Struktura geograficzno-historyczna flor zróżnicowanych biotopów oraz wybrane wskaźniki antropogeniczne

The analysis of the geographical and historical structure of the flora of different biotopes and the anthropogenic indices are of cognitive significance in the process of transformation of communities. Differentiated biotopes (exploited sand and gravel pits, fallows, arable fields, warm slopes, shrubs, alleys, midfield ponds and midfield meadows, forest habitats, shoulders of forest roads and car parks adjacent to forests) in the area of the south western part of Nizina Szczecińska (Szczecin Lowland) and the western part of Pojezierze Drawskie (Drawsko Lakeland) were taken into consideration in the studies. Apart from these biotopes the results of Chmiel's studies concerning NE Wielkopolska, the protected areas: nature reserves, landscape parks, ecological utilized areas and non-protected areas were used. In the flora of the studied biotopes indigenous species dominate species of non-native origin and among spontaneophytes more abundent are synenthropic spontaneophytes (apophytes). Among anthropophytes the most frequently represented are archeophytes, whereas keneophytes occur much more rarely. The smallest transformation of the flora is observed in protected areas of NE Wielkopolska (N = 34.1%) and within the range of such biotopes as midfield ponds and midfield alleys (N = 32.9–33.3%) and in forest habitats of Western Pomerania (N = 30.8–31.8%). Within the area of exploited pits the largest indices of proper synanthropization were recorded. The Sw indices are the largest for the flora of the pits (Sw varies from 78.9 to 94.1%), approximate values of proper synanthropization were also determined for fallows and the largest - for arable fields (Sw = 91.3–98.2%). The lowest values of proper synanthropization, not exceeding 60%, were characteristic of the flora of NE Wielkopolska, of midfield ponds, midfield meadows and forest habitats (Sw indices are the lowest and they vary from 35.9 to 45.0%). The index of potential synanthropization of the flora is larger by 25–33% of the Sw value in all the biotopes. The values of proper apophytization (Apw) and potential apophytization (App) of the flora are similar in the flora of the studied biotopes to the indices of synanthropization and their values are smaller by 25–33%. The largest indices of archeophytization (Ar = 30.8−35.7%) are achieved by the flora of arable fields and fallows, slightly smaller (15.8−18.9%) − by the flora of the pits, the index of the remaining biotopes (forest habitats, shrubs, alleys, midfield ponds and midfield meadows) does not exceed 10%. The contribution of kenophytes to the flora of the studied biotopes is very slight. It is confirmed by very small indices of kenophytization.