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Possibilidades para a producao sustentada de madeira em floresta densa de terra-firme da Amazonía brasileira

by Silva, J.N.M.
Series: Documentos - EMBRAPA. Centro Nacional de Pesquisas de Florestas (Brasil).Publisher: Curitiba, PR (Brasil) 1993Description: 35 p.ISSN: 0101-7691.Subject(s): PRODUCCION DE MADERA | REGENERACION NATURAL | MORTALIDAD | DIAMETRO | CRECIMIENTO | SOSTENIBILIDAD | AMAZONIA | BRASIL | WOOD PRODUCTION | NATURAL REGENERATION | MORTALITY | DIAMETER | GROWTH | SUSTAINABILITY | AMAZONIA | BRAZIL | PRODUCTION DU BOIS | REGENERATION NATURELLE | MORTALITE | DIAMETRE | CROISSANCE | DURABILITE | AMAZONIE | BRESIL In: Summary: This paper discusses the possibilities of sustained timber management in the Brazilian Amazon terra firme rain forests, based on eight-year observations of a 64 ha silvicultural experiment in the Tapajós National Forest, state of Pará, Brazil. Recurrent natural regeneration assessments according to the Malayan system revealed that logging itself was capable of inducing natural regeneration of desirable species. Stocking of commercial species raised from 41 percent before logging to 76 percent after canopy opening. Growth in DBH for all species was boosted as a result of canopy opening, but its beneficial effect did not last for too long, started declining 3-4 years after logging. Ingrowth of commercial species has fallen dramatically (nearly 60 percent) which jeopardizes sustainability. Logging, which removed 73 m3 ha exponente -1 from an average of 16 trees per ha, was considered too heavy to be sustainable if a polycycloc management system is assumed. Projection of the remnant stand over a period of 30 years (33 after logging), showed that no economic output is expected at the end of the cutting cycle. However, simulation of management regimes showed that an economic harvest would be possible if silvicultural treatments were applied and some potentially commercial species entered the market in the course of the regeneration period. A preliminary sequence of operations for a management system for the Brazilian terra firme rain forests is suggested.
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This paper discusses the possibilities of sustained timber management in the Brazilian Amazon terra firme rain forests, based on eight-year observations of a 64 ha silvicultural experiment in the Tapajós National Forest, state of Pará, Brazil. Recurrent natural regeneration assessments according to the Malayan system revealed that logging itself was capable of inducing natural regeneration of desirable species. Stocking of commercial species raised from 41 percent before logging to 76 percent after canopy opening. Growth in DBH for all species was boosted as a result of canopy opening, but its beneficial effect did not last for too long, started declining 3-4 years after logging. Ingrowth of commercial species has fallen dramatically (nearly 60 percent) which jeopardizes sustainability. Logging, which removed 73 m3 ha exponente -1 from an average of 16 trees per ha, was considered too heavy to be sustainable if a polycycloc management system is assumed. Projection of the remnant stand over a period of 30 years (33 after logging), showed that no economic output is expected at the end of the cutting cycle. However, simulation of management regimes showed that an economic harvest would be possible if silvicultural treatments were applied and some potentially commercial species entered the market in the course of the regeneration period. A preliminary sequence of operations for a management system for the Brazilian terra firme rain forests is suggested.

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