调减木材产量对伊春市林产工业及相关产业的影响及相关对策

通过对伊春林区的深入调查研究,分析了调减木材产量后对林产工业及相关产业的影响,并提出了相应的对策。

林业资源型城市经济转型模式分析及选择

通过对林业资源型城市的发展历程、特点及所面临的现实问题,采用数学分析方法,对林业资源型城市转型的调控手段、转型路径等几种模式进行了分析论证,对林业资源型城市实现转型的可能性、可行性进行了一些探索。

伊春市恐龙地质遗产资源状况及评价

阐述了地质遗迹及古生物化石价值表现的四个方面,分析了伊春恐龙地质资源的分布情况和状况,并对如何利用恐龙地质资源进行了论述。

装配式人防地下车库预制构件施工技术

济南市某地下车库采用预制装配式混凝土框架结构。地下装配式建筑的建造方式深化了装配式建筑的优势,突出了地下建筑体量大、标准化程度高、易施工等特点。实践证明装配整体式框架结构承载力高、刚度大、延展性好、造价低且建造速度快。

THE NATURAL REGENERATION PATTERN AND PROCESS OF KOREAN PINE POPULATION UNDER NATURAL POPLAR-BIRCH FOREST IN XIAOXING'AN MOUNTAINS

According to a great deal of field investigation and detailed indoor analysis, the natural regeneration pattern and process of Korean pine poputation under natural Poplar-birch forest has been uncovered. The results show that the regeneration quantity and quality of Korean pme population under mountamous Poplar-birch forest and mountamous white birch forest are better than those under valley moss-grass White Bireh forest and virgin broad-leaved Korean pine forest. Korean pine population shows aggregated distribution, the mass-oceurrence period of Korean pine populalion is behind the mass-occurrence period of Poplar-bireh population. Various aged Korean pines growth is affected by different stand structure factors. Man-made lighting tending can accelerate the regeneration process and inercase the regeneration quality of Korean pine population. It is feasible to set up regeneration recombination of upper layer White Birch and lower layer Korean pines.