Reflectance spectral characterization and mineralogy of acid sulphate soil in subsurface using hypcrspectral data

• Published in: 国际泥沙研究：英文版 2014, Vol.29 (2), p.149-158
• Main Author: Xian-Zhong SHI Mehrooz ASPANDIAR David OLDMEADOW
• Format: Article
• Language: English
• Subjects: 光谱表征; 反射; 土壤; 快速评估; 扫描电子显微镜; 矿物学; 酸性硫酸盐土; 高光谱数据
• ISSN: 1001-6279

Acid sulphate soil（ASS） is a kind of soil which is harmful to the environment.ASS is hard to efficiently assess efficiently in the subsurface,although it is detectable on the surface by remote sensing.This paper aims to explore a new way to rapidly assess ASS in the subsurface by introducing a proximal hyperspectral instrument,namely the HyloggerTM system which can rapidly scan soil cores and provide high resolution hyperspectral data.Some minerals in ASS,which usually act as indicators of the severity of ASS,such as iron oxides,hydroxides,and sulphates,as well as some clay minerals,such as kaolinite,have diagnostic spectral absorption features in the reflectance spectral range（400-2500 nm）.Soil cores were collected from a study area and hyperspectral data were acquired by HyloggerTM scanning.The main minerals related to ASS were characterized spectrally,and were subsequently identified and mapped in the soil cores based on their reflectance spectral characteristics.Traditional X-ray diffraction（XRD） and scanning electron microscope（SEM） were also applied to verify the results of the mineral identification.The main results of this study include the spectral characterisation of ASS and its main compositional minerals,as well as the distribution of these relevant minerals in different depth of cores.