The results showed that the growth of root tips in liquid medium was better than that in agar - solidified medium and solid - liquid two phase medium , for that increasing agar concentrations in medium will reduce the root growth ; darkness was beneficial for fraxinus mandshurica root tip culture in vitro ; as the carbon sources , sucrose was better than glucose and maltose as the carbon sources , and 3 % sucrose was best for the root tip growth of fraxinus mandshurica 结果表明,不添加琼脂的液体培养基对根尖的生长较添加琼脂的固体培养基和固液培养基好,原因是增加琼脂的量会抑制根的生长;暗培养比光培养更有利于水曲柳离体根尖的培养;蔗糖作为碳源的效果较果糖和麦芽糖好,其中以3 %的蔗糖对离体根尖的生长效果最好。
It has luxuriant forest here with various of rare trees such as korean pine , spruce , manchurian ash , birch , oak an linden , etc . all kinds of wild plant and officinals such as ginseng , dengshen , acanthopanax , fruit of chinese magnoliavine , etc . large amount of mountain delicacies such as an edible fungus , hedgehog , mushroom , brake , etc . abundant mineral resources such as gold , copper , iron , dolomite and limestone , etc 这里有林木繁茂,生长着红松、云杉、水曲柳、桦木、柞木、椴木等多种珍贵树木;野生药用植物种类繁多,人参、党参、刺五加、五味子极为丰富;山特产品质优量大,有木耳、猴头、蘑菇、蕨菜、刺嫩芽等,地下资源有金、铜、铁、白云石、石灰石等矿藏。
The study has investigated and compared soil physical , chemical , biochemical properties of eight stands on paired sites in mountainous regions of northeastern china , trying to look for the mechanism of soil degradation and the change trend of soil properties in different age of plantations in relations to forest productivity . the eight stands are 4 first rotation of larix olgensis plantations with different age classes , the second rotation of larix olgensis young stand , pinus sylvestris var 本文通过固定和典型样地,对东北山地不同生长发育阶段落叶松人工林和二代落叶松幼龄林以及与二代落叶松幼龄林同一块林地的樟子松幼龄林、天然次生林、落叶松水曲柳混交林等8个林型土壤质量进行了对比与分析,深入探讨了落叶松人工林土壤质量降低的机理和不同发育阶段土壤质量变化规律以及与森林生产力变化的关系,并提出了林地土壤质量调控措施。
Base on discuss , choosing mongolian scotch pine and manchurian ash as experiment species , using three kinds of wood fire - retardant treatment methods which included soaking at some pressure , pressurized soaking under ultrasonic wave and the pressurized soaking under ultrasonic wave after treated by microwave , the result is that ultrasonic wave may apply in wood fire - retardant treatment production 在讨论的基础上,以樟子松和水曲柳为木材试样,选择压力浸渍、超声波加压浸渍和微波处理后超声波加压浸渍3种木材阻燃处理方法,经过试验,说明在生产阻燃木材的浸渍方法中引入超声波技术是可行的。