M. Ogrič
Soil organic carbon predictions in Subarctic Greenland by visible–near infrared spectroscopy
Ogrič, M.; Knadel, M.; Kristiansen, S.M.; Peng, Y.; De Jonge, L.W.; Adhikari, K.; Greve, M.H.
Authors
M. Knadel
S.M. Kristiansen
Y. Peng
L.W. De Jonge
K. Adhikari
M.H. Greve
Abstract
Release of carbon from high-latitude soils to the atmosphere may have significant effects on Earth’s climate. In this contribution, we evaluate visible–near-infrared spectroscopy (vis-NIRS) as a time- and cost-efficient tool for assessing soil organic carbon (SOC) concentrations in South Greenland. Soil samples were collected at two sites and analyzed with vis-NIRS. We used partial least square regression (PLS-R) modeling to predict SOC from vis-NIRS spectra referenced against in situ dry combustion measurements. The ability of our approach was validated in three setups: (1) calibration and validation data sets from the same location, (2) calibration and validation data sets from different locations, and (3) the same setup as in (2) with the calibration model enlarged with few samples from the opposite target area. Vis-NIRS predictions were successful in setup 1 (R2 = 0.95, root mean square error of prediction [RMSEP] = 1.80 percent and R2 = 0.82, RMSEP = 0.64 percent). Predictions in setup 2 had higher errors (R2 = 0.90, RMSEP = 7.13 percent and R2 = 0.78, RMSEP = 2.82 percent). In setup 3, the results were again improved (R2 = 0.95, RMSEP = 2.03 percent and R2 = 0.77, RMSEP = 2.14 percent). We conclude that vis-NIRS can obtain good results predicting SOC concentrations across two subarctic ecosystems, when the calibration models are augmented with few samples from the target site. Future efforts should be made toward determination of SOC stocks to constrain soil–atmosphere carbon exchange.
Citation
Ogrič, M., Knadel, M., Kristiansen, S., Peng, Y., De Jonge, L., Adhikari, K., & Greve, M. (2019). Soil organic carbon predictions in Subarctic Greenland by visible–near infrared spectroscopy. Arctic, Antarctic, and Alpine Research, 51(1), 490-505. https://doi.org/10.1080/15230430.2019.1679939
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 4, 2019 |
Online Publication Date | Nov 7, 2019 |
Publication Date | 2019 |
Deposit Date | Nov 26, 2019 |
Publicly Available Date | Nov 27, 2019 |
Journal | Arctic, Antarctic, and Alpine Research |
Print ISSN | 1523-0430 |
Electronic ISSN | 1938-4246 |
Publisher | Institute of Arctic and Alpine Research |
Peer Reviewed | Peer Reviewed |
Volume | 51 |
Issue | 1 |
Pages | 490-505 |
DOI | https://doi.org/10.1080/15230430.2019.1679939 |
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Copyright Statement
© 2019 The Author(s). Published with license by Taylor & Francis Group, LLC.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted
use, distribution, and reproduction in any medium, provided the original work is properly cited.
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