The Effects of Different Intensities of Pruning on the Growth of<i>Pinus radiata</i>in South Africa

Lange, P. W.; Ronde, C. de; Bredenkamp, B. V.

doi:10.1080/00382167.1987.9630298

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Quando adequadamente programada e conduzida, a desrama artificial melhora substancialmente as propriedades físicas da madeira, principalmente por reduzir nós vivos e mortos (PIRES, 2000;PULROLNIK, 2002;VALE et al, 2002;ALMEIDA, 2003;POLLI et al, 2006). No entanto, a desrama artificial promove alterações na copa das árvores, por remover parte da biomassa da base da copa (galhos e folhas) (PULROLNIK, 2002;LIMA, 2003;ALMEIDA, 2003), podendo comprometer o crescimento das plantas, principalmente quando reduz drasticamente sua superfície fotossintetizante (LANGE et al, 1987;PINKARD e BEADLE, 1998;REIS et al, 2001). Povoamentos de eucalipto manejados para a produção de madeira de qualidade, através da desrama artificial, devem ser desbastados para a obtenção de árvores com maior diâmetro, aumentando a eficiência no desdobramento das toras.…”

Section: Introductionunclassified

Dinâmica de cobertura de dossel de povoamento de clone de Eucalyptus grandis W. Hill ex-Maiden submetidos a desrama artificial a desbaste

Chaves

Reis²,

Reis³

et al. 2007

Rev. Árvore

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989RESUMO -A dinâmica de copa foi avaliada através do índice de área foliar (IAF), transmitância da radiação fotossinteticamente ativa (t%) e índice de cobertura do dossel (ICD), entre 55 e 68 meses de idade, em povoamentos de clone de Eucalyptus grandis desramados entre 16 e 45 meses de idade até a altura de 6 m. Esses povoamentos foram submetidos a desbaste (0 e 35% do número total de mudas plantadas), aos 55 meses de idade, em Abaeté, MG. Não foi observada diferença significativa (P≥0,05) entre os tratamentos de desrama, para IAF, t% e ICD, entre 55 e 68 meses de idade, em razão da elevada capacidade de recomposição de copa desse clone. Porém, observou-se mudança significativa (P≤0,05) nesses parâmetros entre as idades de avaliação, e houve redução de IAF e ICD e aumento de t% imediatamente após o desbaste, tendo havido pronta recomposição da copa seis meses após o desbaste, nas três idades de primeira intervenção de desrama. Aos 68 meses de idade, o IAF e o ICD do povoamento desbastado foram significativamente (P≤0,05) maiores, enquanto t% foi significativamente menor do que do povoamento não-desbastado. Os resultados de IAF e t% indicaram que essas informações podem ser utilizadas para avaliação da dinâmica de copa, sendo os dados de IAF mais consistentes do que os de t%. A utilização de fotografia digital apresenta potencial para avaliar a dinâmica de cobertura do dossel, em razão de ser um método de uso fácil e barato, embora ainda requeira aperfeiçoamentos.Palavras-chave: Índice de área foliar, transmitância da radiação fotossinteticamente ativa e fotografias digitais. DYNAMIC OF CROWN COVER OF Eucalyptus grandis W. Hill ex Maiden CLONE STANDS AFTER PRUNING AND THINNING ABSTRACT -Crown dynamic based on leaf area index (LAI), photosynthetic active radiation transmitancy (t %) and crown cover index (CCI) of

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Section: Introductionunclassified

Dinâmica de cobertura de dossel de povoamento de clone de Eucalyptus grandis W. Hill ex-Maiden submetidos a desrama artificial a desbaste

Chaves

Reis²,

Reis³

et al. 2007

Rev. Árvore

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“…A living crown of about 50% of the tree height should be left in order to avoid reduced tree growth. It has been noted that the pruning of one or two lowest living whorls of branches can even increase the growth of a tree (e.g., Vuokila 1976, Lange et al 1987, Giefing et al 2004, since the energy efficiency of the lowest living branches can already be negative. However, normally pruning slows down the height and diameter increment for some years, depending on the proportion of green branches pruned (Heiskanen 1958, Vuokila 1976, Kannisto and Heräjärvi 2006.…”

Section: Introductionmentioning

confidence: 99%

Influence of saw and secateur pruning on stem discolouration, wound cicatrisation and diameter growth of Betula pendula

Schatz¹,

Heräjärvi²,

Kannisto³

et al. 2008

Silva Fenn.

