We assessed growth traits and wood properties ofDH32-29, a clone of Eucalyptus urophylla x E. grandis, at age of two to six years in Guangdong in China. Analysis of variance of studied traits showed that there were si...We assessed growth traits and wood properties ofDH32-29, a clone of Eucalyptus urophylla x E. grandis, at age of two to six years in Guangdong in China. Analysis of variance of studied traits showed that there were significant differences （1% level） on all studied traits among ages except for wood basic density. Analysis of age trends of growth traits and wood properties revealed that rotation length of DH32-29 should be more than six years or longer. Phenotypic correlations among traits at individual ages indicated that correlations between growth traits were strongly positive. There was significant change in relationship between growth and wood basic density with increasing age, ranging from -0.03 to -0.54 at 2 and 5 year and 0.003 to 0.3 at 3, 4 and 6 year. Correlations between Pilodyn pin penetration and basic density measured on increment cores showed that Pilodyn could rank or group genotypes or sites into density classes, but failure to predict individual tree and individual clone.展开更多
We studied two clones of Eucalypt urograndis hybrid （Eucalyptus grandis × E. urophylla）, GR283 and GR330, grown in Tumkur district of Kamataka （India）, and felled 5-6 years old three trees of each clone. We r...We studied two clones of Eucalypt urograndis hybrid （Eucalyptus grandis × E. urophylla）, GR283 and GR330, grown in Tumkur district of Kamataka （India）, and felled 5-6 years old three trees of each clone. We recorded axial variations in heartwood content, bark properties, wood density and anatomical characteristics of wood in- cluding fibre length, fibre diameter, fibre wall thickness, lumen diameter, vessel frequency, vessel diameter and vessel element length. Clone GR283 had about 10 % heartwood, significantly lower than for clone GR330 （37 %）. Basic wood density along the tree height varied significantly within and between the clones. We observed significant variations in fibre length, fibre diameter and wall thickness within and between the two clones. Vessel frequency and vessel element length did not vary but vessel diameter differed significantly between the clones. With a greater proportion of sapwood, clone GR283 can be uti- lized for paper and pulp applications. Clone GR330 had a higher proportion of heartwood and lower wood density and, hence, is more suitable for light-weight material applications.展开更多
桉树作为世界3大速生造林树种之一,生长迅速,轮伐期短,在制浆造纸、人造板和家具生产等领域被广泛应用,具有较高的经济、社会和生态效益。为了解桉树木材研究现状和发展趋势,采用文献计量法,以Web of Science数据库为文献来源,检索2011...桉树作为世界3大速生造林树种之一,生长迅速,轮伐期短,在制浆造纸、人造板和家具生产等领域被广泛应用,具有较高的经济、社会和生态效益。为了解桉树木材研究现状和发展趋势,采用文献计量法,以Web of Science数据库为文献来源,检索2011—2020年与桉树木材有关的文献,对相关数据进行统计分析,包括文献发表的年度数量变化、涉及学科和研究机构等,系统分析国际桉树木材的研究热点和趋势。结果显示,2011—2020年文献发表数量呈上升趋势;研究热点集中在细胞壁、赤桉、平衡、管理、生物炭、变异性、高温分解、热处理、密度、强度、含水率和木质素含量等方面;研究前沿主题包括生物炭、纳米复合材料、木质纤维材料、耐久性、化学变化/结构/性质、木材质量和热处理等。未来研究可能主要集中在木材的形成与质量、木材结构与材性、木材的高值利用和生物炭等方面。这为桉树产业及其桉树木材的研究利用提供借鉴和参考。展开更多
基金This study was undertaken as a project for National Key Technology R&D Program for the 12th Five-year Plan(China) "Breeding and Selection of New Variety with High Yield and High Resistance of Eucalyptus"(2012BAD01B04-1)Special Fund for Forestry Industry Research in the Public Interest "Project of Veneer Variety Breeding and Cultivation Model Optimization for Eucalyptus"(201104003-07)
文摘We assessed growth traits and wood properties ofDH32-29, a clone of Eucalyptus urophylla x E. grandis, at age of two to six years in Guangdong in China. Analysis of variance of studied traits showed that there were significant differences （1% level） on all studied traits among ages except for wood basic density. Analysis of age trends of growth traits and wood properties revealed that rotation length of DH32-29 should be more than six years or longer. Phenotypic correlations among traits at individual ages indicated that correlations between growth traits were strongly positive. There was significant change in relationship between growth and wood basic density with increasing age, ranging from -0.03 to -0.54 at 2 and 5 year and 0.003 to 0.3 at 3, 4 and 6 year. Correlations between Pilodyn pin penetration and basic density measured on increment cores showed that Pilodyn could rank or group genotypes or sites into density classes, but failure to predict individual tree and individual clone.
文摘We studied two clones of Eucalypt urograndis hybrid （Eucalyptus grandis × E. urophylla）, GR283 and GR330, grown in Tumkur district of Kamataka （India）, and felled 5-6 years old three trees of each clone. We recorded axial variations in heartwood content, bark properties, wood density and anatomical characteristics of wood in- cluding fibre length, fibre diameter, fibre wall thickness, lumen diameter, vessel frequency, vessel diameter and vessel element length. Clone GR283 had about 10 % heartwood, significantly lower than for clone GR330 （37 %）. Basic wood density along the tree height varied significantly within and between the clones. We observed significant variations in fibre length, fibre diameter and wall thickness within and between the two clones. Vessel frequency and vessel element length did not vary but vessel diameter differed significantly between the clones. With a greater proportion of sapwood, clone GR283 can be uti- lized for paper and pulp applications. Clone GR330 had a higher proportion of heartwood and lower wood density and, hence, is more suitable for light-weight material applications.
文摘桉树作为世界3大速生造林树种之一,生长迅速,轮伐期短,在制浆造纸、人造板和家具生产等领域被广泛应用,具有较高的经济、社会和生态效益。为了解桉树木材研究现状和发展趋势,采用文献计量法,以Web of Science数据库为文献来源,检索2011—2020年与桉树木材有关的文献,对相关数据进行统计分析,包括文献发表的年度数量变化、涉及学科和研究机构等,系统分析国际桉树木材的研究热点和趋势。结果显示,2011—2020年文献发表数量呈上升趋势;研究热点集中在细胞壁、赤桉、平衡、管理、生物炭、变异性、高温分解、热处理、密度、强度、含水率和木质素含量等方面;研究前沿主题包括生物炭、纳米复合材料、木质纤维材料、耐久性、化学变化/结构/性质、木材质量和热处理等。未来研究可能主要集中在木材的形成与质量、木材结构与材性、木材的高值利用和生物炭等方面。这为桉树产业及其桉树木材的研究利用提供借鉴和参考。
