In 2013 and 2018, the occurrence of alien Dittrichia graveolens was confirmed within 126 road sections (1-kilometre) of the A4 highway in the Lower Silesian Province and Silesian Province, south-western Poland. During five years the increase in abundance has been recorded within 50 sections (52.1%), a decrease within 11 sections (11.5%), whereas within 35 sections (36.5%) it remained unchanged. New data suggest that D. graveolens is fully established in the Polish flora, and it should be classified as a potentially invasive species.
Background and aims European farmland has been abandoned at an unprecedented rate over the last few decades, resulting in an increase of the area of fallows and a decrease in plant diversity in meadows. This work was aimed at determining whether differences in the persistence and plant diversity of the two ecosystem types, similar in plant biomass and geographical location, resulted in changes in soil physicochemical properties. Methods Soil physicochemical properties and floristic composition were studied in six fallows at the initial stage of secondary succession and six fresh meadows with high plant diversity.Results Fallow soils had several-fold higher content of available phosphorus, potassium and nitrates. Meadow soils had a slightly higher C:N ratio and water-holding capacity (WHC), what suggest more humus in meadow soil. Conclusions The main differences in soil properties between meadows and fallows were after-effects of agricultural management, most probably previous fertilization. The difference in the C:N ratio and WHC can be attributed to ecosystem ages. Abandoned farmlands had relatively good nutrient supply but low species diversity. Meadows, though depleted in available nutrients, showed high floristic richness. The legumes, which were more abundant in meadows, might have supplemented this ecosystem with the limiting N.
The paper presents the taxonomical position and the description of the characteristic features of Macrosciadium alatum (=Ligusticum alatum). The species was recorded in the Western Bieszczady Mts (the northern part of the Carpathians) in July 2007 and is new to the flora of Europe. Its natural range comprises mainly the Caucasus region and the origin of M. alatum in south-east Poland is quite puzzling. The species has most likely been deliberatelly brought into the area. M. alatum spreads quite intensively. It penetrates semi-natural vegetation systems and seems to be expansive
we also present the information concerning all known localities of the species in Poland and its distribution map. Data on the ecology, distribution and status of O. asterosperma in europe, and some structural aspects of basidiocarps and spores, are also summarized.
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