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Impact of land use change and agricultural practices on aquatic microbial diversity and functioning in a tropical system

Abstract : Land use (LU) change towards non-sustainable agricultural practices enhances soil degradation, erosion, and the loss of soil microbial diversity. However, the impacts of LU change on in-stream microbial community structure remain poorly understood, particularly in tropical ecosystems. Through controlled experiments and in situ investigations, I assessed how different LU and agricultural practices, via hydrological processes, affect the quantity and quality of stream dissolved organic matter and associated microbial community structure. The results of this work show the importance of considering both past and present LU along with hydrological processes when assessing stream microbial diversity and metabolic capacities. While the experiments in controlled conditions (micro- and mesocosms) allowed disentangling the relative importance of direct overland flow and soil community on stream bacterial structure, the in situ approach gave an integrated view of these processes at the basin scale. This emphasizes the need to use sustainable LU management practices if we wish to mitigate off-site impacts on downstream aquatic systems
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https://tel.archives-ouvertes.fr/tel-02008044
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Thi Huong Le. Impact of land use change and agricultural practices on aquatic microbial diversity and functioning in a tropical system. Ecology, environment. Université de Lyon, 2018. English. ⟨NNT : 2018LYSE1203⟩. ⟨tel-02008044⟩

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