Poschfenn

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Poschfenn
Poschfenn 2.JPG
Quarry forest on the eastern foothills of the Fenn
Geographical location Germany , Brandenburg , Nuthe-Nieplitz Nature Park
Tributaries none
Drain none
Places on the shore Fresdorf , Stücken (district)
Location close to the shore Potsdam , Beelitz
Data
Coordinates 52 ° 15 '34 "  N , 13 ° 5' 1"  E Coordinates: 52 ° 15 '34 "  N , 13 ° 5' 1"  E
Poschfenn (Brandenburg)
Poschfenn
Altitude above sea level 44  m above sea level NN
surface 6.19 hectares
length Max. approx. 600 metersdep1
width Max. approx. 150 metersdep1
scope 1.585 kilometersdep1
Maximum depth 1.00 meter
Middle deep 0.70 meters

particularities

Vistula glacial flat lake west of the Saarmunder terminal moraine arc

Access forbidden (nature reserve)
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The Poschfenn is a six hectare comprehensive eutrophic shallow lake in pieces and Fresdorf , districts of Brandenburg municipality Michendorf in Potsdam-Mittelmark . It is located around 23 kilometers southwest of Berlin in the Nuthe-Nieplitz Nature Park on the western edge of the Saarmunder terminal moraine arch , an eastern branch of the Zauche .

Natural location and nature protection

The Poschfenn is located on Landesstraße 73 between the village centers of Stücken and Fresdorf on the boundaries of both places, the district boundary runs through the lake. The Fenn is located in a depression of the 61 meter high Kesselberg, which is in front of the Vistula glacial Saarmunder terminal moraine arch to the west. The depression extends through the terminal moraine to the east and opens up to the monster meadows in the Nuthe - Nieplitz lowlands, the ice age Trebbin-Potsdam drainage channel. To the west, beyond the main road, there is another lowland area, which is characterized by the marshy landscape of the Katzwinkel and the Fresdorfer See .

Although the lake is not located in the adjacent Nuthe-Nieplitz-Niederung, it is part of the Nuthe-Nieplitz-Niederung nature reserve . In addition to the stipulations of the nature reserve , the Poschfenn is particularly protected - access to the lake and its surroundings is prohibited. In addition, the Poschfenn is part of the " European bird sanctuary Nuthe-Nieplitz-Niederung " in the Natura 2000 network , which includes the Rangsdorf lake and the Nuthetal-Beelitzer Sander nature reserve beyond the valley .

Around twenty meters from the eastern foothills, the sandy European long-distance hiking trail ( E10 ), which runs from Rügen to Ulldecona in Spain, passes the Fenn, which is not visible from the path despite its proximity.

Limnology

Poschfenn

The Poschfenn covers 6.1924 hectares and has a maximum depth of one meter and an average depth of 70 centimeters. The lake is around 600 meters long and around 150 meters wide. The elongated body of water runs in a west-east direction at the foot of the southern part of the Kesselberg, whose wooded northern slope slopes steeply to the southern bank of the Fenn. The rainwater-fed Flachsee is isolated and has no drainage.

In the landscape framework plan , the district of Potsdam-Mittelmark characterized the nutrient-rich watercourse as highly polytrophic as of 2000 and indicated a weakly polytrophic condition (level IV in the trophic system ) as the natural trophy . In 2008, however, the Brandenburg State Environment Agency classified the lake as eutrophic (Trophy level III).

Flora and fauna

plants

Slope of the Kesselberg above the steep south bank

The Poschfenn has a well-developed submerged vegetation with horn leaf and milfoil . A narrow strip of reed beds , which is also wider on the north bank, surrounds the water. The steep south bank consists of mixed forest. Alder determine the eastern foothills of the bog body of water towards the teilvernässten monster meadows. The gently sloping terrain above the north bank occupies an extensive former arable area with dry grassland that is used as pasture (as of 2010 horse pasture). On their dry ruderal sites , floristic maps showed evidence of the species Taraxacum hamatiforme and Taraxacum marchicum nom. provisional from the genus of dandelion

Horse pasture (former arable land) over the north bank

In addition, the sandy, lime-poor former arable land on the slope of the Kesselberg is the location of endangered wild herbs such as barnacle spur and lamb's lettuce . Fought as weeds for decades , the plants are now on Brandenburg's Red List (level 3, endangered ), and lamb lettuce is threatened with extinction in some federal states (level 1). Because of the large proportion of the total volume, Germany has a high level of responsibility for the protection of this monotypical genus from the sunflower family . With targeted measures, the Landschafts-Förderverein Nuthe-Nieplitz-Niederung eV has endeavored since 1992 to preserve the two wild herbs, which only have a chance of survival with specially adapted land use. After the previous sheep grazing had led to declining populations, the association simulated the original field use for the first time in 1997 by harrowing partial areas. In 2005 the experimental use of the disc harrow was repeated with success.

Animals

The Poschfenn and its sandy shore zones are the habitat of various frogs and the dry grass areas of many species of bees . It is a breeding area for little grebes , various species of ducks and in spring and autumn breeding area and roosting place for resting gray geese . The ornithological working group of the landscape association carries out regular observations in the SPA area of ​​the lowlands. During the water bird census in September 2010 , the ornithologists found the following populations at the Poschfenn: two mute swans , 61  gadgets ( extremely rare according to the Red List in Brandenburg ), 22  teals ( endangered in Brandenburg ), two little grebes ( endangered in Brandenburg ) and 18  coots . According to observations made by the “Arbeitsgemeinschaft Berlin-Brandenburgischer Ornithologen” (Association of Berlin-Brandenburg Ornithologists) at NABU , crested tits and willow tits are also native to the area.

