共查询到19条相似文献,搜索用时 265 毫秒
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辽宁人工红松林主要病害调查研究 总被引:2,自引:0,他引:2
红松材质优良,生长迅速,为珍贵造林树种之一。半个世纪以来,特别是1949年以后的三十多年间,东北地区人工栽植了许多红松。但出于树种单一,造林及经营措施不宜等弊病,随着大面积人工红松林相继成林,病虫害种类逐渐增多,危害亦日益加重。草河口林区是我国研究人工红松林的重要基地之一,境内生长有国内林龄最大的人工红松林。几年来,我们以草河口林区为中心,对辽宁东部山区的人工红松林病害做了一些调查和采集工作。为了系统地了解辽宁人工红松林病害种类、分布及危害情况,调查也 相似文献
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天然红松林对病虫害的自然控制机制 总被引:1,自引:0,他引:1
利用各种生物因子制约林木害虫种群数量的增长和病害的流行,使病虫害在一定的幅度内维持动态平衡,进而实现病虫害的自然控制,这是一种比较理想的状态。为科学、有效的借鉴天然红松人工林对红松林病虫害进行自然控制的模式,分别在黑龙江省鹤北林业局天然红松母树林和丰林国家级自然保护区红松林内,对天然红松林植物结构及病虫害的自然控制机理和作用进行了相关的调查和研究。 相似文献
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关于红松林树干分杈的调查研究 总被引:2,自引:0,他引:2
红松林树干分杈不仅在天然林中非常普遍,而且在人工林中,亦日益严重。近年来,由于小兴安岭等地,成片红松林分杈严重,干形弯曲,失去其经营价值,损失严重,因而引起重视。为了弄清红松林木的分杈规律及分杈原因,作者在小兴安岭、张广才岭等地区,对天然和人工红松林进行了反复调查。现将调查情况介绍如下。一、环境条件对红松树干分杈的影响 (一) 坡向与红松树干分杈的关系 1.红松天然林 相似文献
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论述了黑龙江省红松林主要害虫的种类、分类地位、危害部位以及危害程度,共包括5个目14科36种。其中,枝梢及球果害虫松梢象、冷杉梢斑螟、微红梢斑螟以及食叶害虫落叶松毛虫是黑龙江省红松林的最主要害虫。同时,还提出了黑龙江省红松林主要害虫的综合防治技术措施。 相似文献
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天然红松林生物多样性与燃烧性的研究刘艳红,张维,许翠青(东北林业大学)宋玉福,马广辉(黑龙江省第三林业调查规划设计院)(牡丹江市林业局)阔叶红松林是小兴安岭的地带性顶极植被,对我国国民经济和生态环境作用重大。本文从天然红松林物种多样性、环境多样性与森... 相似文献
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对小兴安岭东折棱河林场2种不同类型的红松林——椴树红松林和云冷杉红松林进行调查,应用重要值、辛普森多样性指数(Simpson’s diversity index)和香农-威纳指数(Shannon-Weiner index)对2种不同红松林乔灌草三层的生物多样性进行了分析和比较。结果认为,云冷杉红松林总体物种丰富度、信息量、生物多样性指数均高于椴树红松林。 相似文