Article

The conservation biology is a multidisciplinary science that has developed in response to environmental changes that occurred during the last century and the need to propose effective measures ofconservation with a scientific background. It has conservation goals on the level ofpopulation, species, community and ecosystem. One of the most complex environmental problem is that ofthe plant community conservation. In order not to interrupt the evolutive processes, it is indispensable for each plant community type to maintain fragments that are in size and number sufficiently representative and that are able of self-organisation, self-regulation and selfregeneration. Unlike species, plant communities can only be conserved in situ (in their natural environment) and their preservation depends almost exclusively on the possibility of direct or indirect control by mano