Response Analysis Of Multi-polarization Radar On Freeze-thaw Period Soil Salt In Inner Mongolia Hetao Irrigation District

Soil salinization is affected by drought, cold, an important factor in irrigated agricultural production, soil salinization to the socio-economic and agro-ecological serious repercussions, attracted more and more attention from researchers, the use of all-weather, all-time remote sensing data with the dynamic changes of great significance and degree of salinization of soil salinization monitoring and management.In this paper, the research Hetao irrigated area, considering the moisture content of the soil, freezing changes and other factors, in order to freeze and dissolution of the irrigation area for the study period, analysis of Radarsat-2radar image data on the extent of soil salinization, different polarization combination of image sensitivity of salinization of the soil. Extract the most beneficial freeze period and dissolution irrigated soil salinization monitoring, remote sensing research on improving the monitoring of water and salt, to develop and manage Irrigation Irrigation systems have important theoretical and guidance.The results showed that:(1) in the study area to select the image enhancement Lee filter for image denoising to Google Maps to correct the image of the radar image correction, precision control in less than one pixel;(2) different polarization ways to respond to different levels of soil salinization different VV polarization in the dissolution of various degrees of soil salinization strongest response; VV polarization image of the freeze on non-saline soil, mild salted the most intense response of soil and moderate soil salinization, HH polarization severe soil salinization of the strongest response;(3) a combination of the dissolution of polarization(VH2+VV2)/(VH2-VV2)can be good soil salinization extract information; freeze period (HV2+VV2)/(HV2-VV2)polarization combinations can extract good soil salinization information;(4) by comparing the choice of a neural network model model of the study area;(5) dissolved period(VH2+VV2)/(VH2-VV2)polarimetric radar images and sort of correlation of various ions HCO3-, Mg2+, Cl-, SO42-, Ca2+, K++Na+, CO32+; freeze (HV2+VV2)/(HV2-VV2) polarimetric radar images and various ion correlation sort of HCO3-, Cl-, Mg2+, SO42-, Ca2+, K++Na+, CO32-.