
Gilson Fernandes da Silva- Federal University of Espírito Santo
Gilson Fernandes da Silva
- Federal University of Espírito Santo
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Publications (142)
This study evaluated the physiological responses of Eucalyptus urophylla × E. grandis under varying water stress levels and their recovery post-rehydration. Plants were exposed to control, light (LS), and moderate (MS) water stress treatments in an open area, with continuous monitoring of meteorological conditions. Physiological parameters, includi...
O objetivo deste estudo foi avaliar a combinação de diferentes comprimentos de seções do tronco na precisão das equações de volume do híbrido Eucalyptus urophylla S. T. Blake x Eucalyptus grandis W. Mill ex Maiden. Foram utilizados dados de 70 árvores provenientes de um plantio experimental com 8 anos de idade. Os diâmetros ao longo dos troncos for...
O objetivo deste estudo foi avaliar o efeito do número de árvores por classe de diâmetro no ajuste de equações de volume de Eucalyptus urophylla x Eucalyptus grandis. Foram utilizados dados de cubagem de 480 árvores de eucalipto, calculadas pela fórmula de Smalian, sendo distribuídas em dez classes de diâmetros com amplitude de 2 cm cada classe (48...
Background: Do tree species that have wood of high commercial value which are being extracted in the Saracá-Taquera National Forest have diameter and spatial distribution patterns that enable continuous production of timber to meet the criteria of ecological conservation and sustainable management of their populations? To answer this question, we e...
The search for more accurate methods for estimating dendrometric variations has intensified, resulting in reliable estimates of the volumetric stock of forest stands. In this context, this study evaluated the accuracy of estimate the total volume of eucalyptus trees using Support Vector Regression (SVR). The data obtained from a eucalyptus stand we...
Quantifying the circularity of flat shapes is a relevant problem in various areas of knowledge, including landscape ecology, watershed analysis and image processing. Therefore, this study, which uses polygons representing forest fragments in the Caatinga biome, was carried out to evaluate different circularity indices. The most used indices for thi...
In many activities linked to wood production, The completion of forest inventories is an essential step for building the strategic and tactical planning of companies, being fundamental to the decision-making process. In forestry companies with large areas of planting, the number of plots installed is very large, which can require planning to effici...
Forest inventories are important in the management of forest resources and have long been conducted using traditional methods, which are generally expensive and time-consuming. With recent advances in terrestrial remote sensing technologies, including light detection and ranging (LiDAR) and photogrammetry, new paradigms have emerged to perform thes...
Background: Extensive research seeks to improve forest management by understanding the effects of silvicultural treatments on productivity. Continuous forest inventory (CFI) plots offer valuable data for such studies. However, accuracy relies heavily on the twin plot concept, where two adjacent plots (twins) are established to isolate treatment eff...
Introdução: A formação qualificada para o trabalho no Sistema Único de Saúde tem nos Programas de Residência Multiprofissional em Saúde da Família (PRMSF) estratégia de treinamento em serviço com características multiprofissional e interdisciplinar. Objetivo: identificar ações desenvolvidas de forma multiprofissional pelos profissionais e residente...
Os Programas de Residência Multiprofissional em Saúde da Família (PRMSF) são uma relevante estratégia na consolidação das políticas de saúde, e na efetivação das ações de Educação Permanente em Saúde (EPS). O estudo teve como objetivo identificar nos PRMSF brasileiros, a articulação das iniciativas com a EPS e descrever como os coordenadores dos PR...
Tropical forests have high species richness, being considered the most diverse and complex ecosystems in the world. Research on the variation and maintenance of biodiversity in these ecosystems is important for establishing conservation strategies. The main objective of this study was to test the Spectral Variation Hypothesis through associations b...
For the knowledge of the dynamics of the world timber market, it is necessary to monitor and understand its trends. Given the above, the objective was to evaluate the behavior of Brazil in the world market for sawn wood non-coniferous tropical and to analyze the trends of production, export, and import of the most expressive countries in this marke...
