Soil organic matter characterisation by photometric indices or photon correlation spectroscopy: are they comparable?

  • Gergely Jakab Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences https://orcid.org/0000-0001-5424-1983
  • Ádám Rieder Earth Surface Science Institute, University of Leeds
  • Anna Viktória Vancsik Geographical Institute, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences
  • Zoltán Szalai Geographical Institute, Research Centre for Astronomy and Earth Sciences of the Hungarian Academy of Sciences https://orcid.org/0000-0001-5267-411X
Keywords: organic matter composition, tillage, soil carbon, dynamic light scattering

Abstract

Soil organic matter (SOM) is a complex component of soil that acts as basis for most of the soil forming processes. SOM characteristics, including quantity, spatial distribution, molecular size and composition, are the results of environmental effects. SOM is definitely hard to be measured in situ, therefore most investigations are based on incomplete SOM extractions or other proxies. Even though, the traditional humus concept that polymerisation degree of SOM molecules are proportional to their stability are refuted, the concerning proxies for SOM composition predictions are still in use. These are mainly based on the photometric investigations of alkali extractions. However, this extraction method received many rightful critiques, it still could be a possible alternative, since it is quite simple, cheap and represented much more SOM than water extractions. This study aimed to compare SOM composition results based on carbon-nitrogen ratio and alkali extractions measured by UV-vis spectrometry and photon correlation spectrometry on the same soil used as forest and crop field. SOM composition proxies provided inconsistent results using the NaOH extraction method compared with photon correlation. Therefore, the application of organo-mineral SOM protection theory in association with the photometric proxies seems to be difficult in the case of the investigated Luvisol. On the other hand, photon correlation spectroscopy provided results in line with the published results of the organo-mineral stabilization theory that suggested alkali extraction with special care could be a useful alternative. However, due to the known imperfections of it, the application of in situ measurement methods would be preferable.

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Published
2018-06-30
How to Cite
Jakab, G., Rieder, Ádám, Vancsik, A. V., & Szalai, Z. (2018). Soil organic matter characterisation by photometric indices or photon correlation spectroscopy: are they comparable?. Hungarian Geographical Bulletin, 67(2), 109-120. https://doi.org/10.15201/hungeobull.67.2.1
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Articles