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Measurements of Soil Carbon by Neutron-Gamma Analysis in Static and Scanning Modes
07:51

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Published on: August 24, 2017

Evaluation of three field-based methods for quantifying soil carbon.

Roberto C Izaurralde1, Charles W Rice, Lucian Wielopolski

  • 1Joint Global Change Research Institute, Pacific Northwest National Laboratory and University of Maryland, College Park, Maryland, United States of America. cesar.izaurralde@pnnl.gov

Plos One
|February 6, 2013
PubMed
Summary

Three advanced soil carbon measurement techniques, including Laser Induced Breakdown Spectroscopy (LIBS), Diffuse Reflectance Fourier Transform Infrared Spectroscopy (DRIFTS), and Inelastic Neutron Scattering (INS), showed acceptable field performance compared to dry combustion. Further calibration improvements are recommended.

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Area of Science:

  • Soil Science
  • Analytical Chemistry
  • Environmental Monitoring

Background:

  • Accurate soil carbon density measurement is crucial for environmental monitoring and agricultural management.
  • Traditional dry combustion (DC) methods require laboratory analysis and can be time-consuming.
  • Developing portable, field-deployable methods for soil carbon assessment is a significant research objective.

Purpose of the Study:

  • To evaluate the field performance of three advanced soil carbon measurement technologies: LIBS, DRIFTS, and INS.
  • To compare the results obtained from these advanced methods against the standard dry combustion (DC) method.
  • To assess the portability and applicability of these technologies under field conditions.

Main Methods:

  • Field deployment of LIBS, DRIFTS, and INS instruments for soil carbon density measurements at two distinct locations (USA and Mexico).
  • Comparison of advanced method results with soil samples analyzed via dry combustion (DC) for carbon concentration and bulk density.
  • Independent blind testing of each advanced technique against the reference DC method.

Main Results:

  • LIBS, DRIFTS, and INS methods demonstrated acceptable performance when compared to the standard DC method for soil carbon density.
  • LIBS and DRIFTS, along with DC, require soil sampling and bulk density data for accurate soil carbon density calculation.
  • INS offers the advantage of not requiring soil sampling for its measurements.

Conclusions:

  • The studied advanced technologies (LIBS, DRIFTS, INS) are viable field-portable alternatives to traditional dry combustion for soil carbon density assessment.
  • Further research is needed to refine calibration techniques for enhanced accuracy.
  • These methods show promise for improving the efficiency and accessibility of soil carbon monitoring.