Vegetation succession processes and fluvial dynamics of a mobile temperate riparian ecosystem: the lower Allier River (France) Processus de succession végétale et dynamique luviale d’un écosystème riverain mobile en zone tempérée : le bas Allier (France)
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18 septembre 2017
- handle: 10670/1.5l26rl
- hal: hal-01673022
- doi: 10.4000/geomorphologie.11805
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info:eu-repo/semantics/altIdentifier/doi/10.4000/geomorphologie.11805
Mots-clés
riparian vegetation hydrogeomorphology spatio-temporal processes Allier River -bio]/Ecology, environment -bio]/Ecology, environment/EcosystemsSujets proches
Natural science Sciences Science of scienceCiter ce document
Virginia Garófano-Gómez et al., « Processus de succession végétale et dynamique luviale d’un écosystème riverain mobile en zone tempérée : le bas Allier (France) », HAL-SHS : géographie, ID : 10.4000/geomorphologie.11805
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Résumé
Many riparian ecosystems in European temperate regions have lost their inherent, highly dynamic character due to human-induced impacts such as river channelization and low regulation. he lower course of the Allier River (France) is one of the last remaining free meandering river segments, and thus, constitutes an opportunity to investigate riparian succession processes of a dynamic, temperate river system. We analyzed (i) the dynamics of the succession phases based on eight sets of aerial images of the riparian corridor over the last five decades (1967-2014), (ii) the dominant succession trajectories and (iii) their relation with the Allier River low regime. Results revealed that the study site was characterized by a shifting habitat mosaic between 1967 and 2005, whilst floods did not change the overall habitat composition of the riparian corridor but their distribution in space. After the year 2005, progression and retrogression processes have been drastically reduced, with an increase of stability (i.e. no more channel migration and neither progression nor retrogression of patches), and a concomitant reduction of high and moderate magnitude floods. his study depicts a clear threshold of trajectory change in succession processes since the beginning of the 21st century and facilitates a better understanding of future trajectories under current global climate change.