Cristin-resultat-ID: 1745861
Sist endret: 11. november 2019, 10:33
Resultat
Poster
2019

Modelling soil moisture controls on SOC decomposition across sites with the Jena Soil Model (JSM)

Bidragsytere:
  • Bernhard Ahrens
  • Marleen Pallandt
  • Markus Reichstein
  • Holger Lange
  • Marion Schrumpf og
  • Sonke Zaehle

Presentasjon

Navn på arrangementet: AGU Fall Meeting
Sted: San Franscisco
Dato fra: 9. desember 2019
Dato til: 13. desember 2019

Arrangør:

Arrangørnavn: American Geophysical Union

Om resultatet

Poster
Publiseringsår: 2019

Beskrivelse Beskrivelse

Tittel

Modelling soil moisture controls on SOC decomposition across sites with the Jena Soil Model (JSM)

Sammendrag

The Jena Soil Model (JSM) is a multi-layer mechanistic soil biogeochemistry model with explicit representations of vertical transport, mineral sorption, and microbial control on decomposition rates. Reaction rates are further modified by temperature and moisture. While temperature determines the maximum reaction velocity (Vmax), moisture reduces this rate nonlinearly if either the diffusion of substrate is restricted (at low soil moisture) or oxygen availability for microbes is limited (at wet conditions). This moisture control on soil organic matter formation and decomposition is represented with the Dual Arrhenius Michaelis-Menten (DAMM) model concept (Davidson et al. 2012) and influences the reaction rates of microbial depolymerisation of litter and microbial residue pools as well as DOC (dissolved organic matter) uptake. Sorption of DOM and microbial residues to mineral surfaces is moisture dependent through a Langmuir sorption approach. We will validate the carbon cycle representation of moisture control on soil organic matter decomposition in JSM by comparing simulations with measured carbon stocks and respiration rates from different ecosystems ranging from boreal upland forests and wetlands to Mediterranean savannas. The modular structure of JSM will allow us to investigate the effect of moisture control on each decomposition step (depolymerisation, microbial uptake and growth, and OC sorption) separately.

Bidragsytere

Bernhard Ahrens

  • Tilknyttet:
    Forfatter
    ved Max-Planck-Institut für Biogeochemie

Marleen Pallandt

  • Tilknyttet:
    Forfatter
    ved Max-Planck-Institut für Biogeochemie

Markus Reichstein

  • Tilknyttet:
    Forfatter
    ved Max-Planck-Institut für Biogeochemie

Holger Lange

  • Tilknyttet:
    Forfatter
    ved Divisjon for miljø og naturressurser ved Norsk institutt for bioøkonomi

Marion Schrumpf

  • Tilknyttet:
    Forfatter
    ved Max-Planck-Institut für Biogeochemie
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