Stacked timber is quantified in-store units and then adjusted with a conversion factor for volume estimation in cubic meters, which is important for the wood trade in South America. However, measuring large quantities accurately can be challenging. Digital image processing and artificial intelligence advancements offer promising solutions, making r...
Introdução: A qualificação pedagógica para os profissionais que atuam nos Programas de Residência Multiprofissional em Saúde da Família (PRMSF) é essencial para o exercício da função educacional. Objetivo: descrever os processos de planejamento e implementação da formação em PRMSF. Metodologia: Estudo exploratório de abordagem quantitativa. Dados d...
Monitoring reduced impact logging (RIL) activities in sustainably managed forest areas in the Amazon is a costly and complex, yet crucial endeavor. One viable monitoring option is the use of airborne laser scanning (LiDAR), which enables estimating forest structure parameters over large areas in a reduced timeframe with high accuracy. In this study...
Este estudo analisa a viabilidade técnica do manejo florestal sustentável em uma área sob concessão na Floresta Nacional de Saracá-Taquera, na Amazônia Oriental. Foram coletados dados das Unidades de Produção Anual 6 e 3 das Unidades de Manejo Florestal II e 1A, respectivamente. Os ciclos de corte e arraste de toras foram monitorados e cronometrado...
Planning the allocation of infrastructure exploration in native forests plays an important role in reducing costs and environmental damage. Traditionally, companies manually plan the infrastructure for exploration, which requires a lot of time and effort and implies low planning precision. Additionally, it makes it impossible for decision-makers to...
Remote sensing applications in forest inventories allow for a detailed view of areas with extensive forest cover while potentially lowering costs. In this context, the objective of this study was to propose a methodology for using Landsat data to predict and project eucalyptus forest growth and yield, as well as to analyze forest growth dynamics. T...
Caatinga is a dry forest, which occupies almost one million square kilometers in the Brazilian territory, representing more than 11% of the territory. However because of the extensive areas to be inventoried and the difficulties in collecting data from this natural vegetation using traditional techniques, the operation becomes very costly, often re...
The definition of strategies for forest restoration projects depends on information of the successional stage of the area to be restored. Usually, classification of the successional stage is carried out in the field using forest inventory campaigns. However, these campaigns are costly, time-consuming, and limited in terms of spatial coverage. Curre...
The productivity of wood harvesting operations is one of the main viability indicators of the forestry enterprise, which is directly influenced by land, population, and operational planning characteristics. The variables that affect the productivity of harvesting machines are particularly difficult to measure and have complex relationships, making...
The heartwood formation process is little known in fast growing plantation woods. Therefore, the aims of this study were to determine how planting spacing and tree age affect the formation and proportion of heartwood and sapwood, as well as the density of eucalyptus wood. Trees from a eucalyptus clonal plantation ( Eucalyptus grandis × E. urophylla...
Forest production and growth are obtained from statistical models that allow the generation of information at the tree or forest stand level. Although the use of regression models is common in forest measurement, there is a constant search for estimation procedures that provide greater accuracy. Recently, machine learning techniques have been used...
In forests of the Amazon biome, Sustainable Forest Management Plans are based on technical guidelines. Such legislation provides for a cutting cycle that can vary from 25 to 35 years and a minimum cutting diameter of 50 cm. In view of the above, the present research aimed to evaluate the accuracy of regression models for the projection of growth in...
Digital aerial photogrammetry (DAP) data acquired by unmanned aerial vehicles (UAV) have been increasingly used for forest inventory and monitoring. In this study, we evaluated the potential of UAV photogrammetry data to detect individual trees, estimate their heights (ht), and monitor the initial silvicultural quality of a 1.5-year-old Eucalyptus...
Regression analysis is a traditional technique to fit equations and predict tree and forest attributes. However, problems may occur when the data show high dispersion around the mean of the regressed variable, limiting the use of traditional methods such as the Ordinary Least Squares (OLS) estimator. Hence, the objectives were to propose a Quantile...
The objective of this study was to evaluate three estimation methods to fit volume equations in the presence of influential or leverage data. To do so, data from the forest inventory carried out by the Centro Tecnológico de Minas Gerais Foundation were used to fit the Schumacher and Hall (1933) model in its nonlinear form for Cerradão forest, consi...
