长柄双花木生长发育生物学特性的观察研究

通过对长柄双花木历时2a的观察研究，掌握了该树种生长发育生物学特性的一些规律，为保护该树种的种质资源和开发利用提供参考。     

顶坛花椒育株和不育株的形态鉴别和结构研究

分析和比较了顶坛花椒育株和不育株在营养器官形态和结构上的区别。结果表明:育株茎颜色浅紫色,皮刺基部呈圆锥形,叶面油腺点数多于不育株,叶片下表皮气孔器周围细胞排列较不育株规则;不育株茎颜色淡绿色,皮刺基部呈棱锥形,刺尖较育株短,绒毛的分布较育株多而密,茎中分泌腔数多于育株,下表皮气孔器数量明显多于育株。     

南方红豆杉的繁殖技术

本文介绍了南方红豆杉的种子繁殖和扦插繁殖两种方法,简单有效、容易掌握.     

南方红豆杉扦插繁殖试验

对南方红豆杉扦插繁殖试验结果表明，选择中径级母树，在其树冠中、上部采取具顶芽的穗条、剪成长30－35cm的插穗，于1－2月扦插，能显著提高扦插成活率。     

嫩江沙地樟子松人工林各测树因子数量关系的研究

在对嫩江沙地樟子松人工林生物量调查的基础上,采用回归分析的方法模拟了林龄与胸径、树高和生物量之间以及胸径、生物量与树高之间的数量关系,建立了樟子松林分各器官生物量回归方程,结果表明:林龄与胸径、树高和生物量相关紧密;采用W=aebD模型,地上生物量、树干、树枝、树根的回归方程的相关系数都达到了极显著水平,平均拟合率都大于70%。     

Natural Mongolian Pine Forests in the Great Xing''''an Mountains,Northeast China

1 Introduction The Great Xingan Mountains in the northeast of China is covered by boreal forests. Larch (Larix gmelinii) represents the most frequent tree species. Mongolian pine (Pinus sylvestris var. mongolica) can be found on about 3% of the forested land. Pine forests contain the most valuable timber, which is harvested on large areas and transported to southern regions. Within these forests, few studies exist about the flora, the distribution of the dominating tree species, and their…     

毛红椿播种育苗技术及苗期生长规律研究

于2005-2006年对毛红椿的播种育苗技术和苗期生长规律进行观测研究,结果表明,毛红椿于3月下旬播种,4月上旬出苗,7月下旬至9月中旬苗木高生长最快,9月中旬以后进入缓慢生长,至10月底苗木停止生长,其高生长量可达100 cm以上,最高可达150 cm;21、27、33、45株/m2 4种留苗密度实验表明,苗木地径生长与留苗密度密切相关,留苗越密则地径越小、高度越小,留苗越稀则地径越大、高度越小。生产上建议播种量为15 kg/hm2,留苗密度以30~33株/m2为宜。     

中国葛属种质资源及在园林绿化中的应用

在对我国葛属植物的种类和分布、生态环境和生物学特性进行详细介绍的基础上，就其在园林绿化中的作用、繁殖方法和栽培技术进行了系统的研究。     

南方红豆杉扦插育苗试验简报

通过采用单层遮阳网加塑料薄膜小拱棚、双层遮阳网和双层遮阳网加塑料薄膜小拱棚3种试验类型对南方红豆杉扦插育苗对比试验，结果表明，采用双层遮阳网加塑料薄膜小拱棚成活率为最高，达85％。     

Wheat cultivation in association with Acacia nilotica (L.) Willd ex. Del. field bund plantation — a case study

The paper presents the results of a case study conducted to find out the influence of single row bund plantation of Acacia nilotica var. juquemontii on the growth and yield of associated wheat crop under irrigated conditions in Haryana, India. The indications are that the tree line does affect all crop parameters like height growth, shoot numbers, ear length, grain number and grain yield in the vicinity of trees upto 4 m distance from the tree line and establishes that as the distance from the tree line increases the growth and yield of wheat crop also improves. The effect on wheat crop was found more pronounced in the plots laid out towards the middle of the tree line as compared to plots towards the outer border.