Browsing by Subject "Biotopschutz"

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Ableitung von Restitutionspotenzialen als Entscheidungshilfe bei der Umsetzung von Moorschutzprogrammen
(2005) Röhl, Markus; Böcker, Reinhard
As one of the last peatland-rich states of Germany, Baden-Württemberg possesses no self-standing, conservation program to protect its peatlands. Therefore, after consideration of the state administration, a strategy should be created in the next few years for a Baden-Württemberg peatland protection concept. With this in mind, a methodology for the derivation of peatland restitution potential was developed that can direct the future implementation of such a strategy. The exemplary methodology was developed for the nature conservation area ?Schwenninger Moos?, a medium sized former raised bog strongly disturbed by peat digging and agricultural amelioration. The results were applied to the entire surrounding bio-geographical region, the Baar and the Baaralb. Through this verification of the methodology, significant shortfalls in the state-wide dataset could become evident. As the basis of the evaluation of the restitution potential, data concerning the water level, trophy, and species and biotypes in Schwenninger Moos were collected. The water level of Schwenninger Moos was documented through 34 water gauges, the data from which was analysed through various methods. The half-year median and the combined examination of amplitude, average, and minimum values proved especially suitable for the characterisation of the sites. The trophic classifications of the sites were compared through measuring the principal nutrient levels, pH and conductivity values, as well as the C/N ratio. The vegetation of the investigation area was mapped and the results were subsequently compared to the mapping of biotypes of Baden-Württemberg, the mapping performed in the frame of Natura 2000, as well as that of indicator species groups. The mapping of indicator-species groups proved particularly suitable for the appraisal of the current status of a moor complex. The available data on the mires from the peatland register of Baden-Württemberg were somewhat old (40 years). Therefore these data were verified through comparison-boring and continued measurement by means of georadar. Significant differences arose in a number of comparisons between the peatland register and the author?s investigations with respect to the positional accuracy and the stratum sequence. The derivation of the restitution potential was carried out through the combination of three separate assessments: rewetting-possibility, biotic potential, and conversion potential. These three factors were derived through verbal-argument and brought together in a simple, five-step classification. The rewetting-possibility of an area is the main factor determining the restitution, and it depends considerably on drainage systems, topography, condition of the peat, and the water level. The biotic potential consists of the presence of peat-producing plants and the effects of rewetting on populations of endangered species. The conversion potential is essentially dependent on the dominant uses, ownership and social framework. The methodology was applied to altogether 34 peatland complexes of the Baar and Baaralb. The identification of these locations was only possible by a laborious combination of the peatland register, pedological cartography and conservation-oriented publications. It was found that the peatland register exhibited substantial deficits regarding the classification of small and shallow-layered locations in the Baar. Data concerning vegetation and the occurrence of animals and plants were available for the derivation of the restitution potential. However, some of these proved too old and/or too inaccurate or not spatially verified. Little to no data were present as to the water balance and drainage systems. Only three of the 34 locations exhibited a high restitution potential. 23,5% were classified as having moderate restitution potential; most of these sites are already under protection as nature conservation sites. A slight restitution potential was present in a total of 38.2% of the mire complexes, which consist mostly of small-scale spring mires and intensively agriculturally and silviculturally used locations. Likewise, 29.4% of the moorlands exhibited no more restitution potential. For the implementation of a state-wide mire protection program in the context of the investigation, the substantial deficits were pointed out and recommendations for action were formulated. Primarily, an updated and complete peatland register must be available. Furthermore, vegetation and endangered species maps of the entire peatland complexes protected as high conservation value areas should be available. It is in this regard that a system of indicator vegetation units of south German mires is to be aimed for, as is employed in northeast Germany, for example. Lists of priority sites should be made by regional teams of experts for the respective moor regions or administrative districts.