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A phytosociological analysis of 46 relevés of mesophilous colline and submontane Fagus sylvatica as well as (or) Carpinus betulus forests was conducted in Slovenian Istria. It was established that they are frequently syndynamically interrelated: in places, common hornbeam stands are merely a degradation stage on beech sites, and can be classified into the subassociation Ornithogalo pyrenaici-Fagetum fraxinetosum orni (its locus classicus is in the Goriška Brda Hills) and into the new subassociation Ornithogalo pyrenaici-Carpinetum betuli seslerietosum autumnalis. Compared with similar submontane stands from other parts of the western and southwestern Slovenia they are slightly poorer in species, with fewer diagnostic species of alliances Erythronio-Carpinion, Aremonio-Fagion and Tilio-Acerion, order Fagetalia sylvaticae and class Vaccinio-Piceetea, and with more diagnostic species of the order Quercetalia pubescenti-petraeae. Geographically, they are characterised by the taxon Helleborus odorus subsp. istriacus. Although they cover small areas these forests generate high yields and are therefore important both economically and as biotopes of protected species. Fitocenološko smo analizirali 46 popisov mezofilnih gozdov bukve in (ali) belega gabra v kolinskem in submontanskem pasu slovenske Istre. Ugotovili smo, da so med seboj pogosto sindinamsko povezani: sestoji belega gabra so ponekod le degradacijska stopnja na bukovih rastiščih, tako da jih lahko uvrstimo v subasociacijo Ornithogalo pyrenaici-Fagetum fraxinetosum orni (ki ima klasična nahajališča v Goriških Brdih) in v novo subasociacijo Ornithogalo pyrenaici-Carpinetum betuli seslerietosum autumnalis. V primerjavi s podobnimi podgorskimi sestoji iz drugih delov zahodne in jugozahodne Slovenije so vrstno nekoliko revnejši, z manjšim deležem diagnostičnih vrst zvez Erythronio-Carpinion, Aremonio-Fagion in Tilio-Acerion, reda Fagetalia sylvaticae in razreda Vaccinio-Piceetea in z večjim deležem vrst reda Quercetalia pubescenti-petraeae. Fitogeografsko jih označuje takson Helleborus odorus subsp. istriacus. Kljub majhnim površinam so ti gozdovi zaradi donosnih rastišč pomembni gospodarsko in zaradi zavarovanih vrst tudi biotopsko. |
