135 documents found, page 1 of 14
ALTERNATIVES TO ESTIMATE THE VOLUME OF INDIVIDUAL TREES IN FOREST FORMATIONS IN...
Abreu,Jadson Coelho de; Soares,Carlos Pedro Boechat; Leite,Helio Garcia; Binoti,Daniel Henrique Breda; Silva,Gilson Fernandes daABSTRACT 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 expression up to the outside bark diameter equal to 4 cm...
Modeling Mortality of Individual Trees in a Seasonal Semi-Deciduous Forest
Figueiredo,Lívia Thaís Moreira de; Soares,Carlos Pedro Boechat; Castro,Renato Vinícius Oliveira; Leite,Helio Garcia; Souza,Agostinho Lopes deAbstract 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 assessing Methodology 1, the mortality was considered a dicho...
TEMPORAL AND SPATIAL VARIABILITY OF THE DIAMETER DISTRIBUTION IN A SECONDARY BR...
Caliman,Jônio Pizzol; Reis,Geraldo Gonçalves dos; Reis,Maria das Graças Ferreira; Leite,Helio Garcia; Torres,Carlos Moreira Miquelino EletoABSTRACT The diameter distribution of a forest makes it possible to understand its ecological processes and to define actions related to forest management aiming at forest conservation, biodiversity increase, production, and carbon sequestration, among others. This study aimed to identify variation in the diameter distribution in a secondary Atlantic Forest, as a function of sites, over 24 years. The diameter a...
Artificial neural networks, quantile regression, and linear regression for site...
Araújo Júnior,Carlos Alberto; Souza,Pábulo Diogo de; Assis,Adriana Leandra de; Cabacinha,Christian Dias; Leite,Helio Garcia; Soares,Carlos Pedro BoechatAbstract: The objective of this work was to compare methods of obtaining the site index for eucalyptus (Eucalyptus spp.) stands, as well as to evaluate their impact on the stability of this index in databases with and without outliers. Three methods were tested, using linear regression, quantile regression, and artificial neural network. Twenty-two permanent plots from a continuous forest inventory were used, m...
Modeling of tree recruitment by artificial neural networks after wood harvestin...
Reis,Leonardo Pequeno; Souza,Agostinho Lopes de; Reis,Pamella Carolline Marques dos Reis; Mazzei,Lucas; Leite,Helio Garcia; Soares,Carlos Pedro BoechatAbstract Recruitment models in tropical forests are important for studies on forest management sustainability because they provide adequate support to recovery of wood stocks. The objective of this work was to estimate recruitment after wood harvesting by using an artificial neural network (ANN) model. The study area is located at Tapajós National Forest (55° 00’ W, 2° 45’ S), Pará state. In 64 ha of the study ...
Growth and yield of teak stands at different spacing
Medeiros,Reginaldo Antonio; Paiva,Haroldo Nogueira de; D’Ávila,Flávio Siqueira; Leite,Helio GarciaAbstract: The objective of this work was to evaluate the growth and yield of teak (Tectona grandis) stands at different spacing and in different soil classes. Twelve spacing were evaluated in an Inceptisol and Oxisol, in plots with an area of 1,505 or 1,548 m2, arranged in a completely randomized design with nine replicates. The teak trees were measured at 26, 42, 50, and 78 months of age. Total tree height was...
Airborne laser scanning applied to eucalyptus stand inventory at individual tre...
Cosenza,Diogo Nepomuceno; Soares,Vicente Paulo; Leite,Helio Garcia; Gleriani,José Marinaldo; Amaral,Cibele Hummel do; Gripp Júnior,JoelAbstract: The objective of this work was to evaluate the application of airborne laser scanning (ALS) to a large-scale eucalyptus stand inventory by the method of individual trees, as well as to propose a new method to estimate tree diameter as a function of the height obtained from point clouds. The study was carried out in a forest area of 1,681 ha, consisting of eight eucalyptus stands with ages varying from...
TUNING OF THE METAHEURISTIC VARIABLE NEIGHBORHOOD SEARCH FOR A FOREST PLANNING ...
Araújo Júnior,Carlos Alberto; Mendes,João Batista; Assis,Adriana Leandra de; Cabacinha,Christian Dias; Stocks,Jonathan James; Silva,Liniker Fernandes daABSTRACT In forest science it is important evaluate new technologies from computational science. This work aimed to test a different kind of metaheuristic called Variable Neighborhood Search in a forest planning problem. The management total area has 4.210 ha distributed in 120 stands in ages between 1 and 6 years old and site index since 22 m to 31 m. The problem was modelled considering the maximization of th...
EVALUATION OF NON-LINEAR TAPER EQUATIONS FOR PREDICTING THE DIAMETER OF EUCALYP...
Souza,Guilherme Silverio Aquino de; Cosenza,Diogo Nepomuceno; Araújo,Ana Carolina da Silva Cardoso; Pimenta,Lucas Veiga Ayres; Souza,Ramon BarretoABSTRACT This study aims to evaluate non-linear stem taper models for predicting the pre-commercial diameter of eucalyptus trees and to analyze the effect of genotype on stem taper. The treatments comprise three different genotypes of Eucalyptus sp. in a 3 × 3 m plantation spacing. Seventy sample trees aged 10 years were felled for each treatment. The outside bark diameter measurements were taken at 0.5 m; 1.0 ...
EXOTIC PALMS THREATENS NATIVE PALMS: A RISK TO PLANT BIODIVERSITY OF ATLANTIC F...
Condé,Tiago Monteiro; Silva,Fernando da; Souza,Agostinho Lopes de; Leite,Helio Garcia; Garcia,Eder Aparecido; Costa,Walter da SilvaABSTRACT Invasive plants can profoundly modify physical and biological characteristics of their new environments, especially when such habitats are already fragmented and reduced by anthropogenic pressure, such as the Atlantic Forest of Brazil. Here, we hypothesized that exotic palms successfully establish among the natural Euterpe edulis populations through a continuous propagule input by avifauna, high germin...