Struktura geograficzno-historyczna flory zbiorowisk upraw zbóż ozimych i kilkunastoletnich odłogów
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The paper presents the geographical and historical spectrum of agrophytocoenoses flora of winter crops cultivation and a dozen year old fallows adjacent to them, in the area of the south-western part of the Szczecin Plain. A series of anthropogenic indices were determined. 242 phytosociologic releves taken within the area of differentiated soil conditions were used in the description. The affiliation of individual taxons to the geographical and historical status was determined and then anthropogenic indices were calculated. In regard to the scope of natural character of the examined flora biotopes, the contribution of nonsynanthropic spontaneophytes (Sp) is symbolic, and the indices are very small what results from the aricultural use of biotopes. The flora of both differently exploited habitats is under strong anthropopression and this is a favourable factor for synanthropization of phytocoenoses. The values of (Sw) and (Sp) are very large and they confirm the process of restructure of the communities. A clear change is observed in the floristic character of fallows in which the contribution of apophytes increases. The process of apophyzation is confirmed by larger values of indices (Aw) and (Ap) in phytocoenoses of fallows. In segetal communities of winter crops markedly dominant are archeophytes and the (Ar) index is significantly larger than that in the flora of fallows. The influence of a human being on the communities of winter crops cultivation is also confirmed by a larger index of flora general anthropophytisation (An). The contribution of kenophytes and diaphytes is symbolic and the indices of kenophytization (Kn) and fluctuation changes in the total flora (FLC) are very small. The high indices of total flora stability (TC) confirm the stability of floristic composition of the studied phytocoenoses.
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