Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review
Clay minerals are the most reactive and important inorganic components in soils, but soil mineralogy classifies as a minor topic in soil sciences. Revisiting soil mineralogy has been gradually required. Clay minerals in soils are more complex and less well crystallized than those in sedimentary rock...
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doaj-de6e5fb878ce4dbcb94913361b52b5a92020-11-24T23:26:11ZengHindawi LimitedJournal of Spectroscopy2314-49202314-49392018-01-01201810.1155/2018/31689743168974Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A ReviewQian Fang0Hanlie Hong1Lulu Zhao2Stephanie Kukolich3Ke Yin4Chaowen Wang5School of Earth Sciences, China University of Geosciences, Wuhan 430074, ChinaSchool of Earth Sciences, China University of Geosciences, Wuhan 430074, ChinaSchool of Earth Sciences, China University of Geosciences, Wuhan 430074, ChinaDepartment of Geosciences, University of Arizona, Tucson, AZ 85721, USASchool of Earth Sciences, China University of Geosciences, Wuhan 430074, ChinaGemological Institute, China University of Geosciences, Wuhan 430074, ChinaClay minerals are the most reactive and important inorganic components in soils, but soil mineralogy classifies as a minor topic in soil sciences. Revisiting soil mineralogy has been gradually required. Clay minerals in soils are more complex and less well crystallized than those in sedimentary rocks, and thus, they display more complicated X-ray diffraction (XRD) patterns. Traditional characterization methods such as XRD are usually expensive and time-consuming, and they are therefore inappropriate for large datasets, whereas visible and near-infrared reflectance spectroscopy (VNIR) is a quick, cost-efficient, and nondestructive technique for analyzing soil mineralogic properties of large datasets. The main objectives of this review are to bring readers up to date with information and understanding of VNIR as it relates to soil mineralogy and attracts more attention from a wide variety of readers to revisit soil mineralogy. We begin our review with a description of fundamentals of VNIR. We then review common methods to process soil VNIR spectra and summary spectral features of soil minerals with particular attention to those <2 μm fractions. We further critically review applications of chemometric methods and related model building in spectroscopic soil mineral studies. We then compare spectral measurement with multivariate calibration methods, and we suggest that they both produce excellent results depending on the situation. Finally, we suggest a few avenues of future research, including the development of theoretical calibrations of VNIR more suitable for various soil samples worldwide, better elucidation of clay mineral-soil organic carbon (SOC) interactions, and building the concept of integrated soil mapping through combined information (e.g., mineral composition, soil organic matter-SOM, SOC, pH, and moisture).http://dx.doi.org/10.1155/2018/3168974 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Qian Fang Hanlie Hong Lulu Zhao Stephanie Kukolich Ke Yin Chaowen Wang |
spellingShingle |
Qian Fang Hanlie Hong Lulu Zhao Stephanie Kukolich Ke Yin Chaowen Wang Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review Journal of Spectroscopy |
author_facet |
Qian Fang Hanlie Hong Lulu Zhao Stephanie Kukolich Ke Yin Chaowen Wang |
author_sort |
Qian Fang |
title |
Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review |
title_short |
Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review |
title_full |
Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review |
title_fullStr |
Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review |
title_full_unstemmed |
Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review |
title_sort |
visible and near-infrared reflectance spectroscopy for investigating soil mineralogy: a review |
publisher |
Hindawi Limited |
series |
Journal of Spectroscopy |
issn |
2314-4920 2314-4939 |
publishDate |
2018-01-01 |
description |
Clay minerals are the most reactive and important inorganic components in soils, but soil mineralogy classifies as a minor topic in soil sciences. Revisiting soil mineralogy has been gradually required. Clay minerals in soils are more complex and less well crystallized than those in sedimentary rocks, and thus, they display more complicated X-ray diffraction (XRD) patterns. Traditional characterization methods such as XRD are usually expensive and time-consuming, and they are therefore inappropriate for large datasets, whereas visible and near-infrared reflectance spectroscopy (VNIR) is a quick, cost-efficient, and nondestructive technique for analyzing soil mineralogic properties of large datasets. The main objectives of this review are to bring readers up to date with information and understanding of VNIR as it relates to soil mineralogy and attracts more attention from a wide variety of readers to revisit soil mineralogy. We begin our review with a description of fundamentals of VNIR. We then review common methods to process soil VNIR spectra and summary spectral features of soil minerals with particular attention to those <2 μm fractions. We further critically review applications of chemometric methods and related model building in spectroscopic soil mineral studies. We then compare spectral measurement with multivariate calibration methods, and we suggest that they both produce excellent results depending on the situation. Finally, we suggest a few avenues of future research, including the development of theoretical calibrations of VNIR more suitable for various soil samples worldwide, better elucidation of clay mineral-soil organic carbon (SOC) interactions, and building the concept of integrated soil mapping through combined information (e.g., mineral composition, soil organic matter-SOM, SOC, pH, and moisture). |
url |
http://dx.doi.org/10.1155/2018/3168974 |
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