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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	On the restoration of bogs in the Steinwald
Auteurs :	Julia Laube, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (48(1) JUL 2009)
Article en page(s) :	36-42
Résumé :	On the restoration of bogs in the SteinwaldIn Germany, most of the actual bog-restoration is spent on areas with silvicultural use in the nearer past. This work adresses the question, which effects on vegetation cover is caused by such restoration treatments. The survey was realized in three different mountain bogs in Steinwald (NE-Bavaria). As information about initial conditions (which means about the state before restoration) was missing, space-for-time-substitution was choosen as evaluation method. Data on vegetation, hydrology, pedology and light availability was sampled for different levels of the artificial time series. We chose unchanged and cleared survey plots as well as restored plots (which were cleared and its ditches were closed in different years).Vegetation cover shows a quick (2 years after restoration) response which is characterized by an increasing cover of bog-specific species (mainly peat mosses). This phase is interrupted (or even reversed) within the next few years (already 6 years after restoration). As an important driving factor for this undesirable development the shading of peat mosses by the rising shrub cover Could be identified. The groundwater table influences the favored ilumination of Sphagnum-species: full Sunlight is preffered at wet conditions, on dryer sites peat mosses only occur under shaded conditions. The groundwater table was elevated by restoration, but this effect clearly got Superimposed by a strong, a priori existing inequality of water level. There's a correlation between groundwater level and slope of the bogs: groundwater table near the hilltop lies lower under ground than groundwater near the base. Further restoration programs Should try to involve and use this natural heterogeneity.

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