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Braz E.M.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Schneider P.R.,Federal University of Santa Maria | de Mattos P.P.,Pesquisadora da Embrapa Florestas | Thaines F.,TECMAN Tecnologia e Manejo Florestal | And 3 more authors.
Ciencia Florestal | Year: 2012

The increment of a tropical forest under logging depends not only on the growth rate but also on the residual diameter structure of the forest. It was estimated the residual diametric structure to guarantee the necessary increment to recover the logged timber volume in a compartment of tropical forest in the state of Amazonas, in Brazil. The simulation of forest growth rate calculated after cutting when observing calculated tax and structure resulted in an increment that can recover the initial commercial volume during the cycle under consideration. It was observed in simulations that if the total commercial volume is removed in the beginning of the first logging cycle the forest will not recover the timber volume under the cycle in question. It was observed that approximately 81 % of the increment that is necessary to recover the volume logged was originated in the commercial residual classes (above 45 cm of diameter center class). It was identified an optimal class of diameter to be kept in the forest, above which the timber volume return is null. The most important to be considered in the volume recover is the increment potential of the forest structure that must remain in the compartment. Source


Braz E.M.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Schneider P.R.,Federal University of Santa Maria | de Mattos P.P.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Selle G.L.,Federal University of Santa Maria | And 3 more authors.
Ciencia Florestal | Year: 2012

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 11.5m 3ha -1 with cut intensity of 37%. The cutting rate calculation procedure is very simple and can be used by forest law and monitoring institutions. Source


Braz E.M.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuaria | Thaines F.,TECMAN Tecnologia e Manejo Florestal | de Mattos P.P.,Caixa Postal 319 | Oliveira L.C.,Embrapa Acre | And 3 more authors.
Ciencia Florestal | Year: 2014

This work has as its objectives: a) to assess the geographical distribution and population structure of Amburana cearensis var. acreana; b) to calculate sustainable cutting rates, according to stipulated cutting cycles, and c) to simulate the projected recovery potential in volume based on the calculated cutting rate. It was used data from sustainable forest management plans, and the results will contribute for future decisions about its endangered condition. The results did not corroborate the information that Amburana cearensis var. acreana is endangered in Acre state. However the management sustainability will only be feasible if considered the ideal remaining population structure and the estimative of the optimal cutting rate according to the cutting cycle. Source

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