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The aim of this case study was to compare the impacts of saw and secateur pruning on silver birch (Betula pendula Roth). Data were collected from two saw pruned stands in 2005, and one secateur pruned stand in 2003. All the stands were located in southern Finland. The sample stems were felled, and their butt logs were sawn into flitches, whose knot features and colour defects were measured. In addition, discs were sawn from each stem in order to study the annual ring widths. In this material, pruning with secateurs appeared to cause less colour defects than pruning with a saw. Irrespective of the pruning method used, the colour defects in the stem wood were at their largest in cases where the basal knob or the stem bark appeared to be damaged by pruning. Colour defects spread mainly towards the pith, only in a few cases towards the stem surface. The cicatrisation time of the knots as well as the length of the bark stick remaining inside the stem did not show significant differences between the two pruning methods. Pruning of the lowest living branches appears to have no effect on the diameter growth of silver birch trees.

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“…The amount of canopy left on a tree after pruning affects light interception, and therefore the impact of pruning on dbh growth (Bandara et al 1999;Lange et al 1987;Sutton & Crowe 1975). However, as trees have tapered stems, leaving more canopy results in a larger DOS in the next lift, given the same delay for the next lift, and DOS size should be consistent between pruning lifts to promote reasonable PLIs while not incurring needless loss in growth (Figure 12).…”

Section: Pruning In Several Liftsmentioning

confidence: 99%

Impacts of tending on attributes of radiata pine trees and stands in New Zealand – a review

Mason

2023

NZJFS

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Background: Radiata pine (Pinus radiata D.Don) has been grown in New Zealand’s plantations for more than a century, and silviculturists began by employing Eurocentric ideas about how to manage forest stands. Research and development gradually led to an entirely new approach to silviculture, where volume production was sacrificed to promote value, and high investments in individual trees led to very low stand stockings by international standards. Methods: The development of pruning and thinning technology was reviewed, highlighting the most important developments, and identifying impacts of tending on tree and stand attributes. Results: Decision-support systems for planning pruning and heavy, early pre-commercial (waste) thinning became very sophisticated. As ideas changed, however, structural regimes without pruning became more prevalent, and this has necessitated new forms of silvicultural research. Ideas for new areas of tending research in New Zealand are outlined. Conclusions: A unique approach to tending plantations developed in New Zealand that involves sacrificing volume production to increase the value of an investment in pruned forest stands. Experiments aimed at building decision-support systems for these silvicultural regimes have yielded a great deal of information about impacts of pruning and thinning in stands with relatively open canopies. Recent changes in focus towards growing construction lumber require a greater research focus on factors influencing wood stiffness and stability as well as a clear understanding of the use of higher stocking levels with a variety of genotypes on a range of sites. Stand dynamics and mortality will be more relevant than for pruning regimes, and a variety of new experiments is required.

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The Effects of Different Intensities of Pruning on the Growth ofPinus radiatain South Africa

Cited by 6 publications

References 5 publications

Dinâmica de cobertura de dossel de povoamento de clone de Eucalyptus grandis W. Hill ex-Maiden submetidos a desrama artificial a desbaste

Dinâmica de cobertura de dossel de povoamento de clone de Eucalyptus grandis W. Hill ex-Maiden submetidos a desrama artificial a desbaste

Influence of saw and secateur pruning on stem discolouration, wound cicatrisation and diameter growth of Betula pendula

Impacts of tending on attributes of radiata pine trees and stands in New Zealand – a review

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