共查询到10条相似文献，搜索用时 171 毫秒
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Differences in wood properties between juvenile wood and mature wood in 10 species grown in China 总被引：3，自引：0，他引：3
F. C. Bao Z. H. Jiang X. M. Jiang X. X. Lu X. Q. Luo S. Y. Zhang 《Wood Science and Technology》2001,35(4):363-375
This study examined the intrinsic differences in various wood properties between juvenile wood and mature wood in 10 major
reforestation species in China. Comparisons between juvenile wood and mature wood were made in both plantation- and naturally-grown
trees. Considerable differences in most wood properties were found both between plantation-grown juvenile wood and mature
wood, and between naturally-grown juvenile wood and mature wood. This suggests that wood properties of plantation-grown trees,
to a large extent, depends on their juvenile wood contents, and can thus be manipulated effectively through rotation age.
In general, the longer the rotation age, the lower the juvenile wood content, and the stronger the mechanical properties of
the plantation-grown woods. However, the differences between juvenile wood and mature wood vary with wood properties and species.
In general, juvenile wood and mature wood have less difference in chemical composition than in anatomical and physico-mechanical
properties. Compared to the softwoods studied, the hardwoods appear to have less difference between juvenile wood and mature
wood.
Received 25 June 1999 相似文献
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木材科学与技术研究新进展 总被引：1，自引：0，他引：1
吴义强 《中南林业科技大学学报(自然科学版)》2021,(1):1-28
木材作为世界四大基础材料中(钢铁、水泥、塑料、木材)唯一的可再生资源,广泛应用于家具、建筑、能源、新材料等领域,与人们的生活息息相关,已成为国民经济重要支柱产业.从木材微观分子生物学到宏观木结构,再到新型木质纳米材料进行全面阐释,对于木材科学与技术领域的基础理论研究和重大核心技术突破具有重要指导意义.木材科学与技术已发... 相似文献
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随着天然林保护工程的实施 ,我国木材资源结构正在进行由主要利用天然林木材到利用人工林木材的转变 .由于人工林木材所含幼龄材比例相当高 ,木材资源结构的变化反过来必将对我国的木材加工工业及林产品工业带来一系列影响 .该文综述了我国木材资源的现状 ,比较了人工林幼龄材与天然林成熟材的木材基本特性 ,探讨了人工林木材性质特征与营林培育的关系 ,阐述了木材质量与不同最终用途之间的关系 ,并对加强开展人工林木材性质的研究提出了几点建议 相似文献
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木材碳学是近年来兴起的一门科学, 其主要研究内容包括木材碳素的储存量、木材储能、人工林木材固碳增汇与优质木材培育技术及木质产品固碳延伸等方面。文中简述了木材碳学研究中木材固碳量与含碳率、木材固碳量的影响因素、木材固碳量与木材热值的关系以及木质材料固碳量和固碳延伸等方面的研究现状, 并对今后的研究方向进行了展望。 相似文献
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世界木材科学研究现状与我国的发展战略 总被引：3，自引：0，他引：3
文章论述了木材科学在林业科学和国民经济建设中的地位和作用, 介绍了国外木材科学基础研究的现状及发展趋势.作者对我国木材科学研究现状和存在的问题进行了分析, 并提出了我国木材科学的发展对策和木材科学基础研究的7个重点领域. 相似文献
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The consumption of wood and wood products in Greece is based greatly on imports necessitating every year a great proportion of public expenditures. The study of wood and wood product imports consequently, is important to the national economy and can be a useful guide for the forest farms, wood industries and wood firms. In this paper the Greek aggregate import demand for Unprocessed wood (such as logs) Processed wood (such as sawn wood), Veneer Crafts (such as veneer sheets) and Wood Manufactures during the period 1969–2001 is empirically analysed using the linear approximation of quadratic AIDS (QUAIDS) model. Imports of Unprocessed wood, Veneer Crafts and Wood Manufactures are found to be price-elastic, in contrast to Processed wood imports. Processed wood, Veneer Crafts and Wood Manufacture imports are found to be expenditure-elastic while Unprocessed wood is found to be an inferior good. Substitution possibilities are found to be significant between Veneer Crafts and all the remaining wood imports and between Processed wood and Unprocessed wood. 相似文献