Dinâmica da população de Protium polybotryum (Turcz.) Engl. durante três anos após exploração florestal seletiva em uma floresta tropical de terra firme.

Abstract

This work aimed to enlarge the knowledge regarding to the dynamics of the population of Vrotium polyhotryum (turcz.) Engl. in a terra-firme tropical forest in gaps caused by selective logging in the Experimental Station of the Embrapa Amazônia Oriental, Km 30 of the PA 150 road in the district of Moju, State of Pará. The survey were done on two sampling leveis: levei I, individuais with dbh small than 5cm; and levei II, individuais with dbh larger or equal to 5cm, which were measured in plots of 2cm x 2cm and lOcm x 50cm, respectively. After the first survey in june 1998, data measurements were made every three months up to june 2001. The results of this work were divided in two approaches: levei I, the individuais were evaluated according to the Natural Regeneration Rate (TR), wich is represented by the equation TR = [(A |-Ao)/(Ai+Ao)]xlOO were, A o = absolute abundance in the beginning of the period, Ai = absolute abundance in the end of the period, during a three-year period. It could be observed that this species regenerated at any place or invironment in the gap. It does not depend on sunlight to develop, but it benefíts from light to grow. So, it can be conduded that Protium polyboíryum (turcz.) Engl. does not need gap condition to regenerate and grow up. The second approach was on diameter growth of individuais that compose the levei II where, it can be verified that there was an annual average diameter increment of 0,23cm for the population of Protium polyboíryum (turcz.) Engl., during a three-year period.