Метод двумерных и веерных диаграмм в изучении синантропности флоры

Abstract

New approaches to the study of the phenomenon of synanthropy on the example of the flora of one of the cities of the Moscow Region is discussed. We propose graphical methods for the analysis of components of urbanoflora as a part of regional flora, according to the degrees of synanthropy: non synanthropic, relatively synanthropic, facultative synanthropic, obligate synanthropic. Percentage of regional flora according degrees of synanthropy is placed on the vertical side of the two-dimensional diagram, on the horizontal side – urbanoflora are situated as a percentage of the regional flora. It is shown that urbanoflora within the regional flora forms an urban pyramid, manifested in a decrease in the proportion of representation of each group of species from obligate synanthropic through relative synanthropic to nonsynanthropic. Facultative synanthropic group presented in the regional flora and in urbanoflora by identical species is determined as the “facultative synanthrohic constant” that does not depend on the degree of urba-nization of the territory. Families with more and less synanthropic features are established. Fan diagrams which give opportunity to establish transition zones show that overlap between groups is not more than three percent. It makes evident rather high level of discretion between groups of synanthropy. With the help of fan diagrams the tendency for the intensification of synanthropization of urbanoflora due to its adaptation to anthropogenic changes in the environment can be proposed. Regional flora is more stable and less exposed to this process.