SUSTAINABLE ALLOWABLE CUT FOR TROPICAL FOREST MANAGEMENT

Existe uma grande lacuna dos planos de manejo de florestas tropicais com rela\ue7\ue3o \ue0 intensidade de extra\ue7\ue3o e \ue0s taxas de corte, usualmente sendo definidas de forma arbitr\ue1ria. Este trabalho visa definir intensidades de corte diferenciadas para grupos de esp\ue9cies arb\uf3reas comerciais, com diferentes ritmos de crescimento, por unidade de produ\ue7\ue3o, no estado do Amazonas. Utilizou-se o incremento peri\uf3dico anual percentual em volume, de 26 esp\ue9cies arb\uf3reas, obtido de parcelas permanentes. O incremento peri\uf3dico anual, percentual em volume, para efeito diferenciador, considerou 1% como diferen\ue7a limite. Foram identificadas tr\ueas intensidades de corte, para as classes comerciais: 24,4% (grupo I), 35,4% (grupo II) e 42,4% (grupo III). Considerando a explora\ue7\ue3o total sustent\ue1vel por hectare, para as 26 esp\ue9cies, seria de 11,5 m3ha-1 com intensidade de corte de 37%. O procedimento de c\ue1lculo \ue9 simples e pode ser utilizado pelos \uf3rg\ue3os fiscalizadores, certificadores ou legisladores como balizador do ciclo de corte e taxa de corte.There is a large gap in tropical forest management plans regarding to the intensity of logging and cutting rates. So far, it has been defined arbitrarily. This work aims at to define different cutting intensities for groups of tree species with different growth rhythm, in the state of Amazonas, Brazil. The study used the periodical annual increment, percentual in volume, of 26 species, obtained from permanent plots. The periodic increment percentage in volume for differentiating effect considered 1% difference as threshold. Three levels of logging intensity were identified for the commercial classes: 24.4% for group I, 35.4% for group II, and 42.4% for group III. The total sustainable cutting rate was 11.5m3ha-1 with cut intensity of 37%. The cutting rate calculation procedure is very simple and can be used by forest law and monitoring institutions