The construction of forest roads in Brazilian Amazon is costly and has a significant environmental impact. Several practices and principles must be observed to comply with legislation, to preserve the remaining forest, and to ensure sustainable exploitation. Road planning is complex in this context, based on the number of aspects and variables that...
The objective of this study was to evaluate the accuracy of nonlinear mixed effect regression models in the growth projection of individual trees of Hevea brasiliensis. Planting is in the municipality of Linhares in the state of Espírito Santo and has a total area of 784 m². The trees are planted at 2.0 x 2.0 m spacing. Tree measurements were perfo...
Este trabalho teve como objetivo geral avaliar, do ponto de vista econômico, diferentes modelos de sistemas silvipastoris no Sul do Espírito Santo. Os sistemas analisados foram os seguintes: Capim-marandu (CM) em monocultivo; Eucalipto em monocultivo; CM em sistema silvipastoril com Eucalipto; CM em sistema silvipastoril com Eucalipto + Leucena; CM...
The objective of this study was to compare different alternatives to estimate the stem volume of individual trees in four different forest formations in the Minas Gerais state, Brazil. The data were obtained in a forest inventory procedure performed by the Minas Gerais Technological Center Foundation. The stem volumes were computed by the Smalian e...
In Amazonian native forest management, forest road infrastructures, such as log storage yards and skid trails, are the most expensive attributes and are responsible for the significant environmental impacts with selective tree felling. Road optimization is crucial for reducing environmental impacts and production costs and is strongly linked to the...
A continuously competitive forest market and tied to the demands for wood products promotes the study and development of applications that increase the revenue of the forest enterprises. At harvesting, the cutting pattern (forest assortment) in which the trees are traced is traditionally determined by the experience of the chainsaw operator without...
In the sustainable management of Amazonian forests, it is essential to carry out the optimal planning of logging infrastructures to reduce costs and environmental impacts. However, there is a high degree of complexity due to the number of variables involved. Among these infrastructures, wood storage yards are of utmost importance as they directly i...
O presente trabalho apresenta uma nova abordagem para representar e obter soluções para o Problema de Roteamento de Veículos no planejamento de inventários florestais (PRV-IF). Para tal, foi proposto um modelo adaptado do Problema de Roteamento Periódico de Veículos com Janela de Tempo (PRPVJT) para o problema. Os métodos de solução utilizados fora...
Este trabalho teve como objetivo verificar a ocorrência de diferenças nas estimativas de diâmetro, altura e volume em diferentes níveis de amostragem por meio de diferentes comprimentos de seções, considerando ou não a influência da base com o uso de funções de afilamento. No processo de cubagem, foram medidos 70 fustes do híbrido Eucayptus urophyl...
Weibull distributions have been widely used to describe tree stem diameter distributions. However, there is a scarcity of studies that suggest the best Weibull formulation. The parameters of the Weibull distribution are usually predicted by either the parameter prediction method (PPM) or the parameter recovery method (PRM), although other methods h...
Livro da Editora Conhecimento Livre composto por diversos artigos científicos sobre aplicações relacionadas à Engenharia da Produção.
The objective of this study was to assess and compare two methodologies to predict the mortality of individual trees in a seasonal semi-deciduous forest located in the municipality of Viçosa, Minas Gerais, Brazil. The data came from 10 permanent plots and were randomly divided into two groups: fitting (6 plots) and validation (4 plots). When assess...
The Brazilian Savannah, known as Cerrado, has the richest flora in the world among the savannas, with a high degree of endemic species. Despite the global ecological importance of the Cerrado, there are few studies focused on the modeling of the volume and biomass of this forest formation. Volume and biomass estimation can be performed using allome...
The objective of this study was to analyze different methods of measuring the commercial height of trees for purposes of sustainable forest management in a native forest in the Amazon region. The study was carried out in a Forest Settlement Project. The measurement methods used were: visual, performed by a person with experience, Suunto clinometer,...
