Zbiorowiska roślinne na obszarze technicznie zrekultywowanego wyrobiska kopalni „Storkowo”
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In the area of a technically reclaimed pit of the sand and gravel „Storkowo” mine, 58 relevés were taken. The ground, which were naturally and spontanously settled by plant communities, is sandy. It is generally loose sand and slightly loamy sand of a slightly acid to alkaline reaction. The presence of CaCO3 was observed on the surfaces of some patches. Within the area of the sandy biotope, five plant communities were distinguished, four of them in the rank of an association. The Corispermo-Brometum tectorum association is the richest floristically (69 species), and it is characterised by the largest number of species in the phytosociologic relevé (on average 23 taxa) and the significant vegetation density (on average 51%). Its phytocoenoses are differentiated floristically and in the structure two variants were distinguished, typical and of aphid character and within the area of the latter, a subvariant from Hieracium pilosella. The Calamagrostietum epigeji association is characterised by smaller floristic differentiation (43 taxa) and the smallest number of species in the phytosociologic relevé (on average 14) and quite significant density of the patch surface (on average 87%). In the phytocoenoses, a typical variant was distinguished and the one of aphid character with domination of Ceratodon purpureus and Brachythecium albicans. The community of Corynephorus canescens is floristically the poorest (30 species). It is characterised by the smallest plant cover (on average 25%) and the smallest number of species in the relevé (on average14). The Holcetum lanati association is characterised by quite a significant number of species (59), large plant density (on average 91%), and the number of species in the relevé is not large (on average15 taxons). Phytocoenoses of the association were classified into three variants: a typical, with Vicia villosa and with Trifolium arvense. The Arrhenatheretum elatioris phytocoenoses are characterised by quite a significant number of species (61) and the largest density (on average 92%). Individual patches are abundant in species (on average 19 taxa were recorded in the relevé).
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