Application Study of the Thermal Infrared Emissivity Spectra in the Estimation of Salt Content of Saline Soil
XIA Jun1,2, TASHPOLAT·Tiyip1,2*, MAMAT·Sawut1,2, ZHANG Fei1,2, HAN Gui-hong1,2
1. College of Resources and Environment Sciences，Xinjiang University，Urumqi 830046，China 2. Key Laboratory of Oasis Ecology under Ministry of Education，Xinjiang University，Urumqi 830046，China
Abstract：Studying of soil salinization is of great significance for agricultural production in arid area oasis, thermal infrared remote sensing technology provides a new technology and method in this field. Authors used Fourier transform infrared spectrometer to measure the oasis saline soil in field, employed iterative spectrally smooth temperature/emissivity separation algorithm(ISSTES) to separate temperature and emissivity, and acquired the thermal infrared emissivity data of the saline soil. Through researching the emissivity spectral feature of saline soil, and concluded that soil emissivity will reduce with the increasing of salt content from 8 to 13 μm, so emissivity spectra is more sensitive to salt factor from 8 to 9.5 μm. Then, analyzed the correlation between original emissivity spectra and its first derivative, second derivative and normalized ratio with salt content, the result showed that they have a negative correlation relationship between soil emissivity and salt content, and the correlation between emissivity first derivative and salt content is highest, reach to 0.724 2, the corresponding bands are from 8.370 745～8.390 880 μm. Finally, established the quadratic function regression model, its determination coefficient is 0.741 4, and root mean square error is 0.235 5, the result explained that the approach of using thermal infrared emissivity to retrieve the salt content of saline soil is feasible.
夏 军1，2，塔西甫拉提·特依拜1，2*，买买提·沙吾提1，2，张 飞1，2，韩桂红1，2 . 热红外发射率光谱在盐渍化土壤含盐量估算中的应用研究[J]. 光谱学与光谱分析, 2012, 32(11): 2956-2961.
XIA Jun1,2, TASHPOLAT·Tiyip1,2*, MAMAT·Sawut1,2, ZHANG Fei1,2, HAN Gui-hong1,2 . Application Study of the Thermal Infrared Emissivity Spectra in the Estimation of Salt Content of Saline Soil. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(11): 2956-2961.
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