The cartogramms of the species distribution within Warsaw were compared to the anthropopressure zones distinguished conventionally. Floras of individual zones differboth quantitatively and ...qualitatively. Some species are more confined to specific zones some have even an indicator value. The most interesting taxa are those found in sites where anthropopressure is the greatest.
artykuł w : Annales Universitatis Mariae Curie-Skłodowska, Sectio C, Biologia, Vol. 66 (2011), 1, s. 85-103
od Vol. 64 (2009) dostępne tylko online
streszcz. ang., pol.
tyt. równol. w jęz. pol.: ...Antropogeniczne elementy ukraińskiego krajobrazu i problem lokalnej restytucji stepów
Article in: Annales Universitatis Mariae Curie-Skłodowska, Sectio C, Biologia, Vol. 66 (2011), 1, p. 85-103
from Vol. 64 (2009) available only online
artykuł w : Annales Universitatis Mariae Curie-Skłodowska, Sectio C, Biologia, Vol. 66 (2011), 1, s. 85-103
od Vol. 64 (2009) dostępne tylko online
streszcz. ang., pol.
tyt. równol. w jęz. pol.: Antropogeniczne elementy ukraińskiego krajobrazu i problem lokalnej restytucji stepów
The aim of the present work was to study the possibility of assessing the degree of advancement of flora synanthropization process using selected floristic parameters. The application of two complex ...indices of flora synanthropization in 7 of the 11 largest cities in Poland (Bialystok, Gdansk, Katowice, Lublin, Lodz, Poznan, Warsaw) has been introduced. Each of the complex indices consists of 6 floristic parameters which take into account the proportion or the reciprocal ratios of specific groups of species. These indices were proposed on the grounds of earlier studies conducted in Warsaw concerning the flora of zones differing in anthropopressure intensity. In each of the cities mentioned above floristic studies
In each of the cities mentioned above floristic studies were carried out in selected areas of 1km2 (total of 96) within 2 zones differing in anthropopressure intensity. The results were presented in the form of property (or trait) lines. The analysis of the course of property lines showed that both complex indices differentiated relatively well, but not identically, flora of the zones studied in successive cities. It was possible to select, therefore, floristic parameters for which the differences were marked the most and which considered the largest number of cities. In conclusion, 2 three-component complex indices of flora synanthropization were proposed. It seems that they are more universal. The assessment of synanthropization process based on those indices in areas (zones) which differ in history and intensity of man’s impact does not require complete floristic lists and is possible when 3–5 experimental areas from every zone are closely studied. The size of each area (1km2 seems to be sufficient) and its geographical location is another problem
This paper reports an application of rough set theory to floristic description of downtown Warsaw. The original Warsaw - flora dataset consisting of 1181 attributes (presence/absence of vascular ...plant taxa in 225 grid squares) has been reduced to an 8-attribute subset enabling a minimal discriminant description of the inner-city (Table 1). The distribution of Diplotaxis muralis (Fig. 1) has been recognized as the attribute whose discriminating power is the highest (Table 2). This conforms to an earlier chisquare-based approach. Three taxa out of eight included in the best subset, Diplotaxis muralis, Humulus lupulus and Malva neglecta, had been considered by other authors as good indicator plants for certain urban biotopes.
An identification tree extracted from the reduced dataset has been presented (Fig. 2). The tree can be regarded as the shortest (i.e., involving minimum number of species) floristic characteristic of the downtown.
Rough sets approach has been found promising and complementary to both expert's informal appraisal and statistical methods. This makes it possible to obtain the minimum knowledge representation and enables the extraction of useful rules from the data. Conceivable drawbacks include local character of the identification rules and their susceptibility to small changes in floristic composition.
We conclude that fuzzy rough sets and rough fuzzy sets provide an especially interesting framework for geobotanical analyses. They combine coarseness of rough sets with imprecision of fuzzy approach, which would presumably eliminate the shortcomings encountered.
This paper is a continued study of flora synanthropization indices in seven of the 11 largest Polish cities (Białystok, Gdańsk, Katowice, Lublin, Poznań, Łódź, Warszawa). Material collected in ...1986–90, consists of 96 floristic lists from 1km2 sample squares lying in two anthropopressure zones:A– early populated, highly built-up inner-city,B– urban fringe with loose settlement and some green areas such as gardens and fields.
The paper presents an application and assessment of minimum spanning tree as a tool in comparative study of urban floras. Its goal is to visualize and compare resemblances between 96 analyzed areas described by:a)taxon number and five variables corresponding to particular species groups in historical-geographical classification of synanthropic plants (= raw data),b)the proportion of above-mentioned groups in the whole flora (= raw data related to local flora diversity),c)three floristic parameters constituting complex index S (= transformed data obtained as a result of an intentional reduction of information).
Each minimum spanning tree was cut in such a manner as to obtain two subtrees with the lowest number of misplaced objects.
Analysis of the three calculated dendrites (Fig. 1. a, b and c) shows that the best reflection of the city area division into two zones A and B gives the third tree, in which:–the compactness of subtree containing squares from zone A is the highest,–the number of misplaced objects is the lowest,–there are almost no subdendrites consisting of squares from the same city, so the connections between objects seem to be independent of city and author, and revealing similarity in degree of synanthropization.
Results give one more evidence of the usefulness of synanthropization indices in differentiating anthropopressure zones and show that dendrite can serve as an aid in comparing abstract spaces.
The paper aimed to determine how the percentage of neophytes in the flora reflected the intensity of anthropopressure. Within Warsaw 4 anthropopressure zones were assigned. It was checked, by ...statistical methods, that in respect of the above parameter all zones differed significantly from each other. Therefore, ist seemed justified to consider it as one of the more important indices of the flora synanthropization.
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