共查询到20条相似文献，搜索用时 250 毫秒
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红铁木豆类
红铁木豆类有3种,俗称红檀。树种均为苏木科（Caesalpliniaceae）。
1．马达加斯加铁木豆
木材特征：散孔材。心边材区别明显。心材红褐至紫褐色,径切面具深浅相间条纹。边材浅褐色。轴向薄壁组织弦向带状及轮界状。结构细而匀。纹理交错。气干密度中。波痕可见。新剖面略有气味。略有光泽。主要产地：非洲赞比亚、喀麦隆、津巴布韦。 相似文献
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为给香合欢（Albizia odoratissima）木材的利用提供理论参考,以25年生香合欢为研究对象,采用光学显微镜对其主要解剖性质进行分析。结果表明,香合欢木材边材和心材区别明显,边材为黄白至黄褐色,心材为深褐色、巧克力色,常有暗红褐色条纹。木材生长轮明显;散孔材。管孔稍大,分布略均匀,每平方毫米2～4个。导管横切面为圆形及卵圆形;导管分子单穿孔,圆形及卵圆形;穿孔板略平行及略倾斜,管间纹孔式互列。轴向薄壁组织呈环管束状、翼状、稀聚翼状和轮界状;菱形晶体数多。木射线非叠生;每毫米3～6根。单列射线少,多列射线平均宽为27.7μm,平均高为299.0μm,属于稍细和极低射线。香合欢木材构造与格木（Erythrophleum fordii）木材相似。弦切面上倒“V”字或山水状花纹明显,花纹的轮廓线为暗栗褐色;径切面为暗栗褐色条纹。径切面银光纹理不可见,射线斑纹可见。在实际生产中,采用弦切和径切板制作家具板面均美观。 相似文献
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本文介绍了落叶栎属中的辽东栎、栓皮栎，以及槲树的木材解剖构造与材性测试结果。三种栎木均属环孔材，心边材明显，木射线较宽，薄壁细胞发达，容积重较高，干缩系数也较大，强度指标较高，属于高强度的木材，其中辽东栎的纤维细胞较长，侵填体发达，早晚材的导管直径差异小，顺纹抗拉力最大，栓皮栎的容积重较其它二种为高，干缩系数的差异也较大。 相似文献
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本文对五种落叶类栎木进行木材构造的现象，及其物理－力学性质的测试，结果表明：五种栎木均为环孔材，心边材区别明显，木射线较宽，薄壁细胞发达，其中麻栎晚材管孔呈单孔排列，早晚材导管的直径差异小，并具有傍管带状薄壁细胞，纤维致密，容积重较大，五种栎木的力学强度和品质数都较高，其中，麻栎的静曲强度和干缩系数最大，白栎的顺纹抗压强度和硬度最大。 相似文献
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指出了大果紫檀(Pterocarpus macrocarpus)为豆科紫檀属树种,香脂木豆(Myroxylon spp.),蝶形花科香脂木豆属的木材。从宏观特征和微观特征两方面对大果紫檀与香脂木豆这两种木材进行了比较研究,并总结了导管孔、薄壁组织、射线、水浸液、香味5种构造差异。 相似文献
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对降香黄檀及市场上5种假冒降香黄檀木材进行了取样及实验室解剖,查阅了相关书籍资料,对降香黄檀及假冒木材的树木性状、木材构造特征、材性和用途进行了描述,从木材宏观和微观构造的角度浅析了降香黄檀与假冒木材之间的天壤之别,其结果表明:降香黄檀木材具有独特的辛辣香气,而5种假冒树种均无特殊气味;肉眼下,5种假冒木材与降香黄檀相似,其纹理和色泽均多变,鬼脸或不规则花纹均可见;肉眼下,降香黄檀弦切面具明显波痕,而5种假冒木材均无波痕;微观下,降香黄檀导管、木射线、轴向薄壁组织均叠生,而5种假冒木材均不叠生。以期望为大众提供识别依据。 相似文献
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《广西林业科学》2021,50(3)
为给杏(Armeniaca vulgaris)木的合理利用提供理论支持,利用生物数码显微镜对杏木的宏观和微观特征进行观察与分析。结果表明,杏木边材为黄红色至黄褐色,心材为红褐色和灰褐至带红的浅黄褐色;心、边材区别明显。环孔材;早材管孔宽1～3(稀4)列;晚材管孔为单管孔及径列复管孔(2～3个),少数呈管孔团,散生或斜列;单穿孔,穿孔板倾斜;管间纹孔式互列;未见侵填体;早材和晚材管孔螺纹加厚明显。木纤维壁薄,具缘纹孔较多。木射线非叠生,射线组织异形Ⅱ型,少数为Ⅲ型;单列射线高1～18个细胞或以上;多列射线宽2～8个(多数为2～6个)细胞,高8～64个细胞或以上。生长轮外缘具创伤树胶道。杏虽为进化树种,但保留了部分原始形状特点,说明杏的进化是不同步的。杏木的结构与生长环境相适应。 相似文献
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Katri Luostarinen Katja Hakkarainen Henri Kaksonen 《Scandinavian Journal of Forest Research》2017,32(8):789-797
Soil affects the anatomy of downy birch wood (Betula pubescens), which raises the question whether the growth of this species differs between mineral and peat soils. The aim of this study was to compare growth, density and structure of xylem of B. pubescens between trees grown in different soils. Both growth and density differed between trees grown in different soils. All measured anatomical characteristics, except double thickness of fibre walls, percentage vessel area and ray number, showed differences between the soil types: the cell dimensions were larger and numbers smaller in trees grown in mineral soil. In peat, high growth rates decreased the wall:lumen ratio of fibres in maturing wood, while no such correlation was observed in trees grown in mineral soil at any studied cambial age. In addition, axial parenchyma may have a different role in trees grown in different soils, as the rapid growth decreased and increased axial parenchyma in mineral and peat soil, respectively. The characteristics affecting wood strength were more similar between trees grown in different soils than those affecting water conductance. The observed differences between trees grown in different soils emphasise rapid growth particularly at young ages and shorter reasonable rotation period in mineral soil. 相似文献
