Naslov
Vegetation change on peat bog Ljekovačke bare, Plitvice Lakes National Park, Croatia

Autori
Hršak, Vladimir ; Šegulja Nedeljka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Istočnoalpsko-dinarsko društvo za istraživanje vegetacije ; Vzhodnoalpsko-dinarsko društvo za proučevenje vegetacije ; Ostalpin-Dinarische Gesellschaft für Vegetationskunde ; Societá Estalpino-Dinarico di Fitosociologia ; 30th Symposium

Mjesto i datum
Zagreb, Hrvatska, 04.07.2005. - 06.07.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
bogs; vegetation succession

Sažetak
Ljeskovačke Bare is a location of the best preserved peat bog vegetation in Croatia. This type of vegetation is extremely endangered in Croatia. On the regional level it is also the most endangered habitat type. Peat bogs are habitats characterised by extreme ecological conditions and populated by the specific flora and fauna which does not occur in any other habitat types. Hence, this habitat type’ s contribution to Croatia’ s biodiversity is highly valuable. That is why this type of vegetation in Croatia calls for special attention. The main cause for this situation is natural vegetation succession, i.e. the occurrence of the species that dismantle peat bog vegetation. Vegetation succession results from climate changes and the plant biomasses accumulation. In the Ljeskovačke bare area several succession stages can be identified in the peat bog. Smaller areas are covered by vegetation dominated by Drosera rotundifolia, Carex echinata, Carex panicea sa Sphagnum mahovinama. This is the most typical form of peat bog belonging to the following associations Drosero-Caricetum echinatae, Caricetum davallianae, Eriophoro-Caricetum paniceae, Molinio-Caricetum hostinianae, and Caricetum lasiocarpae. The peat bog area in the woody species habitat of Alnus glutinosa and Picea excelsa is of rather poor floristic composition. Several species of the Sphagnum genre, together with other mosses cover 100 % of the area. Other species in that area have a very low cover values. The cover values of the peat bog vegetation varies from year to year. That is most probably due to the varying humidity on the peat bog. The changes were monitored in the period between 1984 and 1990 and subsequently in 2002. The phytosociological records account for the total number of 90 species in the of this type of vegetation at Ljeskovačke bare. The vegetation changes are visible primarily in the reduced total number and cover values of bog species (Drosera rotundifolia, Menyanthes trifoliata, Carex echinata, Parnassia palustris, Carex hostiana, Valeriana dioica, Carex oederi, Eriophorum latifolium, Cirsium palustre, Equisetum hyemale, Senecio palustris, Galium uliginosum), as well as in the increased cover values of the Molinia caerulea, Agrostis canina grasses, which usually indicates the transition towards a mesotrophic level. The changes that occur in peat bog areasare not fully visible from the phytosociological records. Namely, when records were made only the areas with the best developed peat bog vegetation were selected.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA