Altneckarlachen from Alsbach, Hähnlein and Bickenbach

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Altneckarlachen from Alsbach, Hähnlein and Bickenbach

IUCN Category IV - Habitat / Species Management Area

Nature reserve "Altneckarlachen von Alsbach, Hähnlein and Bickenbach". View from the meadow on Weilerhügel northwards to the Hainlache (2020)

Nature reserve "Altneckarlachen von Alsbach, Hähnlein and Bickenbach". View from the meadow on Weilerhügel northwards to the Hainlache (2020)

location Alsbach-Hähnlein and Bickenbach , Darmstadt-Dieburg district , Hesse
surface 89.24 hectares
Identifier 1432002
WDPA ID 162129
Geographical location 49 ° 45 '  N , 8 ° 35'  E Coordinates: 49 ° 45 '10 "  N , 8 ° 34' 42"  E
Old Neckar Laughs from Alsbach, Hähnlein and Bickenbach (Hesse)
Altneckarlachen from Alsbach, Hähnlein and Bickenbach
Sea level from 90.0 m to 90.6 m
Setup date August 28, 1990

The Altneckarlachen of Alsbach, Hähnlein and Bickenbach are a nature reserve in the districts of Alsbach-Hähnlein and Hähnlein (community Alsbach-Hähnlein), and Bickenbach in the district of Darmstadt-Dieburg in southern Hesse . It was designated by ordinance of August 28, 1990 and covers an area of ​​89.24 hectares.

location

The reserve is located in the Hessian Rhine Plain - Central Neckarried natural area and extends west of Bickenbach and north of Hähnlein. It consists of the areas Waldlache, Fasanenlache, Schächerlache and Hainlache as well as the elevations on the hamlet hill . The A5 runs along the north-eastern edge . The nature reserve is part of the EU bird sanctuary " Hessische Altneckarschlingen " (6217-403).

Protection purpose

A characteristic section of silted up river loops of the Altneckar is to be secured through the protection. It is a wetland predominantly on fens with rare plant species and communities. Maintenance measures should extend the existing agricultural use and develop it into permanent grassland. The existing quarry forest is to be improved through maintenance interventions.

Water management, flora and fauna

The development of the Altneckar loops is strongly influenced by the fluctuating groundwater levels in the Hessian Ried . While seasonal fluctuations predominated until the 1960s, periods of drought lasting several years were more common after that. Due to the extraction of groundwater in the reed, the silted up river arms temporarily lost their connection to the groundwater and the peaty terrain sagged by a few decimeters to 90.0–90.6 meters above sea level.

In the area of ​​the Schächerlache and Waldlache there are reed stands . With the help of a wind turbine, the areas have been wetted since 1995 in order to obtain a permanent shallow water zone with an extensive silting belt. Little grebes , bluethroats , water rails and marsh harriers breed here , as well as the little bittern , the great reed warbler and the reed warbler . The grove and pheasant pool is covered with black alder forest, extensive grassland grazed with cattle and reed beds. In the wetter years, teal , water rail and whinchat had brooded there, in the years up to 2017 only marsh harriers. Therefore, watering was recommended here in 2017 as well.

The old neckerchiefs are not only an important habitat for the bird world, amphibians such as the water frog , pond newt and natterjack toad , fish ( three-spined stickleback ) and bats ( great noctule ) also live here. 275 species of large butterflies have been identified, including numerous endangered and rare species.

geology

Occasionally the old neckar puddles are also referred to as the “Rheinrandflusslachen”. The tributary of the original Rhine consisted not only of the Alt-Neckar, but also absorbed the water of the Black Forest rivers. It flowed between the Rhine and the eastern edge of the mountains and flowed into the Rhine at Trebur until the Neckar took its current course about 8,000 years ago. The clay and clay sediments deposited in the silting up river arms led to wet soils, with high groundwater levels, peat formed, as did the nearby Pfungstädter Moor .

  • View over the ditch to the forest pool (2020)

  • Wetland in the forest pool with reeds and wind pump (2020)

  • Brook on the western edge of the pheasant pool (2020)

  • Forest of the pheasant pool with white stork nest (2020)

The Altneckar pools can be visited on a nearly six kilometer long biotope tour of the Darmstadt-Dieburg district.

See also

Individual evidence

  1. ↑ a b c d Ordinance on the "Altneckarlachen von Alsbach, Hähnlein and Bickenbach" nature reserve of August 28, 1990. (PDF) State Gazette for the State of Hesse 37/1990, p. 1858, no. 870, accessed on July 9, 2020 .
  2. ↑ a b map of the nature reserve. natureg.hessen.de, accessed on July 9, 2020 .
  3. ↑ Nature reserves in Darmstadt-Dieburg. Natural History Institute Langstadt, accessed on July 9, 2020 .
  4. ↑ Heido Gerdes: On the water balance of the old neckar pool at Hähnlein. Collurio , No. 19, pp. 37-43. 2001.
  5. ^ A b Hans-Georg Fritz: Water management and bird life in the Altneckarlachen near Alsbach-Hähnlein. Collurio , No. 19, pp. 47-55. 2001.
  6. ↑ Josef Kreuziger & Matthias Werner: SPA monitoring report for the EU bird sanctuary 6217-403 "Hessian Altneckarschlingen" (Darmstadt district). Expert opinion of the state bird sanctuary for Hesse, Rhineland-Palatinate and Saarland. Zwingenberg, 127 p. 2017. PDF
  7. ^ Mathias Ernst: The large butterfly fauna of the nature reserve "Altneckarlachen von Alsbach, Hähnlein and Bickenbach" as the basis for species monitoring. Collurio , No. 19, pp. 57-93. 2001.
  8. ^ Sand grass areas in the Darmstadt - Dieburg district. Project "Ried and Sand". NABU Kreisverband Darmstadt, accessed on July 9, 2020 .
  9. ^ Karlheinz Schneider: On the geology of the Hessian reed. Collurio , No. 19, pp. 44-46. 2001.
  10. ↑ 2. BioTopTour: Between wood and forest pools near Hähnlein (hiking tour 2009). Darmstadt-Dieburg district, 2009, accessed on August 21, 2020 .

Web links

Commons : Nature reserve Altneckarlachen von Alsbach, Hähnlein and Bickenbach  - collection of pictures, videos and audio files