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EN
An unexpected and uncontrollable succession of vegetation in national parks and reserves causes the impoverishment of a gene pool of plants. This process has been observed mainly in seminatural communities and distorted natural phytocoenoses. A programme of practical endeavours should be based on a conscious management of the succession. It has to take into account the entire caryologic, ecological and sociologic variability of each species as well as to lean on a thorough study of a degree of naturalness and dynamics of the communities in which the species exist.
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EN
The intensification of agriculture has led to a distinct regress of segetal weeds, particu larly of the specialized ones. The necessity to preserve a gene pool of th is group of the species results from scientific and didactic premises as well as from practical ones. The author suggests to form a network of reserves for segetal communities on the fields of agriculture experimental stations, in the protective zones of national parks and reserves, in nature parks, and finally, in open-air museums.
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