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Few data have been published on the developing phytocenoses in the monocultures of shrub energy willows. It is possible that this study has described for the first time and in greater detail the floristic-phytosociological and ecological structure of the type of communities in question with an example of monocultures with Salix cordata ‘Americana’ Hort. and with S. viminalis L. The studies were conducted in the left-bank valley of the Lower San river, in the vicinity of Rudnik and Sarzyna (Fig. 1). These plantations were established on very similar alluvial soils, on arable fields, meadows, and pastures (Tables 1–6). In general, monocultures with Salix cordata ‘Americana’ are established on a somewhat wetter substratum than plantations with Salix viminalis. Moreover, plantations of the former yield a volume of biomass more often than plantations of the latter. Probably because of the foregoing reasons, the farms with S. cordata ‘Americana’ are characterized on average, inter alia, by a more varied floral composition than plantations with S. viminalis. Mainly for those reasons, the phytocenoses of monocultures of the two willow species were classified as belonging to separate, main groups of communities: with S. cordata, Americana’ and with S. viminalis. Floristic-phytosociological similarities and differences between the identified community groups are highly complex. Above all, they are floristically very heterogeneous phytocenoses (Table 7). In both the main groups of these phytocenoses, worth noting are three similar subgroups of communities termed as segetal and meadow, ruderal, and underdeveloped (non-typical). The first two represent 10.2478/v10067-008-0002-5

annales universitatis mariae curie-skłodowska. sectio c, biologia

The phytosociological structure of monocultures of shrub willows with Salix cordata ‘Americana’ Hort., and with S. viminalis L. in the vicinity of Rudnik and Sarzyna (The Lower San River valley)