Vittoz Pascal

Phytosociological study of wetlands and humid grasslands in Vallée de Joux (Switzerland) and next to Chapelle-des-Bois (Franche-Comté, France). Temporal study
Étude phytosociologique de marais et prairies humides à la Vallée de Joux (Suisse) et à Chapelle-des-Bois (Franche-Comté, France). Approche diachronique

Project Number: CH-4952

Project Type:	Master
Project Duration:	07/01/2011 - 01/31/2013 project completed
Funding Source:	other ,
Project Leader:	Dr. Pascal Vittoz Maître d'enseignement et de recherche Institut des dynamiques de la surface terrestre, IDYST Université de Lausanne Géopolis 1015 Lausanne Phone: +41 (0) 24 692 43 67 ; +41 (0) 21 692 35 30 FAX: +41 (0) 21 692 35 05 e-Mail: pascal.vittoz(at)unil.ch http://www.unil.ch/idyst

related to this project.

for which the project has a relevance.

Research Areas:

Landscape

Disciplines:

environmental sciences

Keywords:
wetlands, fens, Jura mountains, phytososciology, vegetation dynamics, management

Abstract:
Wetlands and wet meadows have undergone important loss in this last fifty years and it is useful to reuse old phytosociological data to study how these environments have changed. In his thesis published in 1982, Jean-Daniel Gallandat draws three phytosociological maps of wetlands areas in the French and Swiss Jura. We used these maps to study the vegetation evolution. We focussed on four phytosociological alliances: Caricion davallianae a small sedge fen formation, Molinion, Calthion and Filipendulion for the wet meadows. First we set the actual typology of the relevés by using Gallandat’s synsytem and in a second time we compared our data with a set of Gallandat’s relevés.
We found certain stability in the vegetation but with a tendency to have more species associated to meadows. Moreover, the relevés were drier in 2011 than in the seventies. The Caricion davallianae showed the most important changes. Filipendulion developped in some areas by replacing the Calthion. Molinion wun replaced in some areas the Caricion davallianae. However, the Molinion have a tendency to change because of the abandonment of mowing in some areas of the French site. In this site a disturbed hydrology was revealed by the vegetation changes.
The changes observed in this study are mainly due to the changes of management. In order to keep these environments healthy, it would be necessary to maintain or restore the traditional management.

Leading questions:
Dynamics of wetlands in the last decades: impact of management on the composition.

Publications:
Maire, A.-L. (2013). Étude phytosociologique de marais et prairies humides à la Vallée de Joux (Suisse) et à Chapelle-des-Bois (Franche-Comté, France). Approche diachronique. Non publié. Travail de Master, Universités de Neuchâtel et Lausanne, 82 p. + annexes.


Last update: 5/18/18
Source of data: ProClim- Research InfoSystem (1993-2024)
Update the data of project: CH-4952

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