FFH-Gebiet Wennebeker Moor und Langwedel: Protected Landscape and Geologic Terrain Analysis

The conservation history of the site is rooted in the wider European Natura 2000 framework. An initial standard data form was completed in June 2004 by the Landesamt für Landwirtschaft, Umwelt und ländliche Räume of Schleswig-Holstein. The area was proposed as a Site of Community Importance in September 2004, confirmed at EU level in November 2007, and nationally designated as a Special Area of Conservation under Section 32 of the Federal Nature Conservation Act together with Section 23 of the Schleswig-Holstein state nature conservation act in January 2010. The data form was subsequently updated in May 2019.

The western sub-area has a longer national protection history, having been designated as the Naturschutzgebiet Wennebeker Moor und Wennebekniederung on 19 May 1988, predating the Natura 2000 designation by more than fifteen years. A management plan for the FFH sub-area Wennebeker Moor was published on 21 August 2017.

The eastern sub-area presented a more complex administrative situation because it sits within an active Bundeswehr training area. Because Natura 2000 administration is a state responsibility in Germany but the land is federally owned, an agreement was reached between the Federal Ministry of Defence and the state of Schleswig-Holstein to align the training ground function with Natura 2000 requirements. A joint set of planning documents was produced: a Naturschutzfachlicher Grundlagenteil for the military sub-area, equivalent to the standard FFH management plan, and a separate Maßnahmen-, Pflege- und Entwicklungsplan produced under federal procedure. Schleswig-Holstein also conducts FFH monitoring of the area on a six-year cycle.

Ecologically, the site is defined by the unusually broad range of Annex I habitat types compressed into 230 hectares. Priority habitat types of conservation importance include species-rich Nardetus grasslands (6230) and bog woodland (91D0). Other protected types present are nutrient-rich standing waters with pondweed or frogbit communities (3150), dystrophic standing waters (3160), flowing waters with floating aquatic vegetation (3260), wet heaths with cross-leaved heath (4010), dry heaths (4030), damp tall herb fringes (6430), transition mires and quaking bogs (7140), and Rhynchosporion peat bog hollows (7150), together with old acidophilous oak woodland on sand plains dominated by pedunculate oak (9190).

Together, only about 19 percent of the site area is covered by habitat types formally classified under the FFH directive, and dry heaths account for nearly half of that protected habitat area. The wider habitat mosaic nevertheless includes additional heath, mesic grassland, mire, swamp and riparian vegetation, conifer plantations, dry grassland, deciduous woodland, sandy open ground and standing and flowing waters, giving the site a particularly diverse habitat class composition within the state.

Hydrology is a central driver of ecological character. The Wennebek is dammed periodically during summer months to rewet sections of the lower lying land for the benefit of moor frog habitat, and a network of nine amphibian breeding ponds has been created along the Eisendorfer Graben and the southern reaches of the Wennebek. The Klostergraben and other slow-moving waters support dystrophic, nutrient-poor conditions that maintain several of the mire and bog habitat types.

The site does not have a separate species list in the source page, but wildlife interest is shaped by the wetland and heath mosaic. The hydrological management of the Wennebek and Klostergraben, including summer impoundment and the creation of nine ponds along the Eisendorfer Graben, is explicitly directed at amphibians such as the moor frog, indicating that the site is a meaningful local stronghold for amphibian fauna.

The Wennebek itself is recognised as an important fish watercourse in the broader EU Water Framework Directive context as part of the Bellerbek water body, although the loss of longitudinal connectivity through barriers such as weirs is the main obstacle to reaching a good ecological status. The combination of dystrophic ponds, transition mires, bog woodland and heath communities suggest a habitat matrix that would typically support wetland bird, dragonfly and other invertebrate communities typical of northwest German peatland and heath landscapes, even though individual species are not enumerated in the source material.

The protected area has clear and well-documented conservation significance within the European Natura 2000 network, contributing to the maintenance of favourable conservation status for several Annex I habitat types, including the priority types 6230 species-rich Nardetus grasslands and 91D0 bog woodland. Its conservation importance lies partly in the unusually high habitat type diversity for its size in Schleswig-Holstein and partly in the hydrological system that maintains the mire and bog features across the two sub-areas.

Conservation management on the western sub-area is characterised by low-intensity year-round grazing with cattle and horses, particularly on the Stiftung Naturschutz Schleswig-Holstein lands west of Landesstraße 298. In the southern lowland area only horses are used for grazing, while the heath areas in this sub-area have been cleared of encroaching scrub. The open water management of the Klostergraben supports moor frog habitat. To prevent deterioration, grazing is to be maintained in the dry heath, oak woodland and transition mire areas in the northwest, with scheduled scrub clearance and mowing, and the western edge near the Eisendorfer Graben must be cleared and mown to maintain dry heath where grazing is not feasible. Bathing, diving and boating are prohibited on the Wennebek by nature conservation ordinance.

In the eastern sub-area, the 2009 baseline mapping was repeated in 2017 and showed an overall deterioration in the conservation status of nearly all habitat types, with nearly a quarter of FFH habitat area losing condition since 2009. This is most evident in dry heaths affected by ageing stands and progressive scrub encroachment, with some areas developing into woodland. The Maßnahmen-, Pflege- und Entwicklungsplan prepared by the federal military infrastructure office addresses these dynamics through a series of one-off and periodic management measures. The site is also part of the Naturpark Westensee and lies along the protected Fuhlenau and Mühlenau tunnel valley geotope, broadening its conservation framing beyond the Natura 2000 designation alone.

FFH-Gebiet Wennebeker Moor und Langwedel is notable for an unusually high concentration of Annex I habitats within a single Natura 2000 site, spanning wet and dry heaths, transition mires, bog woodland, dystrophic ponds and a meandering lowland stream. The site demonstrates how European nature conservation obligations can be integrated with unusual land uses, with the eastern sub-area doubling as a working Bundeswehr training ground under a formal federal-state agreement.

It also illustrates the layered nature of German protected-area governance, sitting within the Naturpark Westensee, encompassing the older 1988 Naturschutzgebiet Wennebeker Moor und Wennebekniederung, and aligning with the protected Fuhlenau and Mühlenau tunnel valley geotope, a Pleistocene geological feature that gives the modern mire landscape its underlying shape.