Floodplains and side valleys

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Floodplains and side valleys

IUCN Category IV - Habitat / Species Management Area

Meadows near Harsefeld

Meadows near Harsefeld

location Southwest of Horneburg , Stade district , Lower Saxony
surface 685 ha
Identifier NSG LÜ 216
WDPA ID 162260
Geographical location 53 ° 29 '  N , 9 ° 33'  E Coordinates: 53 ° 29 '9 "  N , 9 ° 32' 46"  E
Floodplain and side valleys (Lower Saxony)
Floodplains and side valleys
Sea level from 2 m to 32 m
Setup date June 16, 1997
administration NLWKN

The floodplain and side valleys is a nature reserve in the Lower Saxony municipalities of Ahlerstedt , Bargstedt and Harsefeld in the joint municipality of Harsefeld and Bliedersdorf and Horneburg in the joint municipality of Horneburg in the Stade district .

General

The nature reserve with the sign NSG LÜ 216 is around 685  hectares . For the most part, it is also designated as the FFH area “Auetal and side valleys”, which extends over 753 hectares. In the Steinbeck valley east of Harsefeld, it borders the “ Steinbeckforst ” nature reserve . Otherwise, it's is often the conservation area surrounded "Auetal". The area has been a nature reserve since June 16, 1997. The responsible lower nature conservation authority is the district of Stade.

description

The nature reserve is located southwest of Horneburg in the Stader Geest . It stretches for around 14 kilometers along the floodplain between the river crossing through Kreisstraße  47 in the Kakerbeck district of the municipality of Ahlerstedt and the Hamburg-Harburg-Cuxhaven railway in Horneburg. It includes the course of the river Aue with its lowland and several tributaries with their valleys and valleys, including the lower course of the Doosthofgraben below Doosthof , the lower course of the Hollenbeeke below Hollenbeck , part of the Tiefenbach between Bargstedt and Ohrensen and the Steinbeck below Ruschwedel as well partially adjoining geest areas.

The nature reserve is often characterized by grassland and fallow land with sedges and reeds made of cane grass , reeds and cattails, in which the remains of softwood alluvial forests as well as small areas of bog forests and other woody structures are embedded. The floodplain and the backwaters often run close to nature with largely natural flooding, but have also been straightened on some sections. Sections of them have flooding aquatic vegetation. In addition, there are water star and simple hedgehog cob . Banks and fallow land are partially covered by moist tall herbaceous vegetation. a. Taken with real bindweed , shaggy willowherb , water dost , meadowsweet , loosestrife and loosestrife . In places, the glandular balsam has spread as a neophyte . Especially between Kakerbeck and Harsefeld, the lowland of the floodplain is partially swampy .

At the edges of the valley and in the side valleys, damp swamp forests grow in springy areas , and oak forests, oak-hornbeam forests and beech forests on drier locations . In particular, the side valleys of the Tiefenbach and Steinbeck and the area near Daudieck are also wooded.

Alder dominates the swamp forests , and ash is less common . In the herb layer settle ordinary witchweeds , Crepis paludosa , celandine , Equisetum sylvaticum , meadowsweet, Avens , bitter Schaumkraut , Opposite-Chrysosplenium , sump iris , wood cornices , angular and Carex Acutiformis and partly also Kleiner valerian , Sumpfdotterblume and Walzensegge . Here too, the glandular balsam has spread. The peat forests, which only occur in small areas, are dominated by the peat birch . In the shrub layer falter rowan and ear willow in the herb layer are small valerian, Ajuga reptans and Bach chickweed and peat moss to find.

In the oak forests which is English oak , the dominant tree species, to which beech , spruce , pine and white birch join. Rowan, buckthorn and the neophyte late bird cherry grow in the shrub layer . In the herb layer z. B. forest flutter grass , wood sorrel , ivy , two-leaved shadow flowers and lily of the valley .

Oak and hornbeam forests can be found primarily in the Steinbeck Valley and in the Daudieck area. In the Steinbeck valley, oak and hornbeam are increasingly joined by red beech, so that the forest community will develop into a beech forest community. The herb layer is u. a. by Ajuga reptans, Common witchweeds, Fetid cranesbill , Lamium Galeobdolon , Haingilbweiderich , Mercurialis perennis , sorrel, celandine , Winkelsegge and Carex sylvatica formed. The common spindle bush grows on the edge of the forest . In the Daudieck area, ash and alder grow instead of oak. In the shrub layer, the hazel dominates , in the herb layer and others settle. a. Ivy, common witchweed, chickweed , golden nettle, wood sorrel, grass clown and forest sedge.

In the beech forests the common beech dominates, in some places English oak grows tall. Wire smiths , forest honeysuckle , two-leaved shadow flowers, bracken , ivy, blackberries and raspberries settle in clear spots .

The grassland areas in the nature reserve are subject to different intensities of use, and in many cases they are also fallow. On extensively used hay meadows, z. B. Common yarrow , lady's smock , ragged robin , Lathyrus pratensis , meadow buttercup , Big sorrel , red clover and ordinary sweet vernal grass . In places, is also Bistort to find. In the area between Kakerbeck and Jitthop, the grassland is partly used intensively. An extensification of the use is sought here.

Several standing waters can be found in the nature reserve , in which u. a. the yellow pond rose settles. In the Steinbeck valley there are two still waters that have developed naturally from former clay mining waters . Spotted thousand-leaf , Berchtold dwarf pondweed , common water hose , floating star liver moss , floating pondweed , small duckweed and triple-furrowed duckweed settle in the waters . The banks are surrounded by reed zones of different widths, which are adjoined by forest.

Eel , pike , flounder , trout and various species of white fish live in the floodplain and its tributaries . Also brook and river lamprey occur. In order to ensure the passage for migratory fish and other aquatic life, the mill jams in Harsefeld and Fulling Mill were removed. Reeds are the habitat of the marsh harrier , bittern , reed bunting and various reed warbler species . Extensively used and fallow meadows offer various meadow birds , including z. B. Lapwing and Curlew , a habitat. Other bird species that occur in the nature reserve are z. B. Kingfisher , Golden Oriole , Whinchat , Feldschwirl and Red-backed shrike . The area is a feeding habitat for black and white storks and cranes . The Steinbeck is the habitat of the black woodpecker and stock dove .

There are numerous insects in the nature reserve , including various dragonflies , grasshoppers , butterflies and ground beetles . Amphibians are u. a. by crested newt , common toad , grass and tree frog , reptile by slow worm , grass snake and adder represented. The area is also the habitat of various bat species . The water shrew occurs in particular in the Steinbeck and Tiefenbach valleys. The lowland is also a suitable habitat for the otter .

The floodplain is something about from Daudieck above Horneburg tidebeeinflusst . The lowland also serves as a floodplain and flood retention area for Horneburg.

The nature reserve is crossed by Kreisstraße 77 between Bargstedt and Hollenbeck, between Bargstedt and Harsefeld by the Bremerhaven – Buxtehude railway line , in Harsefeld by Landesstraße  124 and in Horneburg by Bundesstraße 73 . The valley of the Tiefenbach is crossed by two roads, the valley of the Steinbeck by one. Otherwise traverse only isolated rural roads the reserve. In the area of ​​the nature reserve there are several hiking trails , some of which are designed as information paths . South of Horneburg there is an observation post near Postmoor on the edge of the nature reserve.

Web links

Commons : floodplains and side valleys  - collection of images, videos and audio files

Individual evidence

  1. ^ Auetal and side valleys , profiles of the Natura 2000 areas, Federal Agency for Nature Conservation . Retrieved March 15, 2018.