U članku su prikazani rezultati fitocenoloških istraživanja i analize šumskih sastojina bijele johe (Alnus incana /L./ Moench subsp. incana) u Hrvatskoj. Na temelju 11 novih i 37 fitocenoloških snimaka iz prijašnjih istraživanja analizirane su sastojine iz Gorskoga kotara uz rijeku Kupu i njezine pritoke opisane u okviru asocijacije Lamio orvalae-Alnetum incanae Dakskobler 2010 te sastojine iz sjeverozapadne Hrvatske uz rijeku Dravu definirane kao Equiseto hyemali-Alnetum incanae Moor 1958. U radu se analizira njihov međusobni odnos, a opširnije florni sastav i dinamika promjena u sastojini bijele johe sa zimskom preslicom u sjeverozapadnoj Hrvatskoj.

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Phytocoenological traits of forests of sessile oak in the area of Zrinska Gora were investigated in 2009. Phytocoenological research was conducted using a method of the Zürich-Montpellier School. A comparison was made with acido-thermophilic forests of sessile oak from central and north-western Croatia, then from Slovenia and the Mescek Mountains in Hungary.A statistical comparison was made by entering all the phytocoenological relevés into the Turboveg database. This was followed by a classical synthetic analysis of the phytocoenological relevés and a multivariate analysis using Syntax 2000 software. Average Ellenberg's values were calculated for each relevé with JUICE 6.3 software.Taking into consideration all the facts, it can be concluded that the newly established association Potentillo micranthae-Quercetum petraeae shows a high degree of independence and differentiation from other similar associations described to date. In relation to others, it is poorer in species, both in terms of the systematic categories to which it belongs and the number of elements from the orders of Fagetalia and Quercetalia pubescentis. Of the species occurring in acidophilic forests of sessile oak, Genista tinctoria, Chamaecytisus hirsutus and Dicranella heteromalla can be considered characteristic species, whereas Galium sylvaticum, Cephalanthera longifolia, Dianthus armeria and Viola alba can be termed differentiating species. The species Potentilla micrantha, Festuca drymeia and Luzula forsteri are very important for the structure, physiognomy and syndynamics of the association.It is subordinated to the alliance Quercion robori-petraeae, the order Quercetalia robori-petraeae and the class Querco-Fagetea.

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/ Joso Vukelić, Ivan Pilaš, Dario Baričević, Jasnica Medak, Irena Šapić