四倍体刺槐嫩枝插穗生根的解剖学观察

通过对四倍体刺槐嫩枝插穗扦插前和扦插后的切片观察,结果表明:(1)在插穗的切口处有愈伤组织,在愈伤组织内未发现产生根原基;(2)四倍体刺槐嫩枝茎内无潜伏根原基,不定根由诱生根原基发育形成,诱生根原基源于髓射线细胞的分裂和分化。     

Effects site conditions on industrial fiber plantations of Lar/x olgensis

Plot sampling was conducted in the second cultivation areas ofLarix olgensis in Heilongjiang Province, China. By analyzing plot investigation data, wood properties, and kraft pulps of 840 plots and 248 sample trees in industrial plantations of L. olgensis on different sites, we examined the growth process of L. olgensis industrial plantation with suitable structure, the wood fiber feature, chemical composition, physical performance and pulp characteristics. It is suggested that site conditions have major effects on plantation growth, fiber contains, fiber length, rate between fiber length and fiber width, pulping rate and pulp physics intensity. The best site for L. olgensis industrial plantation growth is site class Ⅰ and site class Ⅱ, which are on lower locations. Site condition has an obvious influence on the wood characteristics. Within the range of site conditions and stand densities studied, the worse the site condition, the less the fiber contains, the shorter the fiber length, and the more the 1% NaOH extraction. This kind of relationship becomes more obvious as stand age increases. However, the influence of site condition on pulping rate and pulp physics intensity is not obvious. The result provides theoretical base for cultivation of industrial fiber plantation of L. olgensis.     

会同生态定位研究站科研信息管理系统的研制

MIS与 GIS结合应用于生态定位研究是一个较好的具有扩展性的解决生态数据量大、统计繁琐的解决方案 ,能实现生态定位研究的管理规范化、现代化、自动化和网络化 ,更好地为生态系统定位研究服务 .阐述了会同生态定位研究站信息管理系统的设计和开发过程 ,介绍了系统的结构和功能 ,并对地理信息系统应用于生态定位研究作了一定的探讨     

尾叶桉组织培养快速繁殖的研究

以顶芽或茎段为外植体 ,通过 4种基本培养基和生长调节剂不同浓度组合的对比试验 ,筛选出最佳增殖培养基为B1+2 0mg·L-16 -BA +1 0mg·L-1NAA ,生根培养基为B2 +0 5mg·L-1ABT1号。移栽基质选择红心土。     

如皋市双条杉天牛的发生及综合防治

对双条杉天牛从形态特征、生物学特性、寄主范围、危害率等方面进行了调查，并提出了防治双条杉天牛的对策和措施。     

乌兰布和沙漠抗逆植物选择试验及利用

乌兰布和地区光，热，水，土资源丰富，在国家开发西北地区的大政策下，适合进行农，林，牧业开发，但是限于本地区干旱，少雨，风沙大的现状，开发要在以改善生态环境为目的的防护林建设的基础上进行，为本地区增选抗性强，生长快，见效快的灌木品种是当务之急，也是长远需要，本试验选取了干旱地区常见的8种沙旱生灌木进行造林实验，选择出最适于该地区生长的灌木品种主造林方式。     

Slash pine (Pinus elliottii Engelm.) somatic embryogenesis I. Initiation of embryogenic cultures from immature zygotic embryos

Immature female gametophytes and enclosed zygotic embryos of slash pine (Pinus elliottii Engelm.) collected at various developmental stages were cultured either on eight initiation media supplemented with different plant growth regulator (PGR) combinations or on LPM medium solidified with two brands of agar. Embryonal-suspensor cell masses extruded from gametophyte explants infrequently produced white or translucent mucilaginous embryogenic cultures. Variation in extrusion frequency was observed across seed sources (families), explant collection dates, agar types and culture media. Increased explant maturity (as related to collection dates) reduced cell extrusion rates. Four types of extrusions were grouped according to their morphology. One type of extrusion produced the greatest number of established and long-surviving embryogenic cultures. This extrusion type (type I) was associated with an extrusion condition termed empty in which the entirety of the embryonal-suspensor mass was extruded out of the gametophyte. Three other extrusion types (types II, III and IV) showed less culture establishment and survival.     

桉树人工林木材生长应变研究

以我国南方生长较好的4种人工林桉树为研究对象，测试并比较了4种桉树立木的纵向生长应变及其相关性,结果表明：不同桉树种间生长应变差异显著；相同树龄的尾园桉的生长应变与胸径成直线相关。以上结果可为桉树实体木材的加工利用提供借鉴。     

我国竹产业商机无限

中国竹产业经过 2 0多年的迅猛发展已形成了一个由资源培育、加工利用到出口创汇的新兴产业。1999年 10月 18日至 2 0日 ,’99中国竹文化节在湖南省益阳市举行。来自 2 5个国家和地区的 170 0多名政府官员、竹产业专家和客商云集益阳 ,总结经验 ,交流信息 ,共商 2 1世纪的竹产业发展大计。专家们指出 ,竹产业正在迎来大发展的良好时机 ,“以竹代木”是我国社会发展的需要 ,其市场广阔、商机无限。随着我国实施天然林保护工程的启动 ,随着 1999年 8月对长江上游三峡库区以上和黄河上中游小浪底水库以上的 13个省 (区 )实行天然林全面禁伐措施…     

山桐子育种苗期试验初报

育苗试验结果表明，山桐子在亚热带地区能正常生长发育，其种子发芽需经过去蜡处理。在塑料薄膜棚内，约需40d才能形成幼苗。苗期生长呈慢——快——慢的曲线变化规律，11月生第趋于停止。1年生苗高78-112cm，平均86.6cm；根径1.1-1.7cm，平均1.5cm。