XVI International Botanical Congess

The analysis of the populations of Crocus heuffelianus, Fritillaria meleagris, Galanthus elwesii, G. nivalis, Gymnospermium odessanum show the qualitative differences in their age structure depending on the level of antropic influence into habitats. In inviolable and feebly violable habitats in lowland forests of Ukraine the populations with homeostatic age structure are predominate. The felling, forest planting and draining bring out for profound change of the age structure and to degradation of populations. However, some spring geophytes (Fritillaria meleagris, Gymnospermium odessanum) have a characteristics to invasion in secondary habitats and to form the populations with homeostatic age structure.