Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/38164
Title: Long-term effects of plant spacing on the growth and morphometry of bertholletia excelsa
Other Titles: Efeitos de longo prazo do espaçamento de plantio no crescimento e morfometria de bertholletia excelsa
Authors: Ferreira, Marciel José
Lima, Roberval Monteiro Bezerra de
Santos, Victor Alexandre Hardt Ferreira dos
Souza, Alex Soares de
Oliveira, Rafael Gonçalves de
Keywords: Growth
Silviculture
Issue Date: 2021
metadata.dc.publisher.journal: Acta Amazonica
metadata.dc.relation.ispartof: Volume 51; Edição 3; Número 181 - 190.
Abstract: Plant spacing is a potential driver of tree form and yield in forest plantations. However, its effects on the productivity of tree plantations in the Amazon are still little known. This study examined the effects of six spacing regimes (3 x 4, 4 x 4, 4 x 5, 5 x 5, 5 x 6, and 6 x 6 m) on the growth and morphometry of a 20-year-old plantation of Bertholletia excelsa. We observed high, spacing-independent survival (> 70%). For timber production purposes, intermediate and two large spacing regimes tended to higher values of yield components, mainly diameter, biomass, and volume, although some did not differ significantly from the smallest spacing. One of the intermediate spacings (5 x 5 m) tended to higher commercial height. Tree crowns tended to be wider and longer in the larger spacings, which indicates the potential of these regimes for fruit production. Tree crowns exceeded the vital growth space in all spacing regimes, which suggests the need for thinning before the age of 20 years in all spacings to reduce intraspecific competition and increase yield. We estimated that a density of 84 remaining trees per hectare would be necessary to reach an average diameter of 40 cm at the age of 20 years. Thus, B. excelsa had high survival in the tested range of spacing regimes, while the intermediate and the largest spacing regimes led to better tree growth and morphometry. © 2021, Instituto Nacional de Pesquisas da Amazonia. All rights reserved.
metadata.dc.identifier.doi: 10.1590/1809-4392202003611
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