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标题：Investigations into Soil Composition and Texture Using Infrared Spectroscopy (2–14 <svg style="vertical-align:-3.69pt;width:14.375px;" id="M1" height="14.8125" version="1.1" viewBox="0 0 14.375 14.8125" width="14.375" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(.022,0,0,-.022,.062,10.15)"><path id="x1D741" d="M583 83l20 -12q-58 -103 -161 -103q-28 0 -42.5 17.5t-14.5 43.5q0 30 16 78l-3 1q-23 -44 -62 -77t-73 -33q-39 0 -55 27h-2l-15 -59l-13 -52l-11 -38q-15 -57 -31 -81h-103q24 41 48 138l122 517h113l-74 -317q-3 -12 -3 -23q1 -21 9.5 -29t30.5 -8q49 0 103 91
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作者：Robert D. Hewson ; Thomas J. Cudahy ; Malcolm Jones 等
期刊名称：Applied and Environmental Soil Science
印刷版ISSN：1687-7667
电子版ISSN：1687-7675
出版年度：2012
卷号：2012
DOI：10.1155/2012/535646
出版社：Hindawi Publishing Corporation
摘要：The ability of thermal and shortwave infrared spectroscopy to characterise composition and texture was evaluated using both particle size separated soil samples and natural soils. Particle size analysis and separation into clay, silt, and sand-sized soil fractions was undertaken to examine possible relationships between quartz and clay mineral spectral signatures and soil texture. Spectral indices, based on thermal infrared specular and volume scattering features, were found to discriminate clay mineral-rich soil from mostly coarser quartz-rich sandy soil and to a lesser extent from the silty quartz-rich soil. Further investigations were undertaken using spectra and information on 51 USDA and other soils within the ASTER spectral library to test the application of shortwave, mid- and thermal infrared spectral indices for the derivation of clay mineral, quartz, and organic carbon content. A nonlinear correlation between quartz content and a TIR spectral index based on the 8.62 μm was observed. Preliminary efforts at deriving a spectral index for the soil organic carbon content, based on 3.4–3.5 μm fundamental H–C stretching vibration bands, were also undertaken with limited results.