Determinação do volume de madeira em povoamento de eucalipto por escâner a laser aerotransportado

Oliveira, Luciano Teixeira de; Ferreira, Maria Zélia; Carvalho, Luís Marcelo Tavares de; Filho, Antônio Carlos Ferraz; Oliveira, Thomaz; Silveira, Eduarda Martiniano de Oliveira; Acerbí, Fausto Weimar

doi:10.1590/s0100-204x2014000900005

Cited by 13 publications

(18 citation statements)

References 19 publications

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“…Os dados de altura, DAP e volume obtidos pelo MGO das árvores foram submetidos à análise de variância a 5% de probabilidade e os dados de alturas e DAP foram comparados mediante superposição das barras do erro-padrão da média de cada tratamento (OLIVEIRA et al, 2014).…”

Section: Ima = V/t [1]unclassified

Crescimento Inicial De Eucalipto E Acácia, Em Diferentes Arranjos De Integração Lavoura-Pecuária-Floresta

Oliveira

Cabacinha

Santos

et al. 2015

CERNE

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na integração lavoura-pecuária-floresta e duas testemunhas em monocultivo (eucalipto e acácia). A altura das árvores de eucalipto é influenciada pelo consórcio com acácia nos arranjos estudados na ILPF, o que não acontece com o diâmetro à altura do peito. O arranjo das espécies de eucalipto e acácia consorciados na mesma linha de plantio possui produtividade igual ao arranjo, utilizando apenas eucalipto nas linhas de plantio em sistemas de ILPF. A produtividade de madeira de eucalipto no arranjo de eucalipto e acácia na mesma linha da ILPF é menor do que em cultivo sozinho na linha, porém, a soma da madeira produzida pelas duas espécies é superior ao arranjo de apenas eucalipto na linha de plantio da ILPF. PRODUCTIVE BEHAVIOR OF EUCALYPTUS AND ACACIA, IN DIFFERENT ARRANGEMENTS OF CROP-LIVESTOCK-FOREST INTEGRATION ABSTRACT:The objective was to evaluate initial growth of clonal Eucalyptus, hybrid Eucalyptus grandis x E. urophylla and Acacia (Acacia mangium) trees in alternate and not alternate rows of trees, intercropped with forage (crop-livestock-forest integration -CLFI) and monoculture. The design was a randomized complete block design with four replications, three arboreal arrangements consisting of eucalyptus, acacia + eucalyptus, acacia, all planted in crop-livestock-forest integration and two monoculture controls (Eucalyptus and Acacia). The height of eucalyptus trees is influenced by the consortium with Acacia in the studied CLFI designs, which does not happen with the diameter at breast height. The arrangement of species of eucalyptus and acacia intercropping in the same row planting has productivity equal to the array using only the lines of eucalyptus planting systems . Timber productivity of acacia and eucalyptus in the same row is less than the same species line, however, the sum of the timber produced from the two species is greater than the arrangement of eucalyptus only row in CLFI.

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Section: Ima = V/t [1]unclassified

Crescimento Inicial De Eucalipto E Acácia, Em Diferentes Arranjos De Integração Lavoura-Pecuária-Floresta

Oliveira

Cabacinha

Santos

et al. 2015

CERNE

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“…In Brazil, the fact that eucalyptus plantations are mainly destined for pulping or energy purposes, as well as the fast growth conditions of the country, means that the applicability of the proposed models is limited to young plantations (around 7 years or less) grown in high densities (around 1,111 trees per hectare). For instance, the following works all present height-diameter models for eucalyptus grown in Brazil using data from stands ages 8 years and younger: Ribeiro et al, 2010;Thiersch et al 2013;Miranda et al, 2014;Oliveira et al 2014;Mendonça et al, 2015;Souza et al, 2016. While there are some exceptions of studies dealing with older plantations (Azevedo et al, 2011;Oliveira et al, 2015) these are generally from small plantations that have not received active management operations (such as thinning or fertilization).…”

Section: Introductionmentioning

confidence: 99%

HEIGHT-DIAMETER MODELS FOR Eucalyptus sp. PLANTATIONS IN BRAZIL

Filho

Mola‐Yudego

Ribeiro

et al. 2018

CERNE

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HEIGHT-DIAMETER MODELS FOR Eucalyptus sp. PLANTATIONS IN BRAZILFERRAZ FILHO, A. C.; MOLA-YUDEGO, B.; RIBEIRO, A.; SCOLFORO, J. R. S.; LOOS, R. A.; SCOLFORO, H. F. Height-diameter models for Eucalyptus sp. plantations in Brazil. CERNE, v. 24, n. 1, p. 9-17, 2018. HIGHLIGHTSHeight-diameter models are provided for eucalyptus plantations in Brazil.A wide variety of stand conditions (age and tree densities) were covered in the database.Mixed modeling was used due to the hierarchical structure of the data (trees in plots).The models use diameter, age, and dominant height as predictor variables. ABSTRACTThe use of height-diameter models have important applications in the management of eucalyptus plantations. The aim of this paper is to provide adequate height models based on the diameter and stand variables that could be easily used and applied to plantation's management. The data was based on tests located in Espírito Santo and Bahia. A total of 312 plots, including 35 different treatments (different initial planting densities, number and severity of thinning operations, fertilization regimes, among others), and four different clones. This resulted in 2,407 conditions for 85,608 tree measurements. The constructed equations were based on mixed-effect models, in order to accommodate possible autocorrelations, to address variations between sites and to obtain locally calibrated estimates. Among the different model structures and combination of variables tested and presented, the best model showed a coefficient of determination of 0.953 and 0.988, for the fixed and fixed+random parts, respectively. The model included a random factor for measurements-within-tree and tree-within-plot. The bias of the fixed part was 0.208 cm (0.0659%). We believe the models in this study can have broad applications in management and inventory methods applied to plantations. HEIGHT-DIAMETER MODELS FOR EUCALYPTUS SP. PLANTATIONS IN BRAZIL 10 CERNEFERRAZ FILHO et al.

