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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

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WP1 - Microcosms experiment

Soil architecture controls over carbon mineralization and nitrous oxide emission

Coordinator : Claire Chenu - Main Participants: Laure Vieublé, Naoise Nunan, Catherine Hénault, Patricia Laville, Yolaine Goubard, Valérie Bergheaud, Valérie Pouteau, 50% PhD1

Objectives: The objectives are twofold:

1- to provide a set of measurements of biodegradation under different micro-environmental conditions (i.e., different pore architectures, water contents, organic matter distributions –with different decomposer communities) in order to calibrate and validate the models developed in WP3. A first simulation exercise, using the models developed in the MEPSOM project, will serve to identify the range of conditions to be considered;

2- to improve our understanding of how these soil micro-heterogeneity determine the mineralization of organic matter and the nitrous oxide emissions                             

WP1.1. Preliminary scenario modeling

The modellers : O. Monga, V.Pot, R. Falconer and all others

WP1.2. Soil architecture and organic substrate location controls over CO2-N2O emissions: manipulative microcosms experiments.

L. Vieublé, Y. Goubard, V. Bergheaud, N. Nunan, S. Schmidt, C. Girardin, C. Chenu, V. Pouteau, C. Hénault, P. Laville, V. Pot, requested PhD 1

WP1.3. Dataset of CO2-N2O emissions: measurements on undisturbed soil cores.

C. Chenu, N. Nunan, P. Laville

WP1.4. Dependency of the variation of CO2 emissions with scale

N. Nunan, C. Girardin, V. Pouteau


-  Experimental data of N2O and CO2 from selected contrasted situations to test models of WP3

-  Different spatial distributions of fresh plant residues in cores to be visualized and quantified as spatial descriptors by μCT for WP2.

-  Hierarchy of soil structure drivers of organic matter decomposition : pore size distribution and connectivity, degree of pores saturation with water and organic matter localization for WP4