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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
04/01/1993 |
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Data da última atualização: |
18/03/2025 |
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Autoria: |
ZOBEL, B. E.; THORBJORNSEN, E.; HENSON, F. |
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Título: |
Geographic, site, and individual tree variation in wood properties of loblolly pine. |
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Ano de publicação: |
1960 |
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Fonte/Imprenta: |
Silvae Genetica, v. 9, p. 149-176, 1960. |
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Idioma: |
Inglês |
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Conteúdo: |
Loblolly pine (P. t'asda L.), a species of high commercial value, has a wide geographic range and grows under many different site and environmental conditions. Its morphological and physiological characteristics have been observed in a general way to vary considerably, both regionally and locally, throughout its natural range. The observed variation has led to both speculation and effort concerning the possibility of finding and breeding improved strains of loblolly pine. The feasibility of breeding trees for wood properties has been discussed without much unanimity for many years. Scome have expressed opinions similar to KOEHLER'S (1939) that wood is a,, conservative character," and that it gives small hope for discovering pronounced inherent wood differences between varieties, races and strains of a species. Others have been more optimistic about breeding for wood properties and have looked forward to the time when,, strains" with special wood could be developed (SCHREI-NER, 1935). SCHÜTT (1959) analyzes briefly the potential development of trees with different woods through natural selection. One thing is clear, however;-before genetic studies of wood properties can be efficiently undertaken, the variation pattern from tree to tree, site to site, as well as throughout the range of the species, must be known. In addition, the interrelationships among the various wood characteristics and growth factors need to be determined. The present study was initiated to determine the extent of variation in several wood properties in seven southeastern states in which this species is important. It concerns the variation patterns of specific gravity, tracheid length and cellulose yields. It also includes some characteristics of a tree that can affect wood properties, such as growth rate and compression wood. Tracheid wall thickness and tracheid diameter are currently being investigated, althoug'h results are not yet available. It must be emphasized that the variations studied are phenotypic and nothing is known about the genotypes of the trees from which wood samples were taken. Research results should be interpreted in that light. MenosLoblolly pine (P. t'asda L.), a species of high commercial value, has a wide geographic range and grows under many different site and environmental conditions. Its morphological and physiological characteristics have been observed in a general way to vary considerably, both regionally and locally, throughout its natural range. The observed variation has led to both speculation and effort concerning the possibility of finding and breeding improved strains of loblolly pine. The feasibility of breeding trees for wood properties has been discussed without much unanimity for many years. Scome have expressed opinions similar to KOEHLER'S (1939) that wood is a,, conservative character," and that it gives small hope for discovering pronounced inherent wood differences between varieties, races and strains of a species. Others have been more optimistic about breeding for wood properties and have looked forward to the time when,, strains" with special wood could be developed (SCHREI-NER, 1935). SCHÜTT (1959) analyzes briefly the potential development of trees with different woods through natural selection. One thing is clear, however;-before genetic studies of wood properties can be efficiently undertaken, the variation pattern from tree to tree, site to site, as well as throughout the range of the species, must be known. In addition, the interrelationships among the various wood characteristics and growth factors need to be determined. The present study was initiated to determine the ... Mostrar Tudo |
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Palavras-Chave: |
Pine. |
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Thesagro: |
Madeira; Pinus Taeda. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02661naa a2200181 a 4500
001 1279808
005 2025-03-18
008 1960 bl uuuu u00u1 u #d
100 1 $aZOBEL, B. E.
245 $aGeographic, site, and individual tree variation in wood properties of loblolly pine.$h[electronic resource]
260 $c1960
520 $aLoblolly pine (P. t'asda L.), a species of high commercial value, has a wide geographic range and grows under many different site and environmental conditions. Its morphological and physiological characteristics have been observed in a general way to vary considerably, both regionally and locally, throughout its natural range. The observed variation has led to both speculation and effort concerning the possibility of finding and breeding improved strains of loblolly pine. The feasibility of breeding trees for wood properties has been discussed without much unanimity for many years. Scome have expressed opinions similar to KOEHLER'S (1939) that wood is a,, conservative character," and that it gives small hope for discovering pronounced inherent wood differences between varieties, races and strains of a species. Others have been more optimistic about breeding for wood properties and have looked forward to the time when,, strains" with special wood could be developed (SCHREI-NER, 1935). SCHÜTT (1959) analyzes briefly the potential development of trees with different woods through natural selection. One thing is clear, however;-before genetic studies of wood properties can be efficiently undertaken, the variation pattern from tree to tree, site to site, as well as throughout the range of the species, must be known. In addition, the interrelationships among the various wood characteristics and growth factors need to be determined. The present study was initiated to determine the extent of variation in several wood properties in seven southeastern states in which this species is important. It concerns the variation patterns of specific gravity, tracheid length and cellulose yields. It also includes some characteristics of a tree that can affect wood properties, such as growth rate and compression wood. Tracheid wall thickness and tracheid diameter are currently being investigated, althoug'h results are not yet available. It must be emphasized that the variations studied are phenotypic and nothing is known about the genotypes of the trees from which wood samples were taken. Research results should be interpreted in that light.
650 $aMadeira
650 $aPinus Taeda
653 $aPine
700 1 $aTHORBJORNSEN, E.
700 1 $aHENSON, F.
773 $tSilvae Genetica$gv. 9, p. 149-176, 1960.
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Registro original: |
Embrapa Florestas (CNPF) |
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