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本文研究了桉属(Eucalyptus L’Her.)16种木材的显微结构。导管是从小到大变化的。最大弦径从栓皮桉的78μm 到巨桉的195μm。导管分子的平均长度从纤脉桉、梅县薄皮桉和合浦薄皮桉的0.26mm 到萄萄桉和伞房花桉的0.46mm。每平方毫米导管数目2到10。大部分导管都是单管孔,而且不同程度地排成斜向列。侵填体大都缺少,有的种丰富。桉树胶滴一般是缺少的,只有少数种中比较普遍。穿孔板均为单穿孔,并且主要是水平的。管间纹孔大部分是粗糙的,具缘的,附物的。轴向薄壁组织有傍管的和离管的两种类型。傍管的从少数与导管连接的如蓝桉很少,到广叶桉、巨桉中有丰富的环管状的。离管的在许多种中是罕见的,在另一些种中是星散的。在横切面上,每毫米射线的数目平均7到10根。在大部分种中,射线是由单列到2列,少数种中有3列的。多列部分最大局度最多达10个细胞。射线是弱的异形细胞射线,边缘的1到几列横卧细胞在垂直方向上比中间的细胞大。桉树胶滴一般比较丰富,有的聚集在中间的横卧细胞中。导管射线间纹孔是大的,半具缘的,具有圆的到椭圆的纹孔口。纤维平均长度的变化从锥果桉的0.68mm 到四川产的大叶桉的0.92mm。直径从广东产的大叶桉的9μm 到赤桉的16μm。纤维是不分隔的,在弦向和径向两个方向上一般都有具缘纹孔。纤维壁的厚度与腔的直径有关。纤维的壁一般是中等厚度到厚壁的,偶然也有薄壁的。在所有种中都有环管管胞,从稀少到丰富。产于我国广东和四川的与产于澳洲的同种相比木材组成分子一般略小些这可能与生态环境有关。
This paper studied the microstructure of 16 species of Eucalyptus L’Her. Catheter is small to large changes. The largest string diameter from the cortex Eucalyptus 78μm to Eucalyptus 195μm. The average length of the catheter molecules ranging from 0.26mm of Eucalyptus umbellatus, Meixian eucalyptus and Hepu eucalyptus to 0.46mm of Eucalyptus urophylla and Eucalyptus urophylla. The number of catheters per square millimeter is 2 to 10. Most catheters are single-hole, and to varying degrees, arranged in oblique columns. Till most of the lack of filling, and some species rich. Eucalyptus gum droplets are generally missing, only a few species are more common. Perforated plates are single perforations, and are primarily horizontal. Most of the pits between the tubes are rough, rimmed and attached. Axial parenchyma with tube and tube off the two types. Pond tube from a small number of connections with the catheter, such as blue eucalyptus few, to eucalyptus grandiflora, Eucalyptus has a rich ring tube. The tube is rare in many species and scattered in others. On the cross section, the average number of rays per millimeter is 7 to 10. In most species, rays range from single to two, with a few out of three. Multi-column part of the maximum degree of up to 10 cells. Rays are weakly shaped cell rays, with 1 to several rows of draping cells in the periphery that are larger in the vertical direction than cells in the middle. Eucalyptus drops generally rich, and some gathered in the middle of lying cells. Catheter ray interbores are large, semi-rimmed, with a round-to-oval stoma. The average fiber length varied from 0.68 mm in Eucalyptus urophylla to 0.92 mm in Eucalyptus grandis in Sichuan. Diameter from Guangdong Eucalyptus 9μm to Eucalyptus 16μm. The fibers are not separated and generally have a marginal pitted hole in both the chord and radial directions. The thickness of the fiber wall is related to the diameter of the cavity. The walls of the fibers are generally medium-thick to thick-walled, occasionally thin-walled. There are loop tube cells in all species, from scarce to plentiful. Produced in China, Guangdong and Sichuan and Australia produced the same species of wood components generally slightly smaller which may be related to the ecological environment.