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Evaluation du stock et de la stabilité du carbone organique dans les sols urbains

Abstract : Soils are the largest terrestrial pool oforganic carbon and thus play a key role in mitigatingclimate change. The urban soils account for 3% of theworld’s territory and urbanization is currently theprimary cause of land use change. The increase ofartificial areas have led to a growing interest in theurban soil ability to store organic carbon. This workaimed to understand the contribution of urban soils tothe global organic carbon stock and to propose astandardized method for its monitoring. The researchalso focused on studying the stability of organic carbonin urban soils and modeling its dynamics. A databasewas built using data available at the French territorylevel as well as using additional measurements acquired in three French cities.The organic carbon stock in urban open soils aresimilar between cities, and equivalent, or even higherin depth, than that of surrounding forest soils. Thestock in open soils is particularly dependent upon themanagement methods of the urban green spaces,and on the specific site history. Thus, open urban soilsare characterized by a high proportion of labileorganic matter at 0-44 cm depth. Conversely, sealedsoils have very low carbon stocks. They arecharacterized by a high proportion of stable organicmatter whose evolution (storage or mineralization)depends on the dormant state of the microbialcommunities. A conceptual model of carbon dynamicsfor these two soil types has been developed. Finally,recommendations for optimizing carbon monitoringand urban soil management have been proposed
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Submitted on : Wednesday, April 3, 2019 - 10:06:08 AM
Last modification on : Monday, July 6, 2020 - 3:38:30 PM


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  • HAL Id : tel-02088714, version 1


Aurélie Cambou. Evaluation du stock et de la stabilité du carbone organique dans les sols urbains. Sciences de la Terre. Agrocampus Ouest, 2018. Français. ⟨NNT : 2018NSARD086⟩. ⟨tel-02088714⟩



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