桉树

Learning and studying the advanced technologies and experiences of eucalypt wood utilization from other countries, the utilization le...

通过学习和借鉴国外桉树木材加工利用的先进技术和经验，以提高我国桉树木材的利用水平。

This paper reviews the status of resources and utilization of wood from eucalypt plantation abroad from the viewpoints of eucalypt resources, wood properties, processing technologies and market development.

摘 要：从桉树人工林的资源现状、桉树人工林的木材性质、加工利用技术以及桉树木材产品的市场发展4个方面，概述了国外桉树人工林的发展及其木材利用状况。

Of this, eucalypt plantations account for 170,000 ha, and hence Zhanjiang now has the largest eucalypt resource of any city in China and some have even called it the "Eucalypt Kingdom" of China.

经过10多年的持续经营，湛江已发展桉树17万公顷，成为中国最大的桉树生产基地，被誉为"桉树王国"。

Learning and studying the advanced technologies and experiences of eucalypt wood utilization from other countries, the utilization level of eucalypt plantation in China will be promoted in the near future.

通过学习和借鉴国外桉树木材加工利用的先进技术和经验，以提高我国桉树木材的利用水平。关键词：桉树人工林，资源，木材，加工利用，市场发展

During 1995 and 1997,thesampling plots were established at Hetou Forest Farm of Leizhou Forest Bureau inGuangdong Province,where the field duties of this research were conducted.

桉树作为一个速生的外来树种，在我国华南地区得到了迅速发展，目前桉树人工林约有一半的栽培面积是连栽，但关于连栽对桉树人工林生产力的影响仅仅停留在宏观估测和表面的判断，尚未有具体数据方面的证据。

In particular, it likes to eat roses eucalyptus, eucalyptus and Mannan spot on the eucalyptus leaves.

它特别喜欢吃玫瑰桉树、甘露桉树和斑桉树上的叶子。

The results showed: the variance analysis of colour parameters among different species eucalypt wood are significant and the color index in heartwood is higher than that in sapwood.

摘 要：以五种桉树人工林木材为研究材料，用测色仪和氙衰减仪测试了五种桉树木材的颜色和耐光性，比较了这些桉树木材的颜色参数，结果表明：不同种类桉树木材材色参数之间差异显著，桉木心材部分的色品指数和色饱和度高于边材；桉木的耐光性随氙灯照射时间的增加而逐渐变差。

The results showed that there existed variation among eucalypt families in wood physical-mechanical properties and wood chemistry. There were significant differences among E.pellita families、E.grandis families and E.urophylla譋.grandis clones in wood colors as well as between Strains and within trees.The variation of the surface wetability of wood between E.grandis families and E.urophylla譋.grandis clones were significant.Even in the same families level or clones level,there still existed the same regulation. The degree of collapse of eucalypt had a large relation in the amount of tylosis in vessel and vestured pits on the cell wall of vessel. The more rich tylosis and vestured pits in vessels,the more probability to occur collapse for eucalypt.The biggest moment collapse was probably the critical point of the drying degrade.During the fomulation of drying technology,it is necessary to adopt moderate condition to make the vessels which had formed the biggest moment collapse at the biggest moment collapse resume,especially to prevent the permanent set.At the normal temperature level,the main factors which influenced residual collapse were the contents of ray parenchyma and axial parenchyma .Nearly all the cells joined the course of forming the moment collapse and biggest moment collapse.Interval drying was fit for eucalypt plantation which was easier to make collapse.

研究表明：桉树不同家系间木材物理力学性质和化学组成存在差异；粗皮桉家系间、巨桉家系间、尾巨桉无性系间材色存在显著差异，株间、株内木材材色存在变异；桉树木材表面润湿性在巨桉家系间、尾巨桉无性系间存在着显著差异，在同一家系或同一无性系中，株间和株内也存在着相同的变化规律；桉材皱缩程度与其导管中侵填体的多少和导管壁上纹孔具有的附物多少密切相关，侵填体含物越丰富，纹孔附物越多，桉材越容易皱缩；最大瞬间皱缩是能产生更大干燥降等的临界点，在制定干燥工艺时，必须在最大瞬间皱缩发生时，采用温和条件，使已产生最大瞬间皱缩的细胞尽可能多的恢复，尤其不能使其产生永久变定；在常温条件下，影响残余皱缩的主要因子是射线薄壁细胞和轴向薄壁细胞含量；而对于瞬间皱缩和最大瞬间皱缩，几乎所有细胞都参与它们的形成过程；对于易皱缩的桉树木材，间歇干燥是最有前途的干燥方法。

Ninety-one eucalypt taxa occur within the Greater Blue Mountains Area which is also outstanding for its exceptional expression of the structural and ecological diversity of the eucalypts associated with its wide range of habitats.

在大蓝山地自然保护区内共有91种桉树，从桉树的全球分布来看，在同一地区出现如此复杂的结构和生态多样性，对于桉树来说是非常罕见的。

This text utilize from domestic and international Timber Mountain Gum × Flooded Gum artificial resource current situation, processing of forest technology and Timber Mountain Gum × Flooded Gum market of product develop 3 respects, the development and timber which have summed up the domestic and international artificial forest of Eucalyptus utilize the state.

摘 要：本文从国内外桉树人工林的资源现状、加工利用技术以及桉树木材产品的市场发展3 个方面，概述了国内外桉树人工林的发展及其木材利用状况。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。