Prevalence and incidence of the root-inhabiting fungi, Fusarium, Cylindrocarpon and Pythium, on container-grown Douglas-fir and spruce seedlings in British Columbia

Surveys were made at the end of the 1990 and 1991 growing seasons for root-inhabiting fungi in the genera Fusarium, Cylindrocarpon and Pythium from the roots of one year-old container-grown Douglas-fir and spruce seedlings grown under greenhouse conditions. In the 1990 survey of four nurseries, it was found that 61–97% of both Douglas-fir and spruce roots were colonized with Fusarium, Cylindrocarpon or Pythium. There were significantly (p0.05) more Douglas-fir roots than spruce roots colonized by Fusarium at all nurseries, however, there were significantly (p0.05) more spruce roots than Douglas-fir roots colonized by Cylindrocarpon and Pythium. Root colonization of Douglas-fir and spruce by the three fungal genera during 1991 varied from 0–82% at three nurseries, however, only at a south coastal nursery was there significantly (p0.05) more spruce than Douglas-fir roots colonized by Cylindrocarpon. Significantly more seedlings were infected in 1990 than in 1991. In 1991, there were few significant differences between Douglas-fir and spruce, in the percentage of seedlings with colonized roots and in the percentage of growth medium colonized by the fungi. However, there were significant differences between nurseries.     

广东林木种苗工程项目资金使用管理的问题与对策

概述了广东省林木种苗工程项目资金使用与管理现状,分析了其存在的主要问题,并提出解决问题的相关建议。     

太行山区侧柏大规格容器移栽育苗造林成效对比试验

在太行山石质山区采用不同规格容器袋进行侧柏育苗造林对比试验,结果表明,在3月份采用1年生大田裸根苗移栽到13cm×2 0cm的大规格容器内培育10 0～110天后,在7～8月份雨季上山造林,保存率比小规格播种容器(6. 4cm×15cm)苗提高10 %左右。     

河北省林木种苗发展现状、趋势与管理对策

总结了河北省林木种苗建设取得的成绩及存在的问题，根据林业和生态建设的新形势及河北省种苗发展现状，分析了林木种苗发展的趋势，提出了河北省林木种苗管理的总体思路和“坚持一个中心，抓好两件大事，建设三大体系，抓好四项工作”的管理对策。     

Blight of conifer seedlings caused by Colletotrichum gloeosporioides

In a growth chamber experiment, 70-day-old seedlings of 10 conifer species were inoculated with Colletotrichum gloeosporioides conidia to determine the host range of the fungus. Based on the percentage of seedlings affected and the disease severity on individual seedlings, the order of most to least susceptibility was: western hemlock (WH), mountain hemlock, western larch, Sitka spruce, Engelmann spruce, Douglas-fir (coastal form, then interior form), white spruce and ponderosa pine; lodgepole pine and western red cedar remained unaffected. Inoculation of WH needles showed that within 24 h C. gloeosporioides conidia germinate and appressoria (penetration structures) form. A growth chamber study demonstrated that the pathogen can infect WH at needle wetness periods as short as 15 min; number of needles affected was higher at 0.5 h, but did not increase further even when wetness was extended up to 8 h. The results are discussed in relation to blight management of greenhouse-grown conifer seedlings.Portion of a Bachelor of Science (Honors) thesis, Department of Biology, University of Victoria, Victoria, British Columbia.     

杉木组培无根苗瓶外生根试验

运用正交试验设计探讨了基质、愈伤组织和ABT对杉木组培苗生根的影响。结果表明:基质、愈伤组织和ABT对杉木组培苗的生根率产生显著影响,最佳组合为:基质用红心土∶河砂(3∶1)+愈伤组织部分切除+ABT1#300 mg.L-1。     

濒危植物沙冬青人工种群建立技术

建立人工种群是保护荒漠珍惜濒危植物沙冬青、扩大沙冬青种质资源、建立种质基因库的根本途径。播种苗移植造林和直播造林是建立沙冬青人工种群的2种途径。在干旱沙区，如何提高移栽成活率是沙冬青移植造林中最大的技术难题，而直播造林往往受到土壤水分条件的限制。试验从两条途径入手，通过田间对比试验，探试了不同浓度的ABT生根粉(3号)、苗木截体处理和苗龄对沙冬青苗木移植成活率及其生长状况的影响，试验总结了在年降水量小于150mm的干旱沙区进行沙冬青大田育苗的各个技术环节，同时对沙冬青直播造林中种子处理、馅播技术和人工种群的抚育管理也进行了一定的试验和探讨。     

南瓜茶饮料不同风味加工技术研究

研究了以南瓜为原料，经热水2次浸提（1kg南瓜：4000ml水）所得南瓜母液，每100ml母液添加14g白沙糖、0.18g柠檬酸的甜酸型南瓜茶饮料和每100ml母液添加14g白砂糖、0.2g柠檬酸、0.09g食用盐配方而成的复合风味南瓜茶饮料的生产技术。     

改进马尾松育苗方法的试验

对马尾松采用控制苗木密度、芽苗截根移栽和接种菌根菌等技术进行育苗试验，结果表明：苗木密度应控制在１５０株／ｍ２，芽苗截根以保留主根长度１／２为宜；采用厚环乳牛肝菌进行人工接种效果较好。     

杨树苗木萌动后造林对成活率的影响

春季杨树苗木枝叶萌动后进行栽植,直接影响造林成活率,萌动时间愈长,造林成活率越低,所以,春季营造杨树,应选择在苗木萌动前栽植。