【摘 要】
:
(一)柳毛河林场的大青杨生长特点及其培育柳毛河林场,是长白山林区我省临江林业局重点林场之一。它从一九六○年建场,共采伐木材七十一万立方米,出现采伐迹地七千三百一十六
论文部分内容阅读
(一)柳毛河林场的大青杨生长特点及其培育柳毛河林场,是长白山林区我省临江林业局重点林场之一。它从一九六○年建场,共采伐木材七十一万立方米,出现采伐迹地七千三百一十六顷,除农民其它用地外,更新跟上采伐,已更新面积为五千五百八十左右公顷,其中人工林为四千一百公顷,天然更新为一千七百二十七公顷。
(A) Liu Maohe forest poplar growth characteristics and cultivation Liu Maohe forest farm, is the Changbai Mountain Linjiang Forestry Bureau, one of the key forest farms. Since its establishment in 1960, it has harvested a total of 710,000 cubic meters of timber and 7,131 hectares of harvested land. Apart from other land for peasants, the system has been updated to keep up with logging. The area was upgraded to 5,500 About 80 hectares, of which 4,100 hectares of plantations, natural regeneration of 1,727 hectares.
其他文献
日本黑松(Pinus thunbergii Parl.)原产朝鲜和日本,我国辽东半岛、山东、江苏、浙江和台湾有栽培。垂直分布在海拔600米以下。常绿乔木,为暖温带喜光树种,前期生长较快,后期
本文通过把意向性与虚构名称的内涵相联系,在继承塞尔的意向性理论和簇摹状词理论的基础上,探讨了意向性在解释虚构名称的涵义获得和涵义析取方面所起的不可或缺的作用,从而
李杜将军名荫培,字植初,1880年8月生于今辽宁省义县,1901年投笔从戎,后入东北讲武堂学习,毕业后历任奉军连长、营长、团长、师长等职,九一八事变前任东北军第二十四旅旅长兼
为克服高温环境对于大跨度预应力连续刚构桥主跨合拢施工所造成的不利影响,本文依托赣江特大桥第七联中跨合拢工程,研究探讨了在高温环境下人工降温对于连续刚构桥合拢的影响
Aims: To assess the prevalence and cumulative incidence of open angle glaucoma (OAG) in a cohort group of siblings of OAG probands. Methods: Between 1994 and 20
七十年代以来,我县营造了上万亩的杉檫混交林。为了及时总结营造杉檫混交林的经验与教训,我们赴全县营造杉檫混交林较多的社队林场作了一些调查研究。获得的材料说明,凡是在
前言栎树生长随着(1)每个生长季旺盛生长的次数;(2)旺盛生长之间停滞期的长短;(3)每一旺盛生长期间的生长总量以及(4)枝条和根系生长之间关系等变化而变化。这些变化与生长
Purpose: The purpose of the current study is to evaluate the relation between various specific class E immunoglobulins (IgE) in the serum and allergic conjuncti
Supermacroporous composite cryogels embedded with SiO2 nanoparticles were prepared by radical cryogenic copolymerization of the reactive monomer mixture of acry
小果垂枝柏(Sabina recurva var Coxii)为柏科园柏属植物,又名香柏(云南宁蒗)、香刺柏(云南维西)。分布我省西北部海拔2400~2800米的云杉林、冷杉林,或其他针阔混交林内。常