11 tab. 18 ref. Sum. (En, Pt)

This work aimed to determine the floristic composition and species aggregation indexes for the natural regeneration of a tropical moist forest in Manaus region, managed under four different levels of harvesting. Silvicultural treatments presented some influences on the total number of individuals and the number of individuals per size class. The floristic composition presented with 56 different botanical families (291 different species within 169 different genera). The control plot presented the smallest number of species. The homogeneity level and Jentsch mixture quotient were very low, i.e., the studies forest is heterogeneous. The dominant families were: Burseraceae, Annonaceae, Violaceae, Melastomataceae and Rubiaceae. The families which presented the highest species diversity were: Caesalpiniaceae, Sapotaceae, Lauraceae and Mimosaceae. The Fracker & Brischle index presented higher number of clustered species in all four treatments, while the Payandeh index presented higher number of non-clustered species.