed.The research shows that:the ANNS has a good output for land salinization classification in arid area,the salinization in 1973 to 2006 was reduced and increased in the proportion of 14.61%as 78530 hm² last ten years.And the silt sediments land is more seriously;the regions where the low Rb-Sr ratio as 0.3⁰.4,high weathering-leaching coefficient values?2.0².5?in deep soil,the low molybdenum content on 0.3×10^-60.5×10^-6 in topsoil or the high chloride ions content in groundwater have the higher probability of salinization;the degree of salinization is positively correlated with the relative humidity of the same year and negatively correlated with the total precipitation of the last year;the human activity increased salinization in the study area at the same time.The salinization affects agricultural production and land use,and has become one of the most important factors that limit local development.The paper monitoring the Houtao plain salinization on spatial and temporal distribution and its influencing factors in recent 40 years,and it provide a scientific basis for the area development and salinization prevention.