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Commission Européenne (CORDIS) 2020

GLOBALECOEVO Integrating Microbial Evolution into Biogeochemical Models to Predict Soil Response to Drought

Microbial Models Soil Drought

CORDIS (Service Communautaire d’Information sur la Recherche et le Développement) Commission Européenne

Titre : GLOBALECOEVO Integrating Microbial Evolution into Biogeochemical Models to Predict Soil Response to Drought

Région : Global

Code du projet : 891576

Durée : Start date 1 June 2020 // End date 30 September 2023

Objectif
Soil is both the largest sink and source of organic carbon (C) exchanged with the atmosphere. These exchanges result from biological processes, the primary source being the decomposition of soil organic matter (SOM), which is controlled by physical factors such as climate. As such, soil C emissions are very vulnerable to climate change but can also be reduced with new land management practices if we can predict the outcomes of soil carbon-climate feedbacks. However, predictions from the existing large-scale soil C models strongly diverge, and reveal large uncertainties in the processes and controls at play. One of these uncertainties is the effect of change in precipitation regimes on SOM decomposition mediated by soil microorganisms. Functions describing the decomposition response of soil carbon to soil moisture are static in current large-scale models, yet recent empirical studies show that decay responses under new soil moisture conditions can change due to shifts in microbial communities. Recent evidence suggests that evolution is a key processes driving these shifts in microbial communities. This project proposes to integrate variable decomposition-moisture functions into a large-scale soil C model to reflect precipitation history and carbon substrate influence on microbial responses to changing soil moisture. These functions will be calculated from a mechanistic microbial model that accounts for both ecological and evolutionary processes. The mechanistic model will be an updated version of the trait-based model DEMENT developed by the fellow’s supervisor at the partner institution (UC Irvine). The moisture response functions will be integrated into a commonly used soil carbon model, RothC, that has been incorporated into the global land surface model (ORCHIDEE) of the host institution (LSCE).

Participants au projet
Coordinateur : UNIVERSITE DE VERSAILLES SAINT-QUENTIN-EN-YVELINES.

Budget
Coût total : € 257 619,84
Contribution UE : € 257 619,84

CORDIS

Page publiée le 22 janvier 2021