Prediction of soil organic carbon in a coal mining area by Vis-NIR spectroscopy

Coal mining has led to increasingly serious land subsidence, and the reclamation of the subsided land has become a hot topic of concern for governments and scholars. Soil quality of reclaimed land is the key indicator to the evaluation of the reclamation effect; hence, rapid monitoring and evaluatio...

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Veröffentlicht in:	PloS one Jg. 13; H. 4; S. e0196198
Hauptverfasser:	Sun, Wenjuan, Li, Xinju, Niu, Beibei
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	United States Public Library of Science 20.04.2018 Public Library of Science (PLoS)
Schlagworte:	Agricultural engineering Aluminum Analysis Biology and Life Sciences Carbon Carbon content Coal mines Coal mining Computer and Information Sciences Convolution Ecology and Environmental Sciences Engineering and Technology Evaluation I.R. radiation Laboratories Land reclamation Land subsidence Light Measurement Methods Mine reclamation Modelling Multiple scattering Near infrared radiation Near-infrared spectroscopy Noise reduction Organic carbon Organic soils Physical Sciences Preprocessing Reclaimed land Reflectance Regression analysis Regression models Research and Analysis Methods Scattering Sensitivity Smoothing Soil carbon Soil properties Soil quality Soil sciences Soils Spectra Spectral reflectance Spectral sensitivity Spectroscopy Transformation China
ISSN:	1932-6203, 1932-6203
Online-Zugang:	Volltext
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Zusammenfassung:	Coal mining has led to increasingly serious land subsidence, and the reclamation of the subsided land has become a hot topic of concern for governments and scholars. Soil quality of reclaimed land is the key indicator to the evaluation of the reclamation effect; hence, rapid monitoring and evaluation of reclaimed land is of great significance. Visible-near infrared (Vis-NIR) spectroscopy has been shown to be a rapid, timely and efficient tool for the prediction of soil organic carbon (SOC). In this study, 104 soil samples were collected from the Baodian mining area of Shandong province. Vis-NIR reflectance spectra and soil organic carbon content were then measured under laboratory conditions. The spectral data were first denoised using the Savitzky-Golay (SG) convolution smoothing method or the multiple scattering correction (MSC) method, after which the spectral reflectance (R) was subjected to reciprocal, reciprocal logarithm and differential transformations to improve spectral sensitivity. Finally, regression models for estimating the SOC content by the spectral data were constructed using partial least squares regression (PLSR). The results showed that: (1) The SOC content in the mining area was generally low (at the below-average level) and exhibited great variability. (2) The spectral reflectance increased with the decrease of soil organic carbon content. In addition, the sensitivity of the spectrum to the change in SOC content, especially that in the near-infrared band of the original reflectance, decreased when the SOC content was low. (3) The modeling results performed best when the spectral reflectance was preprocessed by Savitzky-Golay (SG) smoothing coupled with multiple scattering correction (MSC) and first-order differential transformation (modeling R2 = 0.86, RMSE = 2.00 g/kg, verification R2 = 0.78, RMSE = 1.81 g/kg, and RPD = 2.69). In addition, the first-order differential of R combined with SG, MSC with R, SG together with MSC and R also produced better modeling results than other pretreatment combinations. Vis-NIR modeling with specific spectral preprocessing methods could predict SOC content effectively.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 Competing Interests: The authors have declared that no competing interests exist.
ISSN:	1932-6203 1932-6203
DOI:	10.1371/journal.pone.0196198