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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.2019.tde-20191218-162802
Document
Author
Full name
Nils Joachim Wehr
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1998
Supervisor
Title in Portuguese
Caracterização dos anéis de crescimento de árvores de Araucaria angustifolia (Bert.) O. Ktze, através da microdensitometria de raios X
Keywords in Portuguese
CRESCIMENTO
DENDROCRONOLOGIA
MICRODENSITOMETRIA DE RAIOS X
PINHEIRO
Abstract in Portuguese
O presente trabalho teve como objetivo a caracterização dos anéis de crescimento de árvores de araucária da técnica de microdensitometria de raios X. Árvores de araucária pertencentes a 3 classes de diâmetro - dominantes, co-dominantes e dominadas - com 25 anos, foram cortadas de uma plantação da espécie, localizada no município de Arapoti-PR. Além da medição das suas dimensões e da arquitetura das copas, foram coletados discos de madeira na região basal do tronco e preparados para a obtenção de filmes de raios X e análise por microdensitômetro. Os resultados obtidos permitiram (i) confirmar a idade das árvores através da análise das radiografias e dos gráficos de gradiente de densidade no sentido medula-casca; (ii) avaliar a variação dos valores médios das densidades máxima, mínima e média dos anéis de crescimento; (iii) determinar a variação dos valores da largura e da densidade dos lenhos inicial e tardio; iv) obter valores de densidade média da madeira e (v) relacionar a morfologia externa das árvores, principalmente a arquitetura de suas copas, com as características dos anéis de crescimento. No trabalho são discutidos os resultados obtidos com os apresentados na literatura para a araucária com outras metodologias de análise de anéis de crescimento e de parâmetros de qualidade da madeira. São, também, apresentadas, as aplicações da metodologia de densitometria de raios X em araucária para a dendrocronologia, manejo florestal, dinâmica das populações florestais, dentre outras.
Title in English
Characterisation of the trees ring grouth woodg of Araucaria angustifolia (Bert.) O. Ktze, applyng the x-ray microdensitometry
Abstract in English
The present work has as its aim the characterisation of the grouth rings from araucaria trees applyng the X-ray microdensitometric method. Araucaria trees of to 3 diameter categories - dominated, co-dominated and supressed - with 25 years, were cutted of a plantation from this species located, in Arapoti-. Parana, Brazil. Beside the measurement of the dimention and architecture of the tree crown, wood discs were also collected at the below part of the stem, near the ground, and prepared to take X-rays films to be in analised in the microdensitometer. The purchase results allowde: (i) confirmation of the tree age by the analysis of X ray film and density profile to pith to the bark; (ii) evaluate the mean value of the densities of the maximum, minimum and mean of the tree grouth rings; (iii) determine the width variation and the warly and latewood density; (iv) obtain the wood mean density and (v) correlte the canopy of the trees, particularly this architecture, with the tree grouth rings characteristics. ln this work was discussed the results with those one presented in the literature about araucaria, with other methodologies of tree ring grouth ring analisys and wood quality parameters. Also, was presented the application of the X-ray densitometric methods on araucaria for dendrochronology, forestry management , forestry dynamics, etc.
 
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Publishing Date
2019-12-19
 
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