The comparative result shows that the physical and mechanical properties of wood between white wood of Dahurian larch (Larix gmelini (Rupr.) Rupr.) and Mangolian scotch pine (Pinus cylvesthe var. mongolica) are differ...The comparative result shows that the physical and mechanical properties of wood between white wood of Dahurian larch (Larix gmelini (Rupr.) Rupr.) and Mangolian scotch pine (Pinus cylvesthe var. mongolica) are different Some differences are very conspicuous,(e. g. compressivc strength parallel to grain, modulus of elasticity in static bending, toughness and bending strength etc. ),and others are slightly conSPicuous or not conspicuous,(e.g. shrinkage, differential shrinkage and shearing strength parallel to grain etc.). The properties of white wood of Dahurian larch are suitable weight and soft texture, median strength,median shrinkage and good in worability, while which of Mongolian scotch pine are light and soft nearly very soft,weak strength, median shrinkage are good in workability. However, the white wood of Dahuran larch is superior to the Mongolian scotch pine in Strength-to-weight ratio.It is a valuable timber tree.展开更多
Dahurian larch growing in Daxing’an Mountains can be divided into two types according to the wood colour: one is red, the other is white. Based on the national standard of the "Testing methods for physical &...Dahurian larch growing in Daxing’an Mountains can be divided into two types according to the wood colour: one is red, the other is white. Based on the national standard of the "Testing methods for physical &mechanical properties of wood", the parameters of wood colour and physico-mechanical properties of the above two different woods were tested and analyzed.The result showed that the colour rational phenetic parameters, physico-mechanical properties and work abilities of thc two woods were quite different, combincd with the other morphological characteristics, they belong to intraspccific two different types of Dahurian larch. The white wood is superior to the red one as a valuable timber tree. Because the cocfficients of shrinkage, hardness and colour of both are different, they were mixed working in the past, inevitably there have been various defects in working. In order to overcome these defects, we propose that the departments of wood production, salesmen and consumers should use them differently according to their individual character.展开更多
报道了兴安落叶松一个变型——白材兴安落叶松〔Larix gmelinii(Rupr.)Rupr.f.chlorocarpa(Miyabe et Miyake)P.H.Huang et L.H.Zhuo〕.其与原变型主要区别在于幼球果绿色或淡绿色,木材淡黄白色.在相同的条件下,其生长优于原变型.在木...报道了兴安落叶松一个变型——白材兴安落叶松〔Larix gmelinii(Rupr.)Rupr.f.chlorocarpa(Miyabe et Miyake)P.H.Huang et L.H.Zhuo〕.其与原变型主要区别在于幼球果绿色或淡绿色,木材淡黄白色.在相同的条件下,其生长优于原变型.在木材力学品质因数中,它有比较高的抗弯强度、顺纹抗压强度、冲击韧性和抗弯弹性模量.它的木材强重比高,硬重适中.加工性能较好,使用范围较广,很适用于家具、地板块、室内装饰、门、窗和胶合板等,其利用价值优于原变型.因此,它是林业生产上选育推广的一个速生、优质的类型.展开更多
文摘The comparative result shows that the physical and mechanical properties of wood between white wood of Dahurian larch (Larix gmelini (Rupr.) Rupr.) and Mangolian scotch pine (Pinus cylvesthe var. mongolica) are different Some differences are very conspicuous,(e. g. compressivc strength parallel to grain, modulus of elasticity in static bending, toughness and bending strength etc. ),and others are slightly conSPicuous or not conspicuous,(e.g. shrinkage, differential shrinkage and shearing strength parallel to grain etc.). The properties of white wood of Dahurian larch are suitable weight and soft texture, median strength,median shrinkage and good in worability, while which of Mongolian scotch pine are light and soft nearly very soft,weak strength, median shrinkage are good in workability. However, the white wood of Dahuran larch is superior to the Mongolian scotch pine in Strength-to-weight ratio.It is a valuable timber tree.
文摘Dahurian larch growing in Daxing’an Mountains can be divided into two types according to the wood colour: one is red, the other is white. Based on the national standard of the "Testing methods for physical &mechanical properties of wood", the parameters of wood colour and physico-mechanical properties of the above two different woods were tested and analyzed.The result showed that the colour rational phenetic parameters, physico-mechanical properties and work abilities of thc two woods were quite different, combincd with the other morphological characteristics, they belong to intraspccific two different types of Dahurian larch. The white wood is superior to the red one as a valuable timber tree. Because the cocfficients of shrinkage, hardness and colour of both are different, they were mixed working in the past, inevitably there have been various defects in working. In order to overcome these defects, we propose that the departments of wood production, salesmen and consumers should use them differently according to their individual character.
文摘报道了兴安落叶松一个变型——白材兴安落叶松〔Larix gmelinii(Rupr.)Rupr.f.chlorocarpa(Miyabe et Miyake)P.H.Huang et L.H.Zhuo〕.其与原变型主要区别在于幼球果绿色或淡绿色,木材淡黄白色.在相同的条件下,其生长优于原变型.在木材力学品质因数中,它有比较高的抗弯强度、顺纹抗压强度、冲击韧性和抗弯弹性模量.它的木材强重比高,硬重适中.加工性能较好,使用范围较广,很适用于家具、地板块、室内装饰、门、窗和胶合板等,其利用价值优于原变型.因此,它是林业生产上选育推广的一个速生、优质的类型.
