PL
Badania przeprowadzono w latach 2001-2003 i 2011 r. na odłogach Podlaskiego Przełomu Bugu. Zbadano 310 płatów roślinnych o powierzchni 100 m2, w 77 miejscowościach należących do 18 gmin. Wyróżniono cztery grupy wiekowe zbiorowisk wykształconych po zaprzestaniu uprawy: zbiorowiska 1-2-letnich odłogów, zbiorowiska 3-6-letnich, odłogów, zbiorowiska 7-10-letnich odłogów i zbiorowiska ponad 10-letnich odłogów. Przy klasyfikacji zbiorowisk przyjęto zasady zaproponowane przez Matuszkiewicza (2001). W zbiorowiskach roślinnych Podlaskiego Przełomu Bugu stwierdzono występowanie trzech gatunków z rodzaju Solidago L.: S. virgaurea, S. gigantea i S. canadensis. Najczęściej i najliczniej występowały osobniki Solidago virgaurea. W zbiorowiskach 1-2-letnich odłogów należących do klasy Stellarietea mediae Solidago sp. występuje rzadko. Wzrost pokrycia i liczby płatów Solidago virgaurea i Solidago gigantea nastąpił w zbiorowiskach 3-6-letnich odłogów należących do klasy Molinio-Arrtenatheretea, Koelerio-Corynephoretea i Artemisietea vulgaris. Na odłogach 7-10-let- nich i starszych wytworzyły się zbiorowiska należące do Koelerio-Corynephoretea i Molinio-ar- rtenatheretea, w ponad połowie tych fitocenoz licznie występowały osobniki Solidago virgaurea, pozostałe gatunki z rodzaju Solidago rosły bardzo rzadko.
EN
Filed studies were carried in years 2001-2003 and in 2011 in fallow lands of the Podlaski Prze¬łom Bugu mesoregion. The aim of the study was to compare the share of species of genus solidago in different communities, depending on the fallow period as well as to assess the occurrence of other species. In addition, the phytosociological characteristics of communities with presence of solidago species was presented and dominant species were identified. In total, 310 plots of agrophytocenoses from 77 localities were examined. Period of time since the cessation of cultivation was stated. The following age-groups of fallow lands were distingu¬ished: 1-2 years, 3-6 years, 7-10 years and over 10-year-old. Occurrence of three species of genus solidago (solidago virgaurea, s. gigantea, s. canadensis) in fallow lands of the Podlaski Przełom Bugu mesoregion was observed. solidago virgaurea was noted the most frequently and abundantly. Communities of 1-2-year-old fallow lands were included to the class stellarietea mediae. The share of species of genus solidago in these communities was low. solidago virgaurea was noted in 15% of them (with a little cover), whereas solidago gigantea was recorded only in 4% of plots. The sha¬re of segetal species in communities of 3-6-year-old fallow lands decreased. As a result, developing phytocenoses were mainly classified as seminatural meadow and psammophilous communities (classes Molinio-Arrhenatheretea and Koelerio-Corynephoretea) as well as ruderal phytocenoses of class artemisietea vulgaris. The share of solidago virgaurea was higher in them. The species was noted in 40% of the studied plots. solidago gigantea and S. canadensis were also observed in communities of 3-6-year-old fallow lands, however their abundance was low. In the oldest fallow lands, the increase of the role of arborescent plants was observed, especially of Pinus sylvestris and Betula pendula. The developing communities belong to the class Koelerio-Corynephoretea and Molinioarrhenatheretea. The higher share of solidago virgaurea and s. gigantea in their floristic composition was recorded. Elymus repens and Conyza canadensis were the most abundantly noted in the studied phytoce¬noses. They were noted the most frequently in 1-2-year-old fallow lands. In 3-6-year-old fallow lands in addition agrostis capillaris was very common. In the oldest ones a high cover of Betula pendula, Pinus sylvestris, Hieracium pilosella and solidago virgaurea was observed.