engleski

The importance of preserving the torrent streams of the Rječina River catchment for maintaining the biodiversity of grasslands on Grobnik Polje

The mountains in the hinterland of the Rijeka Bay are characterized by significant biological diversity. Several torrents flow from the mountains towards Grobnik Polje. Reaching the foothills, they unite in the torrent Sušica and flow towards the Rječina stream. Incised into the glaciofluvial deposits of Grobnik Polje, torrent beds are subject to constant changes. Exploring the flora and vegetation in the area of Grobnik Polje (Grobničko polje), we are concluded that bio-corridors along torrent beds had and probably still have a significant role in creations of botanical composition of the surrounding vegetation. This is mostly related to the enrichment of flora and the formation of a specific composition of grassland vegetation. The aim of this study is to determine the botanical composition of grasslands along torrent beds on Grobnik Polje. Floristic and vegetation research was conducted using standard Central European methods. Floristic lists with a dozen of sites from deposits in torrent beds, torrent slopes, and on surrounding grasslands are recorded in the Flora Croatica Database (FCD). Among the most interesting results we highlight the finding of endemic and rare Natura 2000 species Genista holopetala (W. D. J. Koch) Bald., as well as grasslands of narrow – leaved moor grass (Sesleria tenuifolia Schrad.) which unite the most floristic rarities. Due to recent hydrotechnical interventions in torrent beds and due to the process of urbanization, the specific endemic flora and vegetation are endangered, so there is a need to preserve the naturalness of torrent streams.

torrent streams ; Grobnik Polje ; bio-corridors ; Genista holopetala ; grasslands of Sesleria tenuifolia

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