Research on Spectral Characteristics of Typical Soil in North Xinjiang

The authors analyzed indoor spectrum of the typical soil in Manasi river alluvial plain,Xinjiang.Changes of spectral reflectance in soil under the different condition of texture,water and salt content were studied.The results showed that: Spectral reflectance of different texture soil was as follows: Clay silty-clay-loam sandy loam;soil spectral curves of different salt content were almost same trend,the BP neural network model could well reflect the nonlinear relation of soil salt content and spectral reflectance.Reflectance spectrum curve of different texture soil had the critical value of field moisture capacity,when soil water content was higher than field capacity,and the reflectivity increased with soil moisture;reflectivity decreased with the increase of soil water content below field capacity.In the feature band,the model between soil's reflectance and water content was established.