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Radial variation of wood properties in Neolamarckia cadamba trees from an East Java community forest
《Southern Forests》2013,75(4):351-359
Radial variations in wood properties, cell morphologies and cell proportions were investigated for nine 4-year-old Neolamarckia cadamba trees planted in a community forest in East Java, Indonesia. The relationships between stem diameter and wood properties, cell morphologies or cell proportions were determined to ascertain the effects of stem diameter on these properties. In the radial variations, almost all of the wood properties, cell morphol- ogies and cell proportion in N. cadamba were changed at around 4 to 6 cm distance from the pith, except for fibre diameter, and the proportion of fibre and axial parenchyma. For trees with larger stem diameter, the vessel diameter was also found to increase. In addition, the ray parenchyma and cell wall proportions in trees with larger stem diameter were lower than those in trees with smaller stem diameter. However, the wood properties obtained from the larger stem diameter trees did not always show lower values. The wood properties in N. cadamba were correlated to fibre wall thickness and vessel diameter. 相似文献
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Dries Vansteenkiste Joris Van Acker Marc Stevens Didier Le Thiec Gérard Nepveu 《Annals of Forest Science》2007,64(1):11-19
SEM and light-microscopical observations, supported by chemical microanalysis with an EDXA system, revealed that light-saturated pixels observed in X-ray negatives of sessile oak (Quercus petraea Liebl.) wood were caused by inorganic deposits present inside multiseriate ray and axial parenchyma cells. Calcium oxalate crystals, silica grains and amorphous granules with varied mineral compositions have been identified. The wood strips of three out of six sampled trees contained measurable amounts of mineral inclusions which were quantified using image analysis. Based on the variations of mineral content observed between trees and within and between annual rings of the same tree, some hypotheses were formulated concerning the factors involved in the formation of inorganic deposits in oak wood. Their occurrence varies depending on the mineral concerned and seems to be controlled largely by a tree effect. The time of formation appears to coincide with a shifting of the oak wood’s functions as a result of heartwood formation processes (inter-annual scale) or changes in leaf phenology and climate (intra-annual scale). In addition, the technical consequences of their presence as well as their effects on wood density measurements through microdensitometry are discussed. 相似文献
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Guillermo Riesco Muñoz Marcos Barrio Anta 《European Journal of Forest Research》2010,129(6):1037-1045
Forty young trees from a stand of maritime pine in the southern mountains of Galicia, Spain (42°21′N: 8°01′W) were felled
to obtain the material required for studying density and shrinkage in clear and small wood specimens. The wood ranged from
light to moderately heavy, and the dimensions remained reasonably stable with varying moisture content. The results were consistent
with those obtained in previous studies of adult trees, except for axial shrinkage, which was very high and variable in this
study. The between-tree variation in wood properties was high considering that the sampled trees came from the same stand.
