[Study on the Relationship between Hyperspectral Polarized Information of Soil Salinization and Soil Line]

It has important significance to assess soil salinization correctly for agricultural production and ecological environment. Soil line can indicate soil salinization in a certain extent. But the soil spectral characteristics obtained at different angles will change with the changing of the soil line parameters. Base on polarized hyper-spectral reflectivity obtained in the laboratory, the study analyzes the relationship between the soil salinization and soil line parameters, explores preliminarily the best way to obtain soil line. The results show: (1) Soil spectral reflectance gradually increased slowly with increasing band. With the enhanced level of salinization, soil spectral reflectance of the first to be gradually reduced to a critical value and then gradually increased. (2) Soil salinization has a linear correlation with the soil slope and intercept. With the enhanced level of salinization, soil slope becomes smaller, and intercept becomes larger. (3) Viewing zenith angle affects the relationship between the polarization state and soil line parameters. When viewing zenith angle is fixed, there is a regularity between the polarization state and soil line parameters. When the viewing zenith angle is between 0 degrees-50 degrees, with the angle becoming larger, soil slope becomes larger, and intercept becomes smaller. (4) Polarization states affects degree of correlation between soil salinization and soil line parameters. When polarization angle is 90 degrees and viewing zenith angle is 25 degrees, the relationship model between soil salinization and soil line parameters is better. The research results can be used to evaluate the degree of salinization soil.