The objective of this study was to evaluate the use of the MSI Sentinel-2 and SRTM data to estimate the volume of wood in a Semidecidual Seasonal Forest. Regression equations were fitted based on the remote sensing data, taking into consideration the individual bands and vegetation index of the MSI, elevation values and their derivatives obtained f...
Um dos principais desafios atribuído ao planejamento da exploração de florestas nativas é a regulação da produção florestal, muitas vezes realizada por meio da divisão da Área de Manejo Florestal (AMF) em Unidades de Produção (UP). Levando em consideração a existência de um mercado cada vez mais competitivo e as dificuldades em alocar manualmente a...
Resumo Estudos sobre a estrutura vegetacional de fragmentos florestais que consideram o uso pretérito do solo podem contribuir para subsidiar ações conservacionistas e de restauração florestal. A partir disso, objetivamos comparar três sítios de um fragmento florestal com distintas histórias de perturbação e verificar se os mesmos diferem entre si...
ABSTRACT This paper aimed to estimate the basic density (DB) of the wood of Cerrado species using mixed linear models. For performing the DBH measurement, the sampling of 334 individuals was carried out. By keeping the Pilodyn apparatus in the DBH position, two measurements were made on opposite sides. Further, for determining DB, the trees were kn...
O software SOFIA foi desenvolvido com objetivo de otimizar o estabelecimento de UPAs
com o objetivo de minimizar a distância entre os indivíduos pertencentes à uma determinada UPA, e ao mesmo tempo, regulando os fatores renda e volume de madeira a ser extraída. Os fatores renda e volume de madeira podem ser estabelecidos individualmente, ou seja, d...
Models of individual trees are composed of sub-models that generally estimate competition, mortality, and
growth in height and diameter of each tree. They are usually adopted when we want more detailed information
to estimate forest multiproduct. In these models, estimates of growth in diameter at 1.30 m above the ground
(DBH) and total height (H)...
The aim of this work was to evaluate the accuracy of total height estimation with regression models and artificial neural networks (ANNs) in a pure ipê felpudo plantation. We adjusted four regression models and trained Multilayer Perceptron artificial neural networks, with two training criteria: considering the input variables DBH, age and dominant...
This study aimed to analyze the diametric structure of the stand and of five species of highest importance value for a Caatinga area, located in the municipality of Floresta, state of Pernambuco, Brazil. The work was developed from 40 sample units of 400 m² each, systematically allocated. All individuals with tree circumference at the base (0.30 m)...
The present study aimed to optimize the location of wood storage yards in forest management for the production of wood in the Brazilian Amazon. The area of forest management studied was 638.17 ha, with 1478 trees selected for harvest with a diameter at breast height of at least 50 cm in accordance with Brazilian legislation. Taking the topography i...
O presente trabalho objetivou avaliar o ajuste do algoritmo Particle Swarm Optimization (PSO) no treinamento de RNA para estimativa de altura de árvores de eucalipto. Os dados utilizados neste estudo foram provenientes de medições de inventários florestais contínuos conduzidos em povoamentos de um clone de eucalipto, localizados no Sul da Bahia, Br...
Este estudo teve por objetivo avaliar a eficiência de dois classificadores convencionais e uma rede neural MLP para o mapeamento do uso da terra a partir de uma imagem VANT. Foram definidas quatro classes na imagem para a classificação automática: eucalipto, pastagem, matocompetição e solo exposto. O algoritmo utilizado no simulador de redes neurai...
A potencialidade silvicultural e econômica do paricá (Schizolobium amazonicum) tem incentivado a expansão desta cultura, principalmente na região norte do país, despertando a necessidade de estudos sobre a espécie. Deste modo, objetivou-se neste trabalho estimar a produção de paricá na região de Paragominas, PA, aos 5, 6 e 7 anos, em três classes d...
Neste trabalho objetivou-se verificar o erro cometido ao simular a medição de altura de árvores com inclinação do tronco empregando-se hipsômetros baseados em princípios trigonométricos. Para efeito desse estudo, foram consideradas as situações em que a árvore está localizada em terreno plano ou inclinado, e as situações em que a inclinação da árvo...
