4.2 Article

Stocks, composition and vulnerability to loss of soil organic carbon predicted using mid-infrared spectroscopy

Journal

SOIL RESEARCH
Volume 56, Issue 5, Pages 468-480

Publisher

CSIRO PUBLISHING
DOI: 10.1071/SR17221

Keywords

carbon accounting; crop management; partial least-squares regression; soil carbon fractions; tillage

Categories

Funding

  1. Plant & Food Research's Land Use Change and Intensification Program
  2. Ministry of Business, Innovation and Employment [C02X0812]
  3. Ministry for Primary Industries Sustainable Farming Fund
  4. Foundation for Arable Research
  5. New Zealand Agricultural Greenhouse Gas Research Centre
  6. New Zealand Ministry of Business, Innovation & Employment (MBIE) [C02X0812] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)

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Developing a routine and cost effective capability for measuring soil organic carbon (SOC) content and composition will allow identification of land management practices with a potential to maintain or enhance SOC stocks. Coupling SOC content data and mid-infrared (MIR) spectra through the application of partial least-squares regression (PLSR) analyses has been used to develop such a prediction capability. The objective of this study was to determine whether MIR/PLSR analyses provide accurate estimates of the content and composition of SOC that can be used to quantify SOC stocks and its potential vulnerability to loss. Soil was collected from a field trial incorporating a range of land use (pasture, arable cropping and bare fallow) and tillage (intensive, minimum and no tillage) treatments over a nine-year period. The SOC content was measured by dry combustion analysis. Particulate organic carbon was separated from other forms of carbon on the basis of particle size (SOC in the > 50 mu m fraction). Resistant organic carbon was quantified using solid-state C-13 nuclear magnetic resonance. The MIR/PLSR algorithms were successfully developed to predict the natural logarithms of the contents of SOC and POC in the collected soils. With initial calibration, a single MIR analysis could be used in conjunction with PLSR algorithms to predict the content of SOC and its allocation to component fractions. The MIR/PLSR predicted SOC contents provided reliable estimates of the impact of agricultural management on the 0-25-cm SOC stocks, as well as an indication of the vulnerability of SOC to loss. Development of this capability will facilitate the rapid and cost effective collection of SOC content data for detecting the impact of agricultural management treatments on SOC stocks, composition and potential vulnerability to change.

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