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首页> 外文期刊>Journal of spectroscopy >Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review
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Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review

机译：可见和近红外反射光谱法研究土壤矿物学的研究进展

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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).
机译：粘土矿物是土壤中最活泼，最重要的无机成分，但是土壤矿物学在土壤科学中被列为次要主题。逐渐需要重新审视土壤矿物学。土壤中的粘土矿物比沉积岩中的粘土矿物更为复杂且结晶程度较低，因此它们显示出更复杂的X射线衍射（XRD）模式。传统的表征方法（例如XRD）通常昂贵且耗时，因此不适用于大型数据集，而可见光和近红外反射光谱（VNIR）是一种快速，经济高效且无损的技术，用于分析土壤矿物学特性大型数据集。这篇综述的主要目的是使读者了解与土壤矿物学有关的VNIR的最新信息和理解，并吸引众多读者重新关注土壤矿物学。我们从对VNIR基本原理的描述开始我们的审查。然后，我们回顾了处理土壤VNIR光谱的常用方法，并总结了土壤矿物的光谱特征，尤其关注那些<2μm的馏分。我们进一步批判性地回顾了化学计量学方法和相关模型构建在光谱土壤矿物研究中的应用。然后，我们将光谱测量结果与多元校准方法进行比较，并建议根据情况，它们都能产生出色的结果。最后，我们提出了一些未来研究的途径，包括开发更适合于全球各种土壤样品的VNIR理论校准，更好地阐明粘土矿物-土壤有机碳（SOC）的相互作用，以及通过建立综合土壤图谱的概念综合信息（例如，矿物成分，土壤有机质-SOM，SOC，pH和湿度）。

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