University of Zagreb. Faculty of Science. Department of Biology.
Abstract
Botaničko-geografski rezervat „Đurđevački pijesci“ nalaze se između Đurđevca i Kalinovca, a zauzima 19,5 ha. U rezervatu su provedena terenska istraživanja tijekom 2016. i 2017. godine, te je zabilježeno 126 svojti među kojima su najzastupljenije porodice Poaceae, Asteraceae, Caryophyllaceae, Cichoriaceae, Rosaceae i Fabaceae. Analizom životnih oblika utvrđeno je da dominiraju hemikriptofiti, no visoki udio imaju i fanerofiti, što ukazuje da je rezervat u procesu sukcesije. Osim spektra životnih oblika na potiskivanje pješčarske vegetacije ukazuju, preko ekoloških indeksa, i promjena pH i vlažnosti tla što dovodi do naseljavanja korovnih, invazivnih i nepješčasrkih vrsta. Da bi se spriječilo potiskivanje pješčarske vegetacije potrebne su hitne mjere zaštite za očuvanjem rezervata.The Special Geographical and Botanical Reserve „Đurđevački pijesci“ (Sands of Đurđevac), with an area of 19.5 ha, is situated between the towns of Đurđevac and Kalinovac. Through field research conducted in the reserve during 2016 and 2017, 126 taxa were recorded, with the families Poaceae, Asteraceae, Caryophyllaceae, Cichoriaceae, Rosaceae and Fabaceae being the most prevalent. The life forms analyses showed that hemicryptophytes are dominant, but that phanerophytes are also significantly present, which indicates that the reserve is experiencing vegetation succession. Along with spectar of life forms, the disappearance of sand vegetation is is visible through ecological indices. This is evident through the change in the soil reaction (pH value) and soil moisture, which leads to colonization by weed, invasive and non-psamophytic taxa. Immediate protection measures are required to stop the suppression of sand vegetation, and preserve the Botanical Reserve
