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Survie des semis de ligneux pionniers dans les lits fluviaux : approche in et ex situ des facteurs de contrôle abiotiques et biologiques des espèces Populus nigra et Salix alba

Abstract : The survival of woody pioneer seedlings recruited during subsequent floods depends on hydro-sedimentary constraints applied on seedlings but also on their ability to withstand these stresses. The main goal of this study is to understand at a fine spatial and time scale the key parameters of seedlings survival for two species, Populus nigra and Salix alba, during floods after their recruitment. A combined in and ex situ approach was conducted to (i) characterize stresses (identification and quantification) applied on seedlings during floods, and (ii) analyze the own seedlings resistance ability to the identified constraints. The in situ approach focused on a forced alluvial mid-channel bar located in the middle reaches of the Loire river. Topographic, bathymetric, velocimetric surveys were conducted and sediment grain size analyses were performed to detail intensity, evolution over time and spatial distribution of drag forces involved in seedlings uprooting, and heights of erosion and deposition respectively responsible for excavation and burying of seedlings. Results suggest that the specific bar dynamics of this forced alluvial mid-channel bar subjected to seedling recruitment influence the survival pattern of seedlings. The ex situ approach provides data for the two species of the growth diversity of the stem and the root system, the strength needed for seedling uprooting and resistance to burial as a function of sediment texture. The confrontation between ex situ measurements and in situ stresses applied is helpful to refine the understanding of seedlings survival pattern on the forced bar.
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https://hal.inrae.fr/hal-02618683
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Submitted on : Monday, May 25, 2020 - 3:16:17 PM
Last modification on : Monday, November 30, 2020 - 6:54:02 AM

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Coraline Wintenberger, Stéphane Rodrigues, Philippe Jugé, Marc Villar. Survie des semis de ligneux pionniers dans les lits fluviaux : approche in et ex situ des facteurs de contrôle abiotiques et biologiques des espèces Populus nigra et Salix alba. Géomorphologie : relief, processus, environnement, Groupe français de géomorphologie (GFG), 2017, 23 (3), pp.233-252. ⟨10.4000/geomorphologie.11789⟩. ⟨hal-02618683⟩

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