LIFE CYCLE AND REGENERATION NICHES OF HERBACEOUS PLANTS IN FOREST COMMUNITIES
S. A. Dubrovnaya
Kazan Federal University, Kremlyovskaya str., 18, Kazan, Republic of Tatarstan, 420008 Russian Federation
Keywords: регенерационная ниша, жизненный цикл, прорастание семян, онтогенетическая структура, Fragaria vesca, Platanthera bifolia, Trientalis europaea, regeneration niche, life cycle, seed germination, ontogenetic structure, Fragaria vesca, Platanthera bifolia, Trientalis europaea
Abstract
The criterion for steady state species in the community is the possibility of a complete turnover generation. Ontogenetic structure of Fragaria vesca and Trientalis europaea cenopopulations in phytocenoses of different seral stages of forest community depended on the ecological-coenotic conditions. Cenopopulations of species with a high frequency of individuals of generative period were formed on disturbed forest communities, however, Frsagaria vesca and Trientalis europaea seedlings in disturbed forest areas were not present. For these species, regeneration niches or microbioloby were the optimal conditions for seed germination and successful completion of the initial stages of ontogenesis, dedicated to the cenopopulations of phytocenoses climax serial stages. In holistic forest communities, species showed strategy type of patients. This allowed the species to be kept on a previously developed site. Invasive-regressive ontogenetic structure of Frsagaria vesca and Trientalis europaea cenopopulations was formed in climax stages of forest communities. However, this type of ontogenetically structure of cenopopulations reflected the survival of seedlings of species in the community, but did not represent, the tenuous state of the population. The stages of the life cycle of Fragaria vesca and Trientalis europaea were confined to different cenopopulations, where they developed the necessary conditions for the flow of the hotel stages of ontogenesis. A set of populations, within which is carried out the full turnover of the generation of Frsagaria vesca and Trientalis europaea , formed a correct idea about the status of the species in the community. In terms of a mosaic of phytocenosis cenopopulation of Platanthera bifolia was presented cenopopulations loci. The development of plants within loci differed. A variety of factors in heterogeneous pine forest determined by the separation in space of the processes of formation of seeds and survival of seedlings. This ensured the passage of the life cycle within one cenopopulations and sustainable status of the species.
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