公路景观设计

介绍了公路沿线景观结构及景观设计的组成，并由此得出做好公路景观设计是公路设计不可分割的重要组成部分。     

松针褐斑病初步研究

松针褐斑病的病原菌为Ｉｅｃａｎｏｓｔｉｃｔａ ａｃｉｃｏｌａ，在病叶上或叶上的病了实体和病组织中的菌丝体是初侵染源。侵染期主要在５月上旬至６月中旬。病原菌通过雨水的溅散主风力而传播。在发病初期采用百菌清可湿性粉剂和托布津农药喷液及人工摘病叶的进行防治，均能收到一定效果。     

采用Pci软件处理遥感影像研究

为了提高森林资源二类调查质量,辽宁省改变传统的地形图调绘方法,利用法国Spot5 分辨率为10 m多光谱数据与分辨率2.5 m全色数据进行融合后的遥感影像作为二类调查调绘的图面资料。利用Pci图像处理软件对spot5 10 m、2.5 m影像进行几何精校、正射校正(orthoengine)、融合处理(xpace)以及对融合后的遥感影像增强、拉伸、亮度、对比度的调整完成spot5的影像处理过程。     

武夷山风景名胜区内部服务网点调查分析

采用实地调查和问卷调查相结合的方法,对武夷山风景名胜区的内部服务网点设置和使用情况进行了调查分析,总结了景区内服务网点建设中存在的问题,并提出相应的解决对策,可为武夷山风景名胜区的内部服务网点的合理规划设计提供参考。     

浙江第一古樟就地保护措施研究

通过对浙江第一古樟的生长现状调查、生长影响因素分析,提出了古樟保护与景点建设相结合,筑堤保树与改路保树、拆庙护树相结合,以低水位人工湖指示地下水位高度,通过泵提排水控制古樟地下水位等古樟就地保护的具体措施。     

Direct plant regeneration from nodal explants of <Emphasis Type="Italic">Balanites aegyptiaca</Emphasis> L. (Del.): a valuable medicinal tree

This report describes in vitro shoot induction and plant regeneration from nodal segments of Balanites aegyptiaca on Murashige and Skoog (MS) medium fortified with 6-benzyladenine (BA), thidiazuron (TDZ) and kinetin (Kin) (0.5–20.0 μM). MS medium supplemented with BA (12.5 μM) was the most effective in inducing bud break and growth and also in initiating multiple shoot proliferation. However, the optimal level of TDZ supplementation to the culture medium was 5.0 μM. Shoot cultures were established by repeatedly subculturing the original nodal explants on the same medium. Highest number of shoots (11.5 ± 0.7) and shoot length (5.0 ± 0.2 cm) were achieved when cultures were subcultured on MS medium supplemented with 12.5 μM BA and 1.0 μM α-naphthalene acetic acid (NAA). The shoots regenerated from TDZ supplemented medium when subcultured to hormone free MS basal medium considerably increased the rate of shoot multiplication and shoot length by the end of fifth subculture. Rooting of the shoots was achieved on MS medium augmented with 1.0 μM indole-3-butyric acid (IBA) plus 0.5% activated charcoal followed by their transfer to half strength MS basal medium. The in vitro raised plantlets with well developed shoots and roots were successfully established in earthen pots containing garden soil and were grown in greenhouse with 70% survival rate. The results of this study provide the first successful report on in vitro direct plant regeneration of B. aegyptiaca.     

森林火行为与特殊火行为研究进展

森林火灾主要包括地表火、地下火、树冠火3种蔓延形式。目前火蔓延模型主要关注于森林地表火的蔓延研究, 对一些特殊的火行为, 如树冠火、火旋风、飞火等研究极为薄弱, 而这些火行为在特大森林火灾的蔓延传播中起着重要作用, 往往加速火蔓延, 并对扑火人员造成生命危险。我国森林大多集中在山区, 火灾一旦发生, 由于复杂的地形、不均匀的可燃物分布、多变的局地风和林火的相互作用, 极易形成复杂的火行为。文中对森林火灾中的火行为和特殊火行为进行了论述, 讨论了当前的研究进展和未来发展趋势。     

影响非洲菊离体培养器官分化的因素

采用非洲菊的 4个不同切花品种 ,主要通过对花托外植体进行离体培养 ,从基因型、激素组合、基本培养基、蔗糖质量浓度等方面研究了非洲菊器官形成的规律。结果表明 :幼小的花托是非洲菊最适宜培养的外植体。虽然品种之间存在着差异 ,但在 2个月内均能从愈伤组织上直接产生不定芽。芽的产生以IAA 0 1mg/L及BA 10mg/L为最佳激素配比 ,而基本培养基诱导芽分化的效果是B5>1/ 2MS >MS ,1%蔗糖较之高质量分数蔗糖更有利于芽的分化。     

水黄皮叶斑病的成因、严重性及杀菌剂防止

对孟加拉国4个苗圃(IFES、IFESCU、BFRI和ANC)内水黄皮叶斑病症状和严重性进行了调查,结果表明:IFESCU苗圃内叶斑病侵染率及致病指标最高、BFRI次之、ANC最低.与叶斑病相关联的组织从发病植株分离出来,被分离的真菌形成致病性.结果证实胶孢炭疽菌即为致病菌.观察了杧果炭疽病菌丝体生长抑制性并对杀菌剂(Bavistin, Cupravite and Dithane M-45) 有效性和浓度(0.05, 0.10, 0.50, 1.00, 1.50 和 2.00%)进行了鉴定.0.05% Bavistin和Cupravite潜伏8天后,菌丝体生长分别处于最低和最高水平.结果表明:Bavistin杀菌效果最好、Diathane M-45次之,Cupravite对菌丝体生长的抑制作用最低.图1表4参27.     

The severity and cause of leaf spot disease of Pongamia pinnata L. and fungicidal control of the pathogen

A survey on the symptom and severity of the leaf spot disease of Pongamia pinnata L. was conducted in the nurseries of the Institute of Forestry and Environmental Sciences, University of Chittagong （IFESCU）, Bangladesh Forest Research Institute （BFRI） and Aronnak Nursery in Chittagong. The highest infection percentage and disease index were found in IFESCU nursery, followed by BFRI and the lowest was recorded in Aronnak nursery. The associated organism of leaf spot disease of P. pinnata was isolated from the diseased plant parts and the pathogenicity was established with the isolated fungus. Colletorichum gloeosprioides Penz was proved to be pathogenic. The inhibition of mycelial growth of C. gloeosporioides was observed and identified as suitable fungicides （Bavistin, Cupravite and Dithane M-45） and doses （0.05, 0.10, 0.50, 1.00, 1.50 and 2.00）. The lowest and highest mycelial growth were respectively found on Bavistin and on Cupravite at the concentration of 0.05 after 8th day of incubation. It indicates that out of the three tested fungicides, Bavistin showed most effective, followed by Diathane M-45, and Cupravite was ineffective for its very little inhibition on mycelial growth.