Proximal Sensor Identification of Lithologic Discontinuities in Eastern Europe

ProEnvironment Promediu

David Weindorf¹ 

[1] University of Agricultural Sciences and Veterinary Medicine, 3-5 Manastur St., 400372 Cluj-Napoca

关键词: Lithologic discontinuity;    pedology;    proximal sensors;    VisNIR DRS;    PXRF.;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Bioflux SRL

【 摘 要 】

Lithologic discontinuity identification can be laborious when morphological differences between parent materials are not readily apparent. Often, this requires pedologists to wait for laboratory data that can help differentiate parent materials via physico-chemical properties. In this study, visible near infrared diffuse reflectance spectroscopy (VisNIR DRS) and portable x-ray fluorescence (PXRF) spectrometry, were used to produce quantitative spectral and elemental data supportive of rapid parent material differentiationin-situ . Five pedons with suspected lithologic discontinuities were scanned in Hungary and Romania in 2014, morphologically described by trained pedologists, then sampled for standard laboratory characterization. Compared to lab data and/or morphologically described discontinuities, PXRF data was skillful at identifying large, abrupt changes in standardized PXRF differences of elements (DEs), noted in data plots as DE maxima and minima. Standardized VisNIR DRS calculated differences (CDs) in reflectance spectra (350-2500 nm) also identified discontinuities based upon CD reflectance maxima and minima. Within both types of plots, lithologic discontinuities were not well captured by the proximal sensors when CD or DE values fell in active slopes of plot mid-sections. Generally, PXRF appeared slightly better at detecting discontinuities relative to VisNIR DRS. However, VisNIR DRS also showed the ability to identify differences with certain pedons not well captured by PXRF. Both PXRF and VisNIR DRS have been shown to provide useful information which can help in the proper identification of lithologic discontinuitiesin-situ , especially in soils where such features are morphologically nondescript.

【 授权许可】

CC BY