CHARACTERIZATION AND PRESERVATION OF SILT-LADEN SOILS IN THE HUMID DEPRESSIONS OF HATAINVILLE'S DUNE MASSIF (MANCHE, FRANCE) - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2005

CHARACTERIZATION AND PRESERVATION OF SILT-LADEN SOILS IN THE HUMID DEPRESSIONS OF HATAINVILLE'S DUNE MASSIF (MANCHE, FRANCE)

Résumé

The dunes on Cotentin's western toast are a remarkable natural heritage whether from the point of view of geomorphology and landscape or ut biological level of flora. Hatainville's dunes thus have become an example for the preservation of a living and diversified dune massif. Because of their extensive resources, the preservation of the humid depressions in Hatainville's dune massif is considered a priority aim in the preservation project by the 'Conservatoire du littoral'. If that wealth is partly related to the topo -geomorphological conditions of the site, it is actually revealed through the nature and properties of the soils, resulting in ecological and floristic diversity. The soils thus appears as essential studying to understanding the protes of floristic growth and the presence of rare or more common plants (Provost, 1975). That is why, for two years now, we have been focusing research on the relationship between soil and vegetation in the humid depressions. If the relationship between the texture of the soils with the sand basis is generally observed, the significant presence of silt in many pedological profiles is truly typical of soils in humid depressions (Le Gouée et al., 2005). Those silt-laden soils thus appear as a particularly interesting natural heritage as they are closely linked with the presence of hygrophile vegetable communities among which, for example, Apium repens, a species mentioned in Annex II of 'Directive Habitat'. A close analysis both on the site and in laboratories has made it possible to describe the silt soils very accurately, to define the origine of these soils, to confirm the importance of their hydric properties for hygrophile communities, and to work out a precise map of the humid depressions characterized by that type of soil on the site. Actions for the protection of diversity and ecological resources are associated with the tradition of extensive posture which contributes to preservation of Hatainville's dune massif. Yet, the watering places which the humid depressions tan be are not numerous enough. The high density of cattle around the pools leads to an intensive trampling of the soit which seriously endangers its edaphic and ecological balance. The preservation of silt-laden soils as natural heritage thus goes together with the creation of artificial pools accessible to cattle.
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Dates et versions

hal-00283221 , version 1 (29-05-2008)

Identifiants

  • HAL Id : hal-00283221 , version 1

Citer

Patrick Le Gouée. CHARACTERIZATION AND PRESERVATION OF SILT-LADEN SOILS IN THE HUMID DEPRESSIONS OF HATAINVILLE'S DUNE MASSIF (MANCHE, FRANCE). CHARACTERIZATION AND PRESERVATION OF SILT-LADEN SOILS IN THE HUMID DEPRESSIONS OF HATAINVILLE'S DUNE MASSIF (MANCHE, FRANCE), Sep 2005, Koksijde, Belgium. pp.56. ⟨hal-00283221⟩
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