Estratificação volumétrica por classes de estoque em uma Floresta Ombrófila Densa, no Município de Almeirim, Estado do Pará, Brasil

Abstract

5RESUMO -Este estudo teve como objetivos agrupar as Unidades de Trabalho (UT) da Unidade de Produção Anual (UPA) em classes homogêneas de estoque volumétrico e analisar a composição florística, a diversidade e as estruturas horizontal e diamétrica, por classe de estoque. Os dados procederam do inventário de prospecção, ou censo, com mapeamento de árvores pré-comerciais e potencialmente comerciais e foram disponibilizados, mediante convênio, pela Orsa Florestal. VOLUMETRIC STRATIFICATION BY STOCK CLASS IN A DENSE RAIN FOREST, CITY OF ALMEIRIM, STATE OF PARA, BRAZILABSTRACT -The objective of this study was to group the Work Units (UT) of the Annual Production Unit (UPA) into homogeneous classes of volumetric stock and to analyze the floristic composition, the diversity and the horizontal and diametric structures, by stock class. Data came from a full survey or census, with the mapping of precommercial and potentially commercial trees. These data were provided, through agreement, by Orsa Florestal. The studied area is located in the municipality of Almeirim, State of Para, Brazil. In the census, 469 UTs (250 x 400 m), totalizing 4,690 ha and 191,640 trees with DAP > 35.0 cm were evaluated. The cluster (Ward method) and discriminant (Fisher method) analyses were used and three stock classes, or productivity classes, were obtained. The richness and diversity of the arboreous species with DAP > 35.0 cm of the UPA were 540 species and 4.52 nats.individual -1 , respectively. These figures are very high but realistic because they were obtained from a census. The cutting intensity can be determined by the productive capacity of each UT and thus result in a harvest with minimum environmental impact, when compared to the maximum 1 Recebido em 28

Planejamento da exploração florestal: um estudo na amazônia brasileira

“…Em geral, pesquisas envolvendo a temática, já são realizadas a anos (BARRETO et al, 1998;GAMA et al, 2005;SOUZA, 1989), oportunizando entendimentos sobre a composição, estrutura e estratificação das florestas. Ainda recentemente, estão sendo realizados estudos que utilizam técnicas multivariadas para estratificar os estoques volumétricos (ALMEIDA et al, 2015;SILVA, 2018;Souza et al, 2014;XIMENES, 2017).…”

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