RESUMO: Neste trabalho objetivou-se verificar o erro cometido ao simular a medição de altura de árvores com inclinação do tronco empregando-se hipsômetros baseados em princípios trigonométricos. Para efeito desse estudo, foram consideradas as situações em que a árvore está localizada em terreno plano ou inclinado, e as situações em que a inclinação...
O CLUSTER OPTIMIZER é um software que utiliza um método heurístico para a obtenção de soluções viáveis sub-ótimas para a definição de áreas de produção florestal.
The main purpose of this study was to assess nonlinear models generated by in-tegrating the basal area growth rate to estimate the growth and yield of forest stands. The database was collected from permanent sample units, in Paraopeba county, in the state of Minas Gerais, Brazil. The stands were represented by Eucalyptus camaldulensis × Eucalyptus...
The objective of this study was to analyze the ability of an artificial neural network (ANN) to describe the stem profile of trees of different genera and species in different growing conditions. For comparative purposes, equations were fit, using regression analysis to describe the stem profile. For neural network as well as for the regression equ...
O objetivo deste trabalho foi verificar a acurácia do método de Pressler e o uso do fator de forma na estimação do volume de árvores individuais de teca (Tectona grandis L. f.), cubadas por meio do uso do relascópio de Bitterlich. A base de dados para o presente trabalho foi composta de 45 árvores-amostra cubadas em pé pelo seccionamento absoluto d...
The aim of this study was to evaluate the method of neuroevolution of augmenting topologies (NEAT) to adjust the weights and the topology of artificial neural networks (ANNs) in the estimation of tree height in a clonal population of eucalyptus, and compare with estimates obtained by a hypsometric regression model. To estimate the total tree height...
The objective of this study was to analyze the ability of an artificial neural network (ANN) to estimate the total height of two tree species in different growing conditions. For comparison purposes, it was also adjusted Campos hypsometric model, applied by stratum as genus, species, rotation, spacing and age classes. The evaluation of artificial n...
objetivou-se nesse estudo avaliar a eficiência das funções Weibull, Hiperbólica, Loglogística,
Logística generalizada, Fatigue e Frechet para a descrição da estrutura diamétrica de
povoamentos de eucalipto submetidos a desbaste. Os dados desse estudo são provenientes de um
experimento sobre desbastes, localizados em três instalações, abrangendo loc...
The objective of this study was to apply and evaluate methods to estimate multiple volumes in a Community Management Area, located in the Tapajós National Forest. 516 sample-trees were rigorously scaled of 21 commercial species, all with 50 cm ≥ dbh < 160 cm. The unique model for multiple volumes (regression analysis) proposed by Leite et al. (1995...
The aim of this study was to evaluate the performance of laminate wood paricá (Schizolobium amazonicum Huber ex. Ducke) in commercial plantations in the region of Paragominas, Pará state. Using 180 sample trees aged five, six and seven years,originating from plantations and grown in 4 × 4 m spacing, the average income was evaluated, taking into acc...
ABSTRACT The aim of this study was to evaluate the performance of laminate wood paricá (Schizolobium amazonicum Huber ex. Ducke) in commercial plantations in the region of Paragominas, Pará state. Using 180 sample trees aged five, six and seven years,originating from plantations and grown in 4 x 4 m spacing, the average income was evaluated, taking...
Objetivou-se, neste trabalho, avaliar a dinâmica do estoque de carbono no fuste das
árvores de uma Floresta Estacional Semidecidual, por meio do monitoramento de 10
parcelas permanentes instaladas na Mata da Silvicultura, Viçosa, Minas Gerais. Foram
identificados e medidos todos os indivíduos com DAP ≥ 5 cm, nos anos de 1994, 1997,
2000, 2004 e 200...
O objetivo deste estudo foi avaliar o crescimento de espécies florestais nativas mediante a utilização de diferentes métodos de restauração florestal e submetidas a diferentes técnicas de manutenção, em uma Mata de Tabuleiros. O experimento foi instalado em agosto de 2007, na Reserva Natural Vale (RNV), Linhares, ES, em blocos casualizados que cons...
