Nature reserve forest biotope complex Alsenberg / Schneebecke / Schlüsselsiepen
The nature reserve forest biotope complex Alsenberg / Schneebecke / Schlüsselsiepen with an area of 101.5 hectares is located northeast of Wildewiese in the urban area of Sundern and in the Hochsauerlandkreis . The area was designated as a nature reserve (NSG) by the district council of the Hochsauerlandkreis in 2019 with the Sundern landscape plan . Before that, the area was designated as part of the Sundern nature reserve from 1993 . The nature reserve Schluchtwald Müggenholl is only a few meters further south from the NSG. The NSG is surrounded by spruce forests in the Sundern nature reserve.
The NSG is mostly a deciduous forest. Spruce areas are also part of the NSG.
The landscape plan explains the NSG: “In the immediate vicinity of the snow basin valley, semi-natural deciduous forests grow on several areas, some of which are surrounded by coniferous forests. The bottom of the kerbtal valleys with the natural snow basin in sections and a nameless north-western tributary, also in sections, are included here. The same applies to the near-natural lower reaches of the snow basin just before it flows into the forest stream . At this section of the brook floodplain, a structure-rich, z. T. springy grove-black alder forest with ash trees and also interspersed spruce. The shrub and herb layer of the stand is strikingly lush. The hardwood inventory in the field of nameless flowing side stream in the west of the south-facing escarpment are an old and dead wood rich wood-rush beech forest, where oak is mixed and the forest has a selection forest and in the East by grown beech oak coppice with birch trees, which also includes the upper slope numerous spruce trees are mixed in. On the valley floor in the south of the sub-area there is a near-natural source stream section and a stream-accompanying, spring-infiltrated alder forest. A little further to the east there is an old and dead wood-rich beech-beech forest with mixed oaks on a likewise south-facing central slope. Quite centrally in the NSG, a large area of hardwood comprises predominantly old and dead wood-rich beech grove forests, to which other tree species such as sessile oaks are mixed. The largest beech population, used like a plenter forest, lies east of the valley floor, a smaller one to the north. To the north of the Schlüsselsiepen, to the west of the Alsenberg, an oak forest of strong tree wood age grows on an exposed slope to the northeast. The former coppice forest management can still be recognized primarily by the stumps. In addition to sessile and stem oak, birch and individual beech trees also appear. Many lichens grow on the tree trunks. With the exception of a few Ilex shrubs, there is no shrub layer. However, the herb layer achieves high degrees of cover despite the Hainsimsen-Buchenwald location. The existing structure stands out due to its high proportion of standing and lying dead wood. The swelling trough of the Schlüsselsiepen located above and formed as a whole is included in the determination. The same applies to the also formed original basin of the further spring siepens of the snow basin to the east, which in the further course merges into a near-natural stream section on which a stream-accompanying, spring-infiltrated alder forest is formed. To the south of the confluence of the snow basin in the forest stream lies a beech wood on the northeast slope of the Alsenberg. The beeches in the local grove beech forest, which is rich in old and dead wood, can be up to 150 years old; sessile oaks are only occasionally mixed in. The clear plenter structure enables considerable natural regeneration of beeches for each herd. "
According to the landscape plan, it was designated as:
- "Protection, conservation and development of near-natural deciduous forests and their communities through natural forest management;"
- "Protection, preservation and development of near-natural low mountain ranges (sections) as stepping stone and composite biotopes in a forest landscape dominated by coniferous forests."
- "The NSG also serves to sustainably secure habitats that are particularly worthy of protection according to § 30 BNatschG and the occurrence of rare animal and plant species."
Special forest rules
Softwood cultivation with a maximum share of 20% is still permitted on five composite areas within the NSG. Outside these composite areas with up to 20% coniferous wood, the coniferous forest areas are converted into biotope cadastre areas, spring, sieve and wet areas into hardwood areas with payment of an appropriate compensation.
- Hochsauerlandkreis: Landscape plan Sundern . Meschede 1993.
- Hochsauerlandkreis: Landscape plan Sundern - reorganization . Meschede 2019.