西双版纳竹楼的发展

竹楼——云南少数民族竹文化的体现，具有浓郁的民族特色和不断发展变化的历史。随着经济的发展和人民生活水平的提高，竹楼文化也经历困难的发展阶段。作者基于竹类植物所具有的特性，分析和探讨了新型傣族竹楼建筑的优缺点，期待西双版纳竹楼在当地经济、社会发展中发挥更重要的作用。     

Electrophysiological and Behavioral Responses of Adult Anoplophom glabripennis (Motschulsky) to Volatile Components of Host-Plant

Electrophysiological and behavioral responses of adult A. glabripennis (Motsch.) to volatiles from ashleaf maple (Acer negundo L.) were investigated to identify semiochemicals involved in host location. Measurable electroantennogram (BAG) responses were elicited to all compounds tested, the most effective antennal stimulants were trans-2-hexen-1-al,decyl aldehyde and trans-2-hexenl-ol.These profiles were similar between males and females. In Y-tube olfactometer bioassays, above three compounds with certain concentration, trans-2-hexen-l-al (1%), trans-2-hexen-l-ol (1%) and decyl aldehyde (10%), were significantly attractive to the adults in laboratory. The results show that either BAG or olfactory responding to a particular volatile compound are markedly influenced by the concentration.     

论我国生态林业建设方略

目前我国的生态林业建设面临着许多问题。我们必须以全新的理念进行体制创新、制度创新、所有制结构创新,以实现林业生产关系的变革,最大限度地解放林业生产力,以超常规的方式推进中国林业跨越式发展。文章借鉴国内外林业经营理论的研究成果,对于我国生态林业的建设,提出并阐述了“地类规划、分类经营,区别对待、统筹协调,完善政策、产业化发展”的方略。     

沙化土地信息提取研究

采用LandsatETM 多时相影像,在地类光谱特征分析的基础上,用分层分离的方法,提取出沙化土地信息。以全国沙漠化普查地类划分标准中的植被覆盖度为确定沙化土地程度的依据,通过建立NDVI和实测植被覆盖度的回归模型,确定不同程度沙化土地对应的植被覆盖度与NDVI的对应关系,用NDVI阈值进行划分,得到沙化土地程度图。     

豆科树种无性快速繁殖技术研究与进展

豆科树种目前已广泛应用于荒山绿化、饲用及观赏。文中从扦插(嫩枝扦插、硬枝扦插、根插)，组织培养等方面综述了豆科树种无性快速繁殖技术的研究和进展。指出目前豆科树种嫩枝扦插技术研究还局限在对某一树种繁殖途径的探索阶段；硬枝扦插技术研究较为系统和深入，对不同树种扦插生根的影响因素有了比较深入的了解，并因此建立起较为成熟的技术体系；根插方法简单，成活率高，但是研究普遍较少；豆科树种组织培养虽较为困难，但某些树种也已经建立起了较为完善的再生体系。此外，还对豆科树种快速繁殖的生理基础研究进行了讨论，建议加大对豆科树种快速繁殖技术和生理机制的研究力度，为解决优良种质资源快速扩繁奠定基础。     

Thermal diffusion in Masson pine wood

In order to analyze the effects of the temperature gradient on moisture movement during the highly intensive microwave-vacuum drying, thermal diffusion of Masson pine wood was studied. Internal distribution of temperature and moisture in Masson pine samples sealed by epoxy resin and aluminum foil was measured, the magnitude of thermal diffusion was calculated and the influencing factors of thermal diffusion were discussed. Results showed that with the transfer of moisture toward the low temperature in wood, opposite temperature and moisture gradient occurred. The initial moisture content （MC）, temperature and time are important factors affecting this process; the thermal diffusion is in proportion to wood temperature, its initial moisture and time. The temperature and distance from hot surface is strongly linearly correlated, and the relationship between MCs at different locations and distance from the hot end surface changes from logarithmically form to exponentially form with the increase in experimental time.     

2.5cm栎木地板毛坯的快速干燥新方法

采用干球温度不变、湿球温度连续下降的干燥新工艺对２．５ｃｍ 栎木地板毛坯用炉气间接加热木材干燥窑进行快速窑干试验，结果表明干燥周期较常规窑干燥缩短了４０％，锯材干燥质量良好，干燥基准操作方便。     

阔叶红松林倒木贮量动态研究

本文研究了中国吉林省长白山区阔叶红松林倒木贮量的动态变化规律。阔叶红松林倒木贮量包括其现有倒木及其年输入量等贮量的变化规律。阔叶红松林现有倒木贮量开始为16.25 t·hm-2,以后随时间减少,到100年分解掉其干重的85%左右,300年后所剩无几。倒木年输入量平均约为0.6 t·hm-2,其贮量是随时间而增加,200年后稳定在31 t·hm-2,可保持到该群落的顶级时期。倒木总贮量的变化在初期呈增加趋势,而后随着现有倒木的完全分解,倒木贮量就与其倒木的年输入趋于一致,最后稳定在上述水平上。图4表2参9。     

Load behaviors of a prefabricated wood framing house during lifting and transportation

Lifting for handling and flatbed truck transportation to the job site are important processes during manufacture of prefabri-cated wooden construction units like mini homes and building modules. Significant damage can occur to sections or components of units during these operations. Although damage usually will not impair its structural safety, it is costly to fix and causes the public to perceive prefabricated wooden buildings as low quality products. Field observations and preliminary numerical models for prefabri-cated units subject to lifting and transportation forces are summarized here. Once fully developed and verified, models will support the creation of damage mitigation strategies centered on structural details indicating how units are to be supported during lifting and transportation.     

白蜡树属树种的园林应用探讨

目前对城市环境的要求越来越高,而提高环境质量的诸因素中,搞好园林绿化是最直接最有效的措施。构成园林绿化的主要材料是园林植物,其主体是树木。作为1个城市,当然是园林树木品种越多,越能构成丰富多彩的园林空间。但是由于地域、气候、科技、经济与自然因素和人为因素的制约,园林树木品种的利用也受到了限制。园林树种的选择不仅要适合本土生长,还要形成地方特色和风格。