Abstract
In the present paper the authors are undertaking to show the correlation that exists, between the age, density of the trees and the coefficient of aggregation of a population of pines studied in the Lucs bogs-reservation of the Harghita Mountains (Rumania). The pines which have been studied are relics and a number of arctic elements (Sparganium minimum, Potamogeton alpinus, Betula nana) had survived with them. A geobotanical survey showed that the micro-distribution of the pine population presents, in spite of the uniformity of the ecological and phytosociological conditions, fluctuations of density as well as of aggregation which thus reflect the existence of some intense phytosociological processes in the apparently stationary structure of the trees. The coefficient of aggregation of the population under study has been determined by the Hopkins-method, based on some linear measurements carried out between the points determined at random (by chance) and the nearest vegetal individuals as well as between pairs of individuals chosen at random.
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