16 documents found, page 1 of 2

Density of Araucaria angustifolia wood from overstocked stand

The aim of this work was to evaluate the radial and longitudinal variations of wood specific gravity in an overstocked stand of Araucaria angustifolia, with 65 years. The stand was located in the National Forest of Açungui, Campo Largo, Parana State, Brazil, with thinning recorded between 1970 and 1980, without subsequent thinnings. We selected three trees for each diameter class: 10-30 cm, 30-50 cm and 50-70 c...

Morphometry of Araucaria angustifolia at different altitudes in Southern Brazil

Morphometric indices can be used to support the understanding of natural forest dynamics. The aim of this study was to describe and evaluate the morphometric and dendrometric characteristics of Araucaria angustifolia, to understanding of the structure of natural Araucaria Forest. The data were obtained in three counties of Santa Catarina State, considering different altitudes of occurrence of the species. We sa...

Wood volume model for Cerrado species from Formosa, Goias State, Brazil

This study aimed to develop models for estimating wood volume of individual trees for nine Cerrado species of Formosa, State of Goias, Brazil. Data were collected from 12 to 15 trees of nine species, representing the diametric classes amplitude of each species in the studying area. Trees were logged and measured and the volume was calculated by Smalian method. Seven mathematical models were tested to estimate t...

Horizontal structure analysis by Kernel density as basis to forest management i...

The present work aimed to characterize the horizontal structure of an area of primary Amazonian Forest and the spatial distribution of the species Goupia glabra (Aubl.), Qualea spp. and Dipteryx odorata (Aubl.) Willd. through the analysis of the Kernel density, aiming to support the planning of forest management. The study area is located in Santa Carmem, microregion of Sinop, state of Mato Grosso (1,024 ha), w...

Idade das árvores e suas aplicações

A existência e o uso dos anéis de crescimento de árvores para contagemdos anos e avaliação do clima, entre outros, já foi objeto de observação há séculos. Para a ciência florestal e também para a ecologia, a importância de se estimar a idade de uma árvore é de enorme relevância. Essas informações podem determinar, por exemplo, o ciclo de corte de determinada espécie, o melhor regime de desbastes e com isso pode...

Equations to estimate tree gaps in a precision forest management area the amazo...

Alternative criteria to achieve sustainable management of Mezilaurus itauba in ...

The aims of this study were to evaluate the Brazilian law parameters for tropical forest management regarding forest recovery and to propose alternative criteria to achieve sustainability, using Mezilaurus itauba (Meisn.) Taub. ex Mez as case study. The diameter structure was obtained from a 100% forest inventory of a 500 ha forest compartment. The assessment of M. itauba growth, ingrowth and mortality were car...

Twenty years monitoring growth dynamics of a logged tropical forest in Western ...

We performed a forest growth dynamics study in Acre State, Brazilian southwestern Amazon, where a 20 ha area was logged in 1992. The study was based permanent sample plots (1 ha) established in the logged area and in an unlogged forest immediately after logging operations finished. Forest dynamics parameters were assessed in terms of aboveground dried biomass (AGB). During the study period, three extreme climat...

Criteria to be considered to achieve a sustainable second cycle in Amazon Forest

Remnant forest structure and increment by diameter class play a decisive role in the recovery volume for the next cutting cycle. Tree species in the Amazon Forest do not present a defined pattern of diameter structure, which is discussed here using Cedrela odorata L. as a case study The aim of this study was to identify, by simulation, recovery from logging in a real situation at three timber production sites, ...

MANEJO DE PRODUÇÃO EM FLORESTAS NATURAIS DA AMAZÔNIA: MITOS E VERDADES

O manejo de florestas naturais é o único uso da terra que garante a manutenção da floresta. O número de árvores remanescentes atinge 88%. Apesar disto, é uma atividade penalizada na mídia como responsável pela destruição ou deterioração das florestas naturais. Além disso, pesquisas sobre manejo de florestas naturais, principalmente na Amazônia, muitas vezes se apoiam nestes mitos, produzindo pesquisas pontuais ...