See also

literature

  • Atlas of the Geology of Brandenburg , Werner Stackebrandt and Volker Manhenke (eds.), State Office for Geosciences and Raw Materials Brandenburg (today State Office for Mining, Geology and Raw Materials Brandenburg, LBGR) 2002, 2nd edition, 142 pages, 43 maps, ISBN 3-9808157-0-6
  • Ecological characterization of the most important breeding areas for waterfowl in Brandenburg. Series of publications: Studies and conference reports of the State Environment Agency. Volume 57. Ed .: Brandenburg State Environment Agency (LUA). Potsdam 2008, ISSN  0948-0838

Web links

Commons : Poschfenn  - collection of images, videos and audio files

Individual evidence

  1. ^ A b State Office for the Environment, Health and Consumer Protection (LUGV), Brandenburg: List of lakes. As of April 3, 2012. p. 51.
  2. ↑ Olaf Juschus: The young moraine land south of Berlin - Investigations into the young quaternary landscape development between Unterspreewald and Nuthe , p. 2. Dissertation, Humboldt University Berlin, 2001. See Figure 2 plates and glacial valleys in the young moraine land south of Berlin . online Also in: Berlin Geographical Works 95 , ISBN 3-9806807-2-X , Berlin 2003
  3. ↑ Lothar Kalbe, Lothar Henschel: The European Bird Sanctuary (SPA) Nuthe-Nieplitz-Niederung . In: Nature Conservation and Landscape Management in Brandenburg - Contributions to Ecology, Nature and Water Conservation , Brandenburg State Environment Agency (Hrsg.), 14th year, double issue 3 & 4, 2005; P. 137ff, see map p. 138, Fig. 2 pdf ( memento of the original from March 18, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . @1@ 2Template: Webachiv / IABot / www.mugv.brandenburg.de
  4. ↑ Landscape framework plan Potsdam-Mittelmark. Volume 2. Inventory and evaluation. Ed .: District of Potsdam-Mittelmark, Nature Conservation Service. Belzig 2006, p. 118 pdf ( Memento of August 7, 2011 in the Internet Archive ).
  5. ↑ a b Ecological characterization of the most important breeding areas for water birds in Brandenburg. Series of publications: Studies and conference reports of the State Environment Agency. Volume 57. Ed .: Brandenburg State Environment Agency (LUA). Potsdam 2008, p. 69, ISSN  0948-0838 .
  6. ↑ a b Ornithological working group in the landscape development association Nuthe-Nieplitz-Niederung eV, The waters of the Nuthe-Nieplitz-Niederung.
  7. ↑ Ingo Uhlemann: The genus Taraxacum (Asteraceae) in eastern Germany . In: Communications on the floristic mapping of Saxony-Anhalt , special issue (2003). Edited by Botanischer Verein Sachsen-Anhalt eV, Halle (Saale) 2003, pp. 42,113, ISSN  1432-8038 ISBN 3-932795-20-2 online pdf ( Memento of the original from December 9, 2015 in the Internet Archive ) Info: The archive link was used automatically and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. . @1@ 2Template: Webachiv / IABot / www.bv-st.de
  8. ^ Rüdiger Prasse, Michael Ristow: List of wild growing vascular plants of the state of Berlin with red list. (PDF; 10.2 MB) The State Commissioner for Nature Conservation and Landscape Management / Senate Department for Urban Development (Ed.). Kulturbuch-Verlag, Berlin 2001, ISBN 3-88961-137-0 (The Berlin list also contains the data for Brandenburg).
  9. ↑ FloraWeb: endangerment status of Arnoseris minima .
  10. ↑ Ralf Schwarz, Peter Koch: Lämmersalat, Delphinium and Co. In: Land in Sicht , No. 10, 2007. Ed .: Landschafts-Förderverein Nuthe-Nieplitz-Niederung e. V., pieces and nature park administration Nuthe-Nieplitz, Dobbrikow. P. 11, ISSN  0946-6762 .
  11. ↑ Holger H. Dathe, Christoph Saure: Red list and species list of bees of the state of Brandenburg (Hymenoptera: Apidae). In: Nature Conservation and Landscape Management in Brandenburg - Articles on ecology, nature and water protection , Landesumweltamt Brandenburg (Ed.), Supplement to Issue 1, 2000, page 2 (caption on the back cover) pdf  ( page no longer available , search in web archives )  Info : The link was automatically marked as broken. Please check the link according to the instructions and then remove this notice. .@1@ 2Template: Toter Link / www.brandenburg.de  
  12. ^ Ornithological working group in the landscape development association Nuthe-Nieplitz-Niederung eV, current observations observation on September 19, 2010
  13. ^ Klaus Witt: Red list and list of breeding birds (Aves) of Berlin. ( Memento from January 23, 2013 in the Internet Archive ) (PDF; 412 kB) 2nd version, November 17, 2003. In: The State Commissioner for Nature Conservation and Landscape Management / Senate Department for Urban Development (ed.): Red Lists of Endangered Plants and Animals from Berlin. (The Berlin list also contains the data for Brandenburg).
  14. ↑ Observations of the "Working Group Berlin-Brandenburg Ornithologists" of NABU : 2002, Haubenmeise , 2004, Haubenmeise , 2004, Weidenmeise .