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High resolution soil property maps over mainland France : application to soil organic carbon and its additional sequestration and storage potentials

Abstract : This thesis is a contribution to Digital Soil Mapping (DSM) at broad scale, with applications on the French mainland territory. In Chapter 1, I discussed the main drivers for the rise and development of DSM and gave a brief history about DSM. In Chapter 2, I made a general review about broad-scale DSM by reviewing 160 selected articles from 2003 to mid-2019. I synthetized and discussed the main achievements and challenges for the DSM community. Then I decided to focus on soil organic carbon (SOC) because of its main importance for ecosystem services and global carbon cycle. In Chapter 3, I showed how to improve a national SOC map by merging various SOC maps and provided inputs on how to take advantage of global predictions in ‘data-poor’ countries using a low cost and efficient sampling strategy. Then in Chapters 4 and 5, I focused onthe validity domain of pedotransfer functions used for bulk density predictions and on developing a novel approach to deal with soil thickness prediction over France. I also proposed efficient sampling strategies to improve the accuracy of their predictions. I moved from DSM to Digital Soil Assessment (DSA), exemplified by SOC sequestration potential in Chapter 6 and SOC storage potentials in Chapter 7. They contribute to improving some aspects related to DSM and GlobalSoilMap. In Chapter 8, I finished this thesis by discussing the most important findings of my work and relating them to main challenges of Pedometrics. I outlined the inputs that my work provided to reaching these challenges and highlighted the remaining issues to be solved in
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Songchao Chen. High resolution soil property maps over mainland France : application to soil organic carbon and its additional sequestration and storage potentials. Ecology, environment. Agrocampus Ouest, 2019. English. ⟨NNT : 2019NSARD088⟩. ⟨tel-02970837⟩

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