Evaluating potential timber species at the Tapajos National Forest in Para state, Brazil, 28 years after logging Avaliação do potencial madeireiro na Floresta Nacional do Tapajós após 28 anos da exploração florestal

The stock of timber species was evaluated in a 64 ha experimental area 28 years after logging. The study was carried out in the Tapajos National Forest, state of Para, Brazilian Amazon. The study area was logged in 1979 and tree species were measured from 1981 to 2007 in 36 permanent sample plots. I...

Full description

Saved in:
Bibliographic Details
Published inPesquisa Florestal Brasileira Vol. 30; no. 64
Main Authors Leonardo Pequeno Reis, Ademir Roberto Ruschel, Amanda Alves Coelho, Adriana Santos da Luz, Regina Célia Viana Martins-da-Silva
Format Journal Article
LanguageEnglish
Published Embrapa Florestas 01.12.2010
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:The stock of timber species was evaluated in a 64 ha experimental area 28 years after logging. The study was carried out in the Tapajos National Forest, state of Para, Brazilian Amazon. The study area was logged in 1979 and tree species were measured from 1981 to 2007 in 36 permanent sample plots. In 2007 tree species were classified in three groups: commercial timber (MC); potentially commercial timber (MP); non-commercial timber (MS). During that period all trees with DBH>5cm were measured. In 2007, 28 years after logging 9,859 trees from 239 species were recorded. Considering the species groups 35.5% belong to MC, and from these only 53% are available for harvesting, representing a timber volume of 75.5m3 ha-1. In 2007 some species as Carapa guianensis and Virola michelii had higher timber volume than before logging but other species as Astronium lecointei and Manilkara huberi had timber volume lower in 2007. In the end of the studing period, 28 years after logging, the timber volume was recovered but the harvested species did not recuperated their original basal area. Even with the high intensity of harvest occurred in the area but considering the timber volume in 2007 of those species that were not harvested in 1979, a second cutting mainly for those species could be admissible now. doi: 10.4336/2010.pfb.30.64.265 A pesquisa foi conduzida em uma área experimental de 64 ha, localizada na Floresta Nacional do Tapajós, PA, Brasil. A área foi explorada em 1979 e monitorada por meio de 36 parcelas permanentes (9 ha). Com base nos dados da última medição, em 2007, as espécies foram classificadas em três categorias: arbóreas com valor comercial madeireiro (MC); com potencial comercial, sem reconhecido/consolidado valor de mercado madeireiro (MP); e espécies arbóreas sem valor comercial/industrial madeireiro (MS). Após 28  anos da exploração, foram registrados 9.859 indivíduos, com DAP ≥ 5 cm, distribuídos em 239 espécies. Nas três categorias representadas, 35,5% foram MC. Desse total, somente 53% apresentaram-se aptas para exploração, somando um volume de 75,5 m3 ha-1. Observou-se que algumas espécies  madeireiras foram favorecidas pela exploração em densidade e volume, como Carapa guianensis e Virola michelii , mas outras obtiveram o balanço negativo na maioria das espécies exploradas, destacando-se as espécies Astronium lecointei e Manilkara huberi . Por final, observou-se que a biomassa florestal foi recuperada, porém as espécies exploradas continuamcom balanço negativo. Conclui-se que o primeiro ciclo de corte é possível, principalmente devido ao estoque dominante de espécies não exploradas na primeira colheita. doi: 10.4336/2010.pfb.30.64.265
ISSN:1809-3647
1983-2605
DOI:10.4336/2012.pfb.64.265