However, the relationships between density and height in the stem were similar in all trees. A general model for the prediction
of volumetric shrinkage was developed, with oven-dry density and ring width as predictor variables. The model is feasible
for estimation of wood quality in living trees. It is applicable to tree selection for thinning and for genetic improvement
of stock. 相似文献
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根据各种木材的干燥特点，研究设计木材干燥装置，以满足各种树种、规格木材的干燥要求。通过木材干燥装置的应用研究，分析了各种装置的干燥特点，以提高木材干燥质量。降低干燥能耗。 相似文献
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四川盆地西缘湿性常绿阔叶林区木本植物区系研究 总被引：1，自引：1，他引：0
在调查的基础上,结合有关文献和植物标本资料,对生态地位极其重要的四川盆地西缘湿性常绿阔叶林区的木本植物区系进行了分析研究。结果表明：该区木本植物丰富,有111科440属l559种,317亚种、变种和变型,其中蕨类植物1科1属1种;裸子植物8科18属30种;被子植物102科421属l845种。该区具有占主导地位的大科,拥有大量属种,但大部分科内属、种贫乏,以热带性质的科占优势;该区440属可划分为14个分布区类型和19个分布区变型,区系成分复杂;植物区系起源古老,珍稀濒危树木和特有木本植物繁多;热带成分稍多于温带成分,这与该区为常绿阔叶林地带以及该区所处的地理位置相吻合,也表明该区木本植物区系具有显著的过渡性。 相似文献
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方文彬 《中南林业科技大学学报(自然科学版)》2003,23(1):20-27
对湖南 19科 2 8属 3 4种主要阔叶树材的微观构造进行了研究 .结果表明 :单位面积管孔数及导管分子长度与管孔直径成反比 ;各种类型轴向薄壁组织所占比率 ,按从小到大排列顺序为轮界型 <傍管型 <离管型 ;按纤维长度分级 ,各级所占比率按从大到小排列顺序为中等 >长 >甚长 >极长 ;按宽度分级 ,各级所占比率按从大到小排列顺序为细 >中 >粗 >甚粗 ;纤维长宽比 >45 ;射线高度的变化规律是 ,单列、二列射线的木材所占比率 ,按从小到大排列顺序为环孔材 <半环孔材 <散孔材 ,多列射线的木材所占比率 ,按从小到大排列顺序为环孔材 <散孔材 <半环孔材 ;纤维微纤丝角度较小 相似文献
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Laguncularia racemosa wood is commonly used in north-western Mexico and harvested without the knowledge of whether environmental conditions affect wood quality.
Laguncularia racemosa anatomy variation was evaluated to identify which cell features, mainly fibre features, are related to an environmental gradient and how this variation affects wood quality. Trees were sampled in six sites along the river where different flooding periods and levels occur. Analyses revealed that in sites with high salinity and flooding levels, there are more abundant vessels and axial parenchyma although the fibres and vessel elements are shorter, suggesting a water stress effect. Correlation analysis confirmed that the higher the percentage of gelatinous fibres, the longer the fibres. This occurred in L. racemosa trees growing in those sites with a high sand particle percentage and a lower flooding level. Anova (analysis of variance) revealed non-significant differences among sites for flexibility, rigidity and Peteri coefficients as well as for Runkel ratio, however the rigidity coefficient is affected by occurrence of gelatinous fibres. L. racemosa wood harvesting should avoid those sites with high flooding level, high sand particle percentage and high salinity that may modify wood quality. 相似文献