Spectral Sensitivity Of Soil Moisture, Poyang Lake Area

Through the comparison on the selection differences of soil moisture sensitive bands in literatures at home and abroad, this study put forward and research the question of the distribution of the soil sensitive bands in thermal infrared spectra under the different moisture change range. In the first place, the study has chosen seven soil samples on six sites of three elevations in Poyang Lake Area and designed the control schemes to get the two kinds of soil surface moisture change range----interval precipitation and the daily evaporation, and then simultaneous observe the soil surface under the changing of soil moisture by using SVC HR-1024 Field Spectrometer and 102 F Portable Fourier Transform Thermal Infrared Spectrometer. After obtained the visible-near infrared(350~2 500 nm) reflectance spectra and the thermal infrared(8~13 μm) emissivity spectra data, the analysis through the Two-Dimensional correlation spectroscopy software, 2Dshige, finally drew the following conclusions:Firstly, the Two-Dimensional correlation spectroscopy is an effective method to extract the soil moisture sensitive bands in thermal infrared spectroscopy;Secondly, when the moisture of the experiment soil surface has a higher value, the visible-near infrared reflectance spectra and the thermal infrared emissivity spectra of the soil surface would be sensitive to the moisture in a longer wavelength and the sensitive bands of the experiment soil moisture in the thermal infrared area has a redshift while the soil moisture increased.