Revista Arvore 

About: Revista Arvore is an academic journal published by Sociedade de Investigações Florestais. The journal publishes majorly in the area(s): Germination & Population. It has an ISSN identifier of 0100-6762. Over the lifetime, 2162 publications have been published receiving 31715 citations.

Padrão de qualidade de mudas de Trema micrantha (L.) Blume, produzidas sob diferentes períodos de sombreamento

Abstract: This work aimed to verify the influence of the under shading period in the parameters employed to evaluate Trema micrantha (crindiuva) seedling quality pattern. The research was carried out using a randomized design, with four replications per treatment and 88 plants per replication. Three evaluations were performed at 90, 120 and 150 days after emergence. The following treatments were used in the evaluation: Evaluation I, 45, 60, 75 and 90; Evaluation II, 45, 60, 75, 90, 105 and 120 and Evaluation III, 45, 60, 75, 90, 105, 120, 135 and 150 days under shading with 48% of solar radiation retention, respectively. The morphological parameters of the seedlings, their relationships, and the Dickson quality index were evaluated. Seedlings developed under the longer shading periods presented higher shoot heights and leaf area but the lowest values for seedling quality, such as smaller stem diameter, root dry mass and the Dickson quality index. They also presented an increase in shoot height/stem diameter and shoot/root ratios. Period under shading did not affect significantly the parameters for leaf area, leaf dry mass, shoot and total. Seedlings showed better quality patterns at 120 days, when grown under 45 and 60 days under shading. The Dickson's quality index was the best and the most suitable parameter to evaluate the target seedling grown in a suspended nursery.

Parâmetros morfológicos na avaliação da qualidade de mudas de eucalyptus grandis

Abstract: An experiment was carried out to study the morphological parameters used to evaluate the quality of Eucalyptus grandis seedlings produced in different tube sizes. A mixture of 80% organic compound (CO) and 20% charcoal powder fertilized with and without N, P and K was used as substrate. Four sizes of hard plastic tubes at the volumes of 50, 110, 200 and 280 cm 3 were used as packaging. Height and height/weight relationship of the aerial part dry matter should be considered, since although providing a satisfactory contribution to seedling quality pattern, the parameters did not present a destructive process. The use of height only to estimate the quality of Eucalyptus grandis seedlings in the 110 cm 3 volume tube when they were 90-day old should be used, since it presents a satisfactory relative contribution, besides being a nondestructive, easily determined and measured parameter.

Caracterização morfométrica da bacia hidrográfica do rio Debossan, Nova Friburgo, RJ

Abstract: The objective of this work was to perform a morphometric characterization based on some physical parameters. In order to do so, a Hydrologically Consistent Digital Elevation Model (HCDEM) was generated from IBGE topographical maps, scale 1:50.000, using as database and analysis the system of geographic information, by means of the ArcVIEW and Arc/INFO version 8.3 systems. From this, some morphometric parameters of a previous study on the hydrologic behavior of the watershed were calculated. The drainage area was 9,9156 Km2 and 17,684 km in perimeter. The Debossan river watershed was proven not easily subject to floods as the compacity coefficient was far from the unit (1.5842) and its shape factor presented a low value (0.3285). Such fact can still be proven by the circularity index value (0.3985). The drainage density was 2,3579 Km/Km2, showing that the watershed has average draining capacity. The drainage system forms a dendritic pattern. This pattern occurs in high lands, in which the regolith and the parent rock relatively provide a uniform resistance to erosion. The more elongated watershed shape, as the circularity index, shape factor and compacity coefficient, indicates that the rainwater volume that falls within the watershed is concentrated in different points, contributing to reduce rain intensities that could cause greater flow variations.

Morfometria da bacia hidrografica da Cachoeira das Pombas, Guanhães - MG

Abstract: RESUMO – O objetivo deste trabalho foi estudar a morfometria da bacia hidrografica da Cachoeira das Pombas, localizada no Municipio de Guanhaes, MG. A base de dados foi disponibilizada pelo convenio SIF/CENIBRA/ UFV e consistiu dos dados matriciais Modelo Digital de Elevacao Hidrologicamente Consistente (MDEHC), rede hidrografica e direcoes de escoamento. As caracteristicas morfometricas e delimitacao da bacia e subbacias hidrograficas foram obtidas automaticamente pelo software Hidrodata 2.0. A area de drenagem encontrada foi de 6,981 km² e o perimetro de 14,864 km. De forma geral, constatou-se que a area estudada possui forma alongada, com baixa densidade de drenagem, relevo forte-ondulado e declividade media de 33,9%. Esses parâmetros possuem grande influencia sobre o escoamento superficial e, consequentemente, sobre o processo de erosao, que resulta em perda de solo, agua, materia orgânica, nutrientes e microfauna, que podem vir a provocar o assoreamento e eutrofizacao dos corpos d´agua. Quanto a orientacao do terreno, pode-se se constatar que 41% do terreno da bacia hidrografica esta exposto a face norte-oeste, e 33% de sua area total encontra-se sombreada. Para um estudo mais detalhado, procuraram-se caracterizar suas sub-bacias, onde cada uma foi analisada individualmente, concluindo-se que as cinco sub-bacias apresentam deficiencia de densidade de drenagem e forma alongada. Em termos de declividade media, os valores variaram entre 29,6 e 40,4%, representando o relevo forte-ondulado. Pode-se constatar, tambem, que a morfometria diferenciada entre as sub-bacias evidencia a necessidade de um manejo especifico de cada uma delas.

Caracterização tecnológica, para produção de celulose, da nova geração de clones de Eucalyptus do Brasil

Abstract: Foram analisados clones de Eucalyptus de ultima geracao, pertencentes as principais empresas brasileiras de celulose. Os estudos consistiram numa caracterizacao tecnologica detalhada da qualidade das madeiras utilizadas no processamento fabril das empresas. Foram realizadas analise quimicas detalhadas das madeiras e cozimentos kraft, simulando-se uma das modernas tecnica de digestor continuo. Os resultados indicaram a alta qualidade dos clones de Eucalyptus atualmente plantados no Brasil para producao de celulose.