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Implementation and initial calibration of carbon-13 soil organic matter decomposition in Yasso model
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  • Jarmo Mäkelä,
  • Laura Arppe,
  • Hannu Fritze,
  • Jussi Heinonsalo,
  • Jari Liski,
  • Markku Oinonen,
  • Petra Straková,
  • Toni Viskari
Jarmo Mäkelä
Finnish Meteorological Institute (FMI)

Corresponding Author:[email protected]

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Laura Arppe
University of Helsinki
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Hannu Fritze
Natural Resources Institute Finland
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Jussi Heinonsalo
University of Helsinki
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Jari Liski
Finnish Meteorological Institute
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Markku Oinonen
University of Helsinki
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Petra Straková
Natural Resources Institute Finland
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Toni Viskari
Finnish Meteorological Institute
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Abstract

Soil carbon sequestration has gained traction as a mean to mitigate rising atmospheric carbon dioxide concentrations. Verification of different methods’ efficiency to increase soil carbon sink requires, in addition to good quality measurements, reliable models capable of simulating the effect of the sequestration practises. One way to get insight of the methods’ effects on carbon cycling processes is to analyse different carbon isotope concentrations in soil organic matter. In this paper we introduce a carbon-13 isotope specific soil organic matter decomposition add-on into the Yasso soil carbon model and assess its functionality. The new 13C-dedicated decomposition is straightforward to implement and depends linearly on the default Yasso model parameters and the relative carbon isotope (13C/12C) concentration. Despite of their simplicity, the modifications considerably improve the model behaviour in a 50-year long simulation.