11.5.2009: Forschung CH

Der Piz Alv im Engadin – ein Hotspot der Pflanzenvielfalt

Le Piz Alv en Engadin – un Hotspot de la diversité des plantes


Conradin Burga, Benjamin Lange, Romedi Reinalter

Vegetationsaufnahmen am Fuss des Piz Alv (2974 m) in der Bernina-Region in Graubünden haben eine extrem hohe Artenvielfalt aufgedeckt. In 30 Pflanzengesellschaften wurden auf einer Fläche von 0,32 Quadratkilometern 415 Blüten- und Farnpflanzen gezählt. Die höchste Biodiversität weisen das Geo montani-Nardetum und das Seslerio-Caricetum sempervirentis mit 179 bzw. 152 Arten auf.

Des relevés de la végétation au pied du Piz Alv (2974 m) dans la région de la Bernina aux Grisons ont dévoilé une diversité en espèces extrêmement élevée. Sur une surface de 0,32 kilomètres carrés, on a pu compter 415 plantes à fleurs et fougères appartenant à 30 associations végétales. Le Geo montani-Nardetum et le Seslerio-Caricetum sempervirentis présentent la plus grande biodiversité avec 179 et 152 espèces.


During the years 2002, 2003 and 2006, 201 vegetation records, covering 30 plant communities with a total of 415 vascular plants, were kept about an area of 0.32 km2 at the foot of the Piz Alv (2974 m a.s.l., Bernina pass, Canton of the Grisons, Switzerland). The records have been investigated regarding biodiversity (Shannon-index and evenness) and the constancy of occurrence. In addition an earlier vegetation map of Piz Alv has been revised and completed. On the lower mountain slope the dominating features are acidophilic subalpine meadows (Geo montani-Nardetum), slope peat bogs and pastures, whereas on the upper slope section, basophilic alpine meadows (Seslerio-Caricetum sempervirentis) and pioneer plant communities (Dryadetum octopetalae) prevail.
The highest biodiversity is shown by the plant communities Geo montani-Nardetum and Seslerio-Caricetum sempervirentis with 179 and 152 plant species respectively (Shannonindex 2.80 and 2.37 respectively). The highest constancy of plant species occurrence is exhibited by the basophilic alpine meadows (Seslerio-Caricetum sempervirentis), subalpine pastures (Poion alpinae), hanging bogs and alluvions. 10 species of orchids could be recorded and more than 12 additional rare plant species, found in the Swiss Red Data Book, could be recognized. The investigated locality in the Bernina pass area represents a local Swiss hot spot of plant biodiversity and should be put under nature protection.



Keywords:
Pflanzenvielfalt, Geo montani-Nardetum, Seslerio-Caricetum sempervirentis, Shannon Index, Rote Liste

Art der Publikation:
Fachpublikation

Literatur:
Burga C., Lange B., Reinalter R. (2008). Biodiversität am Piz Alv (2974 m). Lokaler hot spot in der Region Bernina (Graubünden, Schweiz). Berichte der REINHOLD-TÜXEN-GESELLSCHAFT 20, 163-178. Hannover.

Kontaktadresse:
Prof. Dr. Conradin A. Burga, Geographisches Institut der Universität Zürich, Winterthurerstr. 190 CH-8057 Zürich
conradin.burga@geo.uzh.ch
Tel: +41 (0)31 312 02 75


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