RESUMO: Objetivou-se, no presente trabalho, avaliar modelos para estimar a produção de sortimentos de plantios clonais do híbrido Eucalyptus camaldulensis x Eucalyptus urophylla com espaçamento 3 x 3 m, localizados em Paraopeba, Minas Gerais, Brasil. Para estimar a produção em área basal e volume dos sortimentos de povoamentos, foram utilizados dad...
The diameter and height growth model is one of three submodels used for simulating individual tree growth. In Brazil, there are few studies on the dimensional growth of individual trees be they native or exotic species, despite their potential. This study aimed to evaluate diameter and height growth models for individual trees for eucalyptus stands...
The aim of this research was to evaluate different adjustments of taper functions for the estimates of the variables diameter, height and volume using the coefficients obtained from the adjustment obtained on the original model and the expression of hi and di variables. Evaluated were the taper models of Baldwin, Demaerschalk, Kozak e Ormerod of Eu...
The objective of this study was to estimate volume, biomass and carbon Stocks in trees (level 1), shrubs and seedlings (level 2) and litter (level 3), in a Semideciduos Seazonal Forest in Viçosa, Minas Gerais State, Brazil. Data of level 1 of approaching were obtained from 15 plots with 0.1 ha each. Fifteen plots of 25 m2 and 6.25 m2were used in le...
This study was conducted in a semideciduous forest fragment of 52 hectares, known as Rosal Forest, in the municipality of Guaçuí, Espírito Santo state. It had the objective to test vertical stratification methodologies, evaluating the appropriateness of these methodologies based on the ecological successional classification of the species. To do so...
This work aims to evaluate the use of parametric models instead of a nonparametric procedure to adjust survival curves related to different treatments, and to verify the equivalence among treatments by the multivariate method of cluster analysis. The dataset used to validate the method was obtained from a laboratory experiment with cutting ants. Ei...
Normal 0 21 false false false PT-BR X-NONE X-NONE O estudo foi realizado na Floresta do Rosal, Guacui, ES, para avaliar precisao e tempo de execucao de metodos de estimacao de altura, em diferentes condicoes de terreno, com os metodos hipsometro Vertex (1); clinometro digital (2); estimacao com auxilio de uma regua de 15 metros (3); e estimacoes vi...
This study evaluated the structure of the tree community of Pacotuba National Forest, in Cachoeiro de Itapemirim ES. For the phytossociological inventory, 12 sample plots of 40 x 50 m each were systematically laid out. All trees with DBH≥5 cm were measured and identified. The phytossociological analysis was based on the absolute and relative para...
This study aimed to present an approach to model the growth and yield of the species Schizolobium amazonicum (Paricá) based on a study of different spacings located in Pará, Brazil. Whole-stand models were employed, and two modeling strategies (Strategies A and B) were tested. Moreover, the following three scenarios were evaluated to assess the acc...
The objective of this study was to evaluate the influence of different sources of variation in tree height measurements using hypsometers based on trigonometric principles. The use of this type of device requires that the measurement is at a known distance from the tree. Therefore, if these distances are small or too big, oscillations can occur dur...
The objective of this work was to compare methods of tree height measure in natural foress. Total heights measured by hypsometer Vertex were compared with those obtained by escalade of the trees. The method of visual estimate was also tested, with and without training, as a more practical alternative and of slower cost. The tested methods were eval...
http://dx.doi.org/10.5902/198050985085Os objetivos deste trabalho foram modelar a forma de tronco de Pinus taeda L., comparar a eficiência na estimativa do volume total do polinômio do quinto grau ajustado com dados não estratificados e estratificados segundo quocientes de forma e apresentar os resultados em forma de tabela de sortimentos. As árvor...
Este estudo teve por objetivo avaliar a estrutura horizontal do componente arbóreo da Reserva Particular do Patrimônio Natural Cafundó, localizada em Cachoeiro de Itapemirim, Espírito Santo. Para tanto, foram alocadas 25 parcelas de 20x50 m (área total: 2,5 hectares) e amostrados todos os indivíduos com DAP ≥5 cm, sendo registrados 4557 indivíduos,...