Ahlder pool

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Ahlder pool
AhlderPool1997.jpg
Ahlder Pool 1997
Geographical location Emsbüren municipality , Emsland district , Lower Saxony , Germany
Tributaries no
Drain none
Places on the shore Ahlde
Location close to the shore Schuettorf
Data
Coordinates 52 ° 20 '34 "  N , 7 ° 16' 7"  E Coordinates: 52 ° 20 '34 "  N , 7 ° 16' 7"  E
Ahlder Pool (Lower Saxony)
Ahlder pool
surface 5.5 ha
length 300 m
width 200 m

particularities

nutrient-poor shallow pond

Template: Infobox Lake / Maintenance / EVIDENCE AREA Template: Infobox Lake / Maintenance / EVIDENCE LAKE WIDTH

The Ahlder Pool is a heather pond in the Emsland district , which is of national importance thanks to the presence of the endangered water lobelia ( Lobelia dortmanna ). It was first designated as a nature reserve in 1963 ; the NSG area today has a size of around 42 ha .

location

The Ahlder Pool is located in the Ahlde peasantry belonging to the municipality of Emsbüren , 3.5 km northeast of Schüttorf not far from the motorway junction of the same name. It is bordered by meadows, pastures, fields and pine forests. The southern border of the protected area is marked by the route of the A30 . The Low German term “pool” (or Pohl) means something like puddle, puddle, pond, pond . The additional local name "Schwatte Venn" (roughly: black moor) also indicates the natural, oligotrophic boggy site conditions.

Flora

The shallow water, up to 50 cm deep, is approx. 300 m long and 200 m wide north-south and can dry out completely in phases in some summers. Its subsoil consists of nutrient-poor sand. At the edge of the pond to the stocks stretch narrow-wool grass ( Eriophorum angustifolium ) and Carex rostrata ( Carex rostrata ) from. The greatest floristic feature of the Ahlder Pool is the water lobelia, which has only a few current occurrences in Germany.

The other rare plant species include or were:

Protective and care measures

In 1968, in order to preserve the rare plant communities growing on open sand, the layer of mud from the pond bottom was removed and deposited on the bank. Then the water lobelia spread again. The originally only 10 hectare protected area was expanded over time to around 42 hectares and surrounded by a buffer zone, which is intended to prevent further eutrophication of the water. The 1963 Protection Ordinance was replaced by a new one on December 31, 2009. The nature reserve is also largely an FFH area .

Impairments and hazards

Since the construction of the A30 and A31 motorways , the once remote area has been affected by noise and pollutant emissions. To the north of the pond, an extensive industrial park is being built on the agricultural land, which, according to the latest plans, is to be expanded considerably to the south and west. In the course of this expansion, the industrial area would come right up to the northern border of the protected area and isolate it even more than before. The Ahlder Pool is already cut off from its western and southern surroundings by the two motorway routes. Furthermore, the construction work could lead to lowering of the groundwater level.

As a result of the eutrophication of the water by agriculture and road traffic, the occurrence of the water lobelia in the Ahler Pool has now probably died out (as of 2019). In addition to nutrient inputs, the extremely dry years 2018 and 2019 also contributed to the disappearance. The topsoil of the Ahlder pool should be removed to enable any seeds that may still be present on the plant to germinate. It is uncertain whether this measure will be successful.

literature

  • Carl Altehage: The Ahlder Pool in the Lingen district as an important Atlantic flora site in northwest Germany. In: Publications of the Natural Science Association Osnabrück, Vol. 28 (1957), pp. 22–32
  • F. Busche: Observations on a Heidekolk in the Emsland. Osnabrück 1949, pp. 19-21
  • Fritz Runge: The nature reserves of Westphalia and the former administrative district of Osnabrück. 4th edition, Münster 1982, pp. 2070-71

Web links

References and comments

  1. ↑ See Wolfgang Lindow: Low German Dictionary. Leer 1984, p. 151
  2. ↑ NLWKN: 4.16 silting area of ​​nutrient-poor still waters , accessed on January 4, 2013
  3. ↑ See: Environmental report on the reorganization of the regional spatial planning program 2010 (short: RROP) for the district of Emsland. Status: October 7, 2010, p. 30
  4. ↑ Species extinction: How the water lobelia disappeared in the Emsland in Neue Osnabrücker Zeitung of September 27, 2019; accessed on September 28, 2019