Effets des perturbations liées à l'eutrophisation et l'acidification des cours d'eau des Vosges du nord sur les phytocénoses aquatiques : approche spatio-temporelle et expérimentale

Abstract : aIn the Northern Vosges, a study has clearly shown the impact of eutrophication on the macrophyte communities during three years (1993-1995). The first determining factor of the macrophyte distribution is the mineralization. The second discriminant variable of the floristic composition is a trophic gradient. Disturbancefactors include changes in nutrient levels (trout hatcheries, waste water, ponds). The floristic composition, which is characteristic of oligotrophic waters upstreams, changes to that of an eutrophic situation as originally found downstream. The comparison between Northern Vosges, Britain and Lozere has shown that the macrophyte communities present homologous species. A comparison between Northern Vosges and Alsatian Plain has established that the common species colonize different nutrient levels in these two area. An experimental study of nitrogen and of phosphorus of macrophyte reveal the importance of nutrients on macrophyte species distribution. In order to follow acidification status and to research the impacts of acidification on macrophyte communities, 41 sites were studied during two years (1993-1995). It was estblished that several weeckly mineralized streams were acidified and the impact of acidification on aquatic plant species were shown. Macrophyte species present a differential tolerance to acidification. A comparison between northern Vosges and Donon mountain has established that the composition of aquatic plants is different in these two sites (Bryophyte species in Donon, phanerogame species in Northern Vosges)
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Gabrielle Thiébaut. Effets des perturbations liées à l'eutrophisation et l'acidification des cours d'eau des Vosges du nord sur les phytocénoses aquatiques : approche spatio-temporelle et expérimentale. Sciences agricoles. Université Paul Verlaine - Metz, 1997. Français. ⟨NNT : 1997METZ025S⟩. ⟨tel-01777154⟩

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