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| Silva, Sérgio Teixeira da; Mello, José Marcio de; Acerbi Junior, Fausto Weimar; Reis, Aliny Aparecida dos; Raimundo, Marcel Regis; Silva, Iasmim Louriene Gouveia; Scolforo, José Roberto Soares. |
| Remote sensing imagery can be a very useful auxiliary tool for native forests inventory. Thus, the objective of this study was to evaluate the stratification of a cerrado (Brazilian savanna) patch based on visual image interpretation techniques as well as to compare the errors from two sampling designs, the Stratified Random Sampling (SRS) and the Systematic Sampling (SS).The study area corresponds to a cerrado sensu stricto patch located in the municipality of Papagaios, Minas Gerais, Brazil. The cerrado wood volumes were obtained from a forest inventory field campaign where 32 plots were measured systematically. The study area was stratified based on a visual interpretation of a Landsat 5 TM image, and the strata formed were: “Strata I”, “Strata II”,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Systematic sampling; Tratified Random Sampling; Visual image interpretation; Remote Sensing Engenharia Florestal; Manejo e Inventário Florestal; Sensoriamento Remoto Amostragem Sistemática; Amostragem Casual Estratificada; Interpretação visual de imagens; Sensoriamento remoto. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/742 |
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| Morais, Vinícius Augusto; Silva, Carlos Alberto; Scolforo, José Roberto Soares; Mello, José Márcio; Araújo, Emanuel José Gomes de; Assis, Edson Aquiles de. |
| The total soil organic carbon (C) is regulated by climatic factors, altitude, texture and soil depth. Due to higher storage in surface, it is common to observe the exponential model to adjust the C content in the soil profile. This study was carried out in order to study the influence of climatic factors, altitude and soil depth on the vertical distribution (0-100 cm) of C in five Cerrado fragments located in the municipalities of Januária and Bonito de Minas, Minas Gerais State, Brazil. Soil samples were collected in the following layers: 0-10, 10-20, 20-40, 40-60 and 60-100 cm. The maximum and minimum levels of C varied depending on the sampling site, fragment and soil layer sampled. Larger variations in the levels of C were noted for the 0-10 cm layer,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climatic change; Root; Litter; Total organic carbon Recursos Florestais; Engenharia Florestal; Manejo Florestal Mudanças climáticas; Raiz; Serrapilheira; Carbono orgânico total. |
| Ano: 2013 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/507 |
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| Araújo, Emanuel José Gomes de; Pelissari, Allan Libanio; David, Hassan Camil; Miranda, Rodrigo Otávio Veiga de; Péllico Netto, Sylvio; Morais, Vinícius Augusto; Scolforo, José Roberto Soares. |
| O objetivo do presente trabalho foi ajustar modelos de distribuição diamétrica, relação hipsométrica, afilamento e volume, a fim de caracterizar as relações dendrométricas para Pinus sp. em fragmentos remanescentes de povoamentos da década de 1970 na região da Reserva de Desenvolvimento Sustentável Veredas do Acari, norte do estado de Minas Gerais. Foi realizada a identificação dos fragmentos de Pinus sp. e efetuado o seu mapeamento. Foram coletados dados biométricos das árvores para as modelagens da distribuição diamétrica, relação hipsométrica, afilamento e volume individual. O critério de seleção dos modelos consistiu na avaliação do coeficiente de determinação ajustado, erro padrão da estimativa em porcentagem, teste F, significância dos coeficientes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Mensuração Florestal Distribuição diamétrica; Modelos hipsométricos; Funções de afilamento; Modelos volumétricos Diameter distribution; Hypsometric models; Taper; Volumetric models. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/425 |
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| Araújo, Emanuel José Gomes de; Pelissari, Allan Libanio; David, Hassan Camil; Scolforo, José Roberto Soares; Netto, Sylvio Péllico; Morais, Vinícius Augusto. |
| The objective of this work was to adjust traditional models of hypsometric relations for homogeneous candeia stands, under different initial spacings. Ten models were adjusted for hypsometric relations. The assessment criteria obeyed the highest determination coefficient and the lowest standard error of estimate in percentage. The F test was also evaluated, as well as the significance of the regression coefficients, the graphical analysis of the residues and the identity test when the same model was selected for different treatments. It was observed that, over time, the hypsometric curves reduce their tilt, move to the right and elevate, reducing the interval among them from the sixth year. The traditional hypsometric relation models as Henricksen,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hypsometric models Height/diameter relation Identity of models Recursos Florestais; Engenharia Florestal Modelos hipsométricos Relação altura/diâmetro Identidade de modelos. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/397 |
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