Publications des scientifiques de l'IRD

Pansu Marc, Sarmiento L., Rujano M. A., Ablan M., Acevedo D., Bottner P. (2010). Modeling organic transformations by microorganisms of soils in six contrasting ecosystems : validation of the MOMOS model. Global Biogeochemical Cycles, 24, GB1008. ISSN 0886-6236.

Titre du document
Modeling organic transformations by microorganisms of soils in six contrasting ecosystems : validation of the MOMOS model
Année de publication
2010
Type de document
Article référencé dans le Web of Science WOS:000275035900001
Auteurs
Pansu Marc, Sarmiento L., Rujano M. A., Ablan M., Acevedo D., Bottner P.
Source
Global Biogeochemical Cycles, 2010, 24, GB1008 ISSN 0886-6236
The Modeling Organic Transformations by Microorganisms of Soils (MOMOS) model simulates the growth, respiration, and mortality of soil microorganisms as main drivers of the mineralization and humification processes of organic substrates. Originally built and calibrated using data from two high-altitude sites, the model is now validated with data from a C-14 experiment carried out in six contrasting tropical ecosystems covering a large gradient of temperature, rainfall, vegetation, and soil types from 65 to 3968 m asl. MOMOS enabled prediction of a greater number of variables using a lower number of parameter values than for predictions previously published on this experiment. The measured C-14 mineralization and transfer into microbial biomass (MB) and humified compartments were accurately modeled using (1) temperature and moisture response functions to daily adjust the model responses to weather conditions and (2) optimization of only one parameter, the respiration rate k(resp) of soil microorganisms at optimal temperature and moisture. This validates the parameterization and hypotheses of the previous calibration experiment. Climate and microbial respiratory activity, related to soil properties, appear as the main factors that regulate the C cycle. The k(resp) rate was found to be negatively related to the fine textural fraction of soil and positively related to soil pH, allowing the proposition of two transfer functions that can be helpful to generalize MOMOS application at regional or global scale.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Pédologie [068] ; Biologie du sol [074]
Identifiant IRD
PAR00004776
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