Efeito do sistema de plantio e da exposição solar sobre a alocação da biomassa no desenvolvimento inicial do eucalipto

Abstract

Este trabalho foi desenvolvido com o objetivo de comparar a alocação da biomassa arbórea, a conicidade do tronco e a relação altura e diâmetro ao longo do fuste de árvores de eucalipto implantadas em sistema silvipastoril, em diferente exposição solar, e em monocultivo. Os dados foram coletados em 13 árvores amostras aos 27 meses de idade, selecionadas em função do intervalo de confiança da média dos diâmetros a altura do peito (DAP) e da posição das árvores na faixa de plantio, com face de exposição sul, norte e central. Concluiu-se que na comparação com o monocultivo, as árvores plantadas em sistema silvipastoril apresentaram menor altura total, maior conicidade e maior biomassa na copa. No sistema silvipastoril, não houve efeito da posição da árvore na faixa de plantio sobre a produção total de biomassa na parte aérea, porém, árvores com face de exposição norte foram mais baixas, cônicas e produziram maior biomassa de galhos e folhas nas partes inferiores da copa.

Increment in eucalyptus diameter as affected by seasonality and production system

“…Trees in the upright position receive a large amount of light throughout the vertical extension of their crown, developing more vigorous branches from the lowest part of the stem and, consequently, a larger diameter from the lowest portion of the trunk (Martins et al, 2000). However, trees in the central position have to compete for water, light, and nutrients at rates closer to those observed for monocultures (Tonini et al, 2019a).…”

“…A lower tree density associated with positive environmental interactions, such as a greater soil fertility and moisture (Assis et al, 2015;Castro et al, 2017), for example, promotes eucalyptus growth in diameter in the CFL system, when compared with monocultures (Paula et al, 2013;Oliveira et al, 2015;Tonini et al, 2019a). However, little is known about the effects of the interaction among agricultural and pasture cultivation, silvicultural treatments, and climatic variations on tree growth in a same site.…”

Technical thinning age of eucalyptus trees grown in crop-forest integration systems

“…The artificial form factor was found by measuring the volume of medium-sized trees that were selected based on the mean square diameter. Sixteen trees were cut at 27 years of age, taking as reference the sample trees of the study of Tonini et al (2019), and other sixteen trees were cut at 48 months of age. Only medium-sized trees in the CFI system were selected based on the block, on their position in the rows, and on their exposure to the sun.…”

Microclimate and thermal comfort indices in silvopastoral systems under different planting directions and seasons

“…According to Gómez et al (2013), the mix of trees and pasture can be prejudicial or favorable, depending on factors like the tolerance of species to shading, the amount of shading provided by the trees, and the competition among plants for water and soil nutrients. The arrangement of tree rows allows for more or less light penetration, resulting in deliberate modification of the microclimate composition of silvopastoral systems (Tonini et al, 2019).…”