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“…Martins Neto et al (2013) observed tendencies of underestimation for the diameters in upper parts of the trunk using data obtained with terrestrial LiDAR. Oliveira et al (2014), using aerial LiDAR, reported tendency to underestimate the trees height in 5%, and total timber volume in the stand in 11.4%. Buck et al (2012) and Buck et al (2014) reported that the presence of branches resulted in decrease in the density of points, mainly in the upper parts of trees, hindering the 3D modeling.…”

Section: Discussionmentioning

confidence: 95%

TRIDIMENSIONAL (3D) MODELING OF TRUNKS AND COMMERCIAL LOGS OF Tectona grandis L.f.

Chaves

Sanquetta

Arce

et al. 2018

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The development and application of technological innovations have been some of the main focuses of the productive sectors. One technological innovation that has been gaining prominence is the three-dimensional modeling (3D) of inventory and forest planning activities. In this study, it was possible to assess the accuracy of three-dimensional scanning of trunks of Tectona grandis L.f. by digital photogrammetry by using photos taken with a smartphone. The study was carried out in a Teak plantation of 46.54 ha. Systematic sampling by plots was used. Based on the diametric distribution of the stand, thirty trees were selected for the threedimensional scanning procedure by the Close to Range technique. After three-dimensional scanning, each tree was scaled by the Smalian method and sectioned into 2.35 meters long logs for assessment using the xylometer method. The thirty trees resulted in 121 logs that had their volumes measured using the xylometer. Using threedimensional modeling, it was possible to model and measure the volume of 71 logs in classes A (0.10 to 2.45), B (2.45 to 4.80), and C (4.80 to 7.15). The trunk of the trees could not be modeled for all trees at the highest heights because of the quality of the cloud of data points. Records that could not be entirely modeled (2.35 meters) were ignored. The cubing methods were compared by the paired t-test. Therefore, it was possible to model lower logs (0.10 m to 2.45 m) more accurately than by using the traditional Smalian method, with a one-meter interval between sections. Keywords: Scaling, teak, xylometer, scanning, close to range. ResumoModelagem Tridimensional (3D) de fustes e toras comerciais de Tectona grandis L.f. O desenvolvimento e aplicação de inovações tecnológicas vêm sendo alguns dos principais focos dos setores produtivos. Uma inovação tecnológica que vem ganhando destaque é a modelagem tridimensional (3D) das florestas em atividades de inventário e planejamento florestal. Neste trabalho, foi possível avaliar a acurácia do escaneamento tridimensional de fustes para Tectona grandis L.f. por meio da fotogrametria digital, empregando fotos retiradas com smartphone. O estudo foi desenvolvido num plantio de Teca de 46,54 ha. Foi empregado o processo de amostragem sistemático por parcelas. Com base na distribuição diamétrica do povoamento, trinta árvores foram selecionadas para o procedimento de escaneamento tridimensional pela técnica Close to Range. Após o escaneamento tridimensional, cada árvore foi cubada pelo método de Smalian e seccionada em toras de 2,35 metros de comprimento para avaliação pelo método do xilômetro. As trinta árvores resultaram em 121 troncos, que tiveram seus volumes medidos usando xilômetro. Usando modelagem tridimensional, foi possível modelar e medir o volume de 71 toras nas classes A (0,10 a 2,45), B (2,45 a 4,80) e C (4,80 a 7,15). O tronco das árvores não pode ser modelado para todas as árvores nas alturas mais altas devido à qualidade da nuvem de pontos de dados. Os registros que não puderam ser modelados inteira...

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Determinação do volume de madeira em povoamento de eucalipto por escâner a laser aerotransportado

Cited by 13 publications

References 19 publications

Crescimento Inicial De Eucalipto E Acácia, Em Diferentes Arranjos De Integração Lavoura-Pecuária-Floresta

Crescimento Inicial De Eucalipto E Acácia, Em Diferentes Arranjos De Integração Lavoura-Pecuária-Floresta

HEIGHT-DIAMETER MODELS FOR Eucalyptus sp. PLANTATIONS IN BRAZIL

TRIDIMENSIONAL (3D) MODELING OF TRUNKS AND COMMERCIAL LOGS OF Tectona grandis L.f.

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