Abstract
The research on the localities of <i>Avena strigosa</i> and on its increased occurrence in agricultural crops of the Podlaski Przełom Bugu was carried out in 1994-1998. The documentation of this research consists of 600 phytosociological relevés and the floristic records. The paper presents the composition and structure of the field plant communities where <i>Avena strigosa</i> was found. It occurs frequently on various soil types of the Podlaski Przełom Bugu. However, on the area examined it was found just in small numbers, covering up to 5% of the area, while in the eastern part of the area an increase in its occurrence was observed. In the area of the Podlaski Przełom Bugu <i>Avena strigosa</i> occurred in spring cereals in the communities of <i>Arnoserido</i>-<i>Scleranthetum</i> and <i>Vicietum tetraspermae</i> as well as in the poor field communities, with the character species of <i>Aperion spicae</i>-<i>venti</i> and <i>Panico</i>-<i>Setarion</i>. Additionally, <i>Avena strigosa</i> was also found in the field communities of root crops belonging to <i>Panico</i>-<i>Setarion</i> alliance; however, it was present there just in small numbers.
Highlights
The documentation of this research consists of 600 phytosociological relevés and the floristic records
In the area of the Podlaski Prze3om Bugu Avena strigosa occurred in spring cereals in the communities of Arnoserido-Scleranthetum and Vicietum tetraspermae as well as in the poor field communities, with the character species of Aperion spicae-venti and Panico-Setarion
Avena strigosa was found in the field communities of root crops belonging to Panico-Setarion alliance; it was present there just in small numbers
Summary
Podlaski Prze3om Bugu le¿y na styku województw: mazowieckiego, podlaskiego i lubelskiego. W podziale geobotanicznym Polski (SzaferiPaw 3 owski , 1977) znajduje siê w Dziale Ba3tyckim, w Pasie Wielkich Dolin i Krainie Podlaskiej. Jest to obszar rolniczy o powierzchni 670 km, o wyj1tkowych walorach przyrodniczych i krajobrazowych. Gospodarstwa tego terenu s1 silnie rozdrobnione (najwiêcej jest gospodarstw ma3ych o powierzchni do 5 ha, gospodarstw du¿ych, powy¿ej 50 ha jest tylko 8) i prowadzone metodami tradycyjnymi. Podlaski Prze3om Bugu zgodnie z podzia3em Wo s i a (1999) nale¿y do Regionu Podlasko-Poleskiego. Jest to obszar o niewielkich opadach, œrednia za wielolecie wynosi3a 478 mm, a w okresie badañ by3a wy¿sza i wynosi3a 546 mm. Œrednia roczna temperatura za wielolecie, jak równie¿ w okresie prowadzenia badañ wynosi3a oko3o 8oC. Okres wegetacyjny na badanym terenie rozpoczyna siê od pierwszej dekady kwietnia i trwa do koñca paŸdziernika, œrednio 208 dni
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