[Adventive component of flora of Eastern part of Belarus]
2008
Dubovik, D.V., National Academy of Sciences, Minsk (Belarus). The V.F. Kuprevich Institute of Experimental Botany
The adventive component of flora of the water - collecting area of the Sozh river and left - bank part of the Dnepr river in the Eastern part of Belarus was studied. The composition of the following adventive components was studied: xenophytes (adventive types which occurred in the studied region incidentally) and ergasiophytes (introduced species) which were sub-divided into ergasioliptophytes (without tendency to naturalization) and ergasiophigoptophytes (with tendency to naturalization). In course of the flora investigation there were revealed 1997 taxons vascular plants, 1049 taxons belonging to the indigenous fractions and 948 taxons belonging to the adventive fractions. The adventive flora fraction was more than 46% again the total number of species. The historical review of the process of flora of the studied region enrichment with xenophytes since 1850 was presented. The analysis of the adventive flora fraction according to the species resistance rate in phytocenosis, character of their origin and migration period was realized. The realized analysis proved the complicated character of origin and establishment of adventive species, the uneven character of migration for the various groups of plants especially in the second half the nineteenth and twentieth centuries
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