Tarbeker Moor Nature Reserve: A Detailed Geographic Atlas of Restored Peatland Landscapes

The boggy surroundings of Tarbeker Moor took shape in the geologically recent aftermath of the last ice age, when peat-forming conditions developed inside a glacial meltwater channel. For thousands of years the wider peatland complex gathered thickness and ecological complexity, but the modern history of the site is largely a story of loss followed by restoration. During the nineteenth and twentieth centuries, the surrounding bogs were drained and progressively converted to grassland and farmland, a pattern common across much of Schleswig-Holstein. Tarbeker Moor was itself exploited as a source of peat from 1951 until 1990, with industrial cutting so intensive that large parts of the bog were removed down to the mineral subsoil. By the end of that period, the original raised bog vegetation had effectively been destroyed. The decisive turning point came in 1991 with the start of a deliberate renaturation program targeting what remained of the still-recoverable bog. The key strategy was rewetting, achieved by damming the Tensfelder Au and allowing groundwater and slope runoff to recharge the substrate. Within a decade this rewetting produced the renewed transitional and floating-mat communities that now define the site. In 2004 the area was formally recognized as an FFH habitat protection area under the European Union Habitats Directive, registered as FFH-Gebiet Nr. 1927-352. Since then, management has focused on optimizing the saturation status of the peat body and on supporting the dispersal of the otter through the connected stream corridor. The site's designation reflects both its ecological recovery and its recognized regional importance as a large-scale, regenerable bog landscape.

Tarbeker Moor sits within the gently undulating terrain of central Schleswig-Holstein, north of Bad Segeberg. The defining landform is the broad, shallow trough of an ancient glacial meltwater channel, in which peat accumulated over thousands of years after the retreat of the Pleistocene ice sheets. Today that trough reads as a quiet, low-lying basin bordered by slightly higher agricultural land. The surface of the protected area is a small-scale patchwork rather than a uniform expanse. Open, still water surfaces dominate the western section, broken by low ridges and dams of residual peat that were partly shaped by former extraction activity. To the east, the terrain carries denser stands of sedge and willow scrub that grew up on the drained but subsequently rewetted cutover fields. Across the site, peat dams and shallow depressions create a subtly varied topography that strongly influences the distribution of vegetation and water.

Ecologically, Tarbeker Moor is a textbook example of a regenerating transitional mire with strong raised-bog affinities. The rewetting of the former peat fields has allowed several distinct vegetation zones to redevelop in close proximity, producing a tight mosaic of ecological conditions on a relatively small footprint. Floating mats formed by peat mosses, water arum, and bladderwort occupy the deeper, permanently flooded western basins. Extending outward from these mats are communities of tufted sedge and cyperus sedge, with grey willow increasingly present in the eastern parts of the site. Soft rush stands fringe the wetter zones and colonize transitional areas. In the rain-fed hollows, classic bog vegetation has returned, with white beak-sedge forming characteristic tussocks alongside hare's-tail cottongrass. Protected habitat types recorded for the site include renaturable degraded raised bogs, transitional and floating-mat mires, and bog hollows with beak-sedge communities. The presence of relatively rare peat mosses such as Sphagnum subnitens and Sphagnum riparium, together with reed, bulrush, and water soldier, indicates that the site is attaining genuine bog-like character rather than merely reverting to generic wetland vegetation.

Tarbeker Moor's wildlife value lies primarily in its moisture-dependent fauna, which has rebounded strongly alongside the restored hydrology. The area is particularly significant for amphibians, with species such as the common toad and the moor frog finding breeding habitat in the combination of open water, floating vegetation mats, and saturated terrestrial margins that the site now offers. Mammal interest is concentrated along the Tensfelder Au watercourse, which crosses the protected area and supports the Eurasian otter. The otter's continued presence, and the corridor function of the stream, are explicit conservation targets for the site management. Beyond these focal species, the mix of open water, sedge, willow scrub, and adjacent agricultural land creates habitat conditions for a wide range of generalist wetland-associated fauna, from aquatic invertebrates to typical moorland bird communities.

Tarbeker Moor carries formal European conservation recognition as a Natura 2000 habitat protection area, designated under the EU Habitats Directive. Its designation rests on three broad strengths: the diversity of bog-related species and habitats present, the visible success of its restoration trajectory, and its size relative to other comparable sites in the region. Together these factors give it a status of statewide significance within Schleswig-Holstein. The overarching conservation goal at the site is to push the vegetation further along the gradient from transitional mire back toward a fully developed raised bog. Achieving this depends on sustained optimization of the watertable across the peat body, which is the single most important management lever available. Equally important is preserving the suitability of the Tensfelder Au corridor as a movement route for the otter, an objective that connects local wetland management with broader landscape-scale mammal conservation.

Tarbeker Moor stands out for the speed and clarity of its ecological recovery following decades of industrial peat extraction. The site demonstrates how a former cutover bog, once stripped to mineral soil, can be rehydrated and allowed to reassemble transitional and floating-mat vegetation. Its tightly patterned mosaic of open water, sedge, willow, peat-moss mats, and bog-hollow specialists gives the area an unusually high habitat density for its size, and its role as an otter corridor adds a landscape-level dimension to its conservation value.

The bog character of Tarbeker Moor is most expressive from late spring through early autumn, when warmer conditions bring active growth to the sedge, rush, and moss communities and when open-water surfaces and amphibian activity are easiest to observe. Late spring and early summer are particularly rewarding for visitors interested in bog vegetation, as cottongrass, beak-sedge, and flowering water plants reach their peak visibility. Early morning and evening visits in warmer months also offer the best chances for wetland-associated bird life. In winter, the muted tones of the dormant vegetation and the quiet, flooded basins give the site a more austere but still atmospheric character, with frost often accentuating the structure of the peat dams and sedge stands.