Study on Water-Salt Information and Spectral Characteristics of Saline Soil in the Weigan and Kuqa River Delta Oasis of the Middle Reaches of Tarim River

Water and salt of soils varied spatially and temporally,which were two important factors to influence the spectral characteristics of soils.To know the relationship between water and salt of soils and between water-salt and spectral characteristics of soils was very important for monitoring soil salinization using remote sensing spectral information.Based on water-salt data of 10cm depth and field spectra data of surface soils measured by Hydra Soil Moisture Probe and ASD FieldSpec Pro FR hand-held spectrometer respectively in October,2010 in the delta oasis of Weigan and Kuqa rivers,the study on water-salt and field spectral characteristics of soil salinization was carried out.The results showed that the relationship between soil moisture(WFV) and soil conductivity(Soil C) could be estimated using cubic curve,and the correlation coefficient is 0.8503,the relationship between soil salinity and soil conductivity(Soil C) also could be estimated using cubic curve,and the correlation coefficient is 0.842,but the relationship between soil moisture(WFV) and soil salinity is relatively weak.The correlation coefficient is 0.74.Compared with original spectral data,the pearson coefficients between soil moisture and field spectra after continuum-removed of surface soil and between soil conductivity and field spectra after continuum-removed of surface soil were improved,and then the predicted models for soil moisture and soil conductivity was built using the field spectral bands after continuum-removed by backward linear regression method.