Etude de dendrochronologie dans le lit majeur de l'Ain : la forêt alluviale comme descripteur d'une 'métamorphose fluviale' / A dendrochronological study in the Ain floodplain : the alluvial forest, as an indicator of 'fluvial metamorphosis'

摘要

As the alluvial vegetation may be considered as a indicator of river dynamics, a dendrochronological study of "black" poplars (Populus nigra) was performed in the floodplain of the lower Ain river. It confirms a metamorphosis which has affected the river over the last 30 years. The phenomenon may be attributed to the combined effects of anthropic impacts upon the river (dams, dykes...) and to the recent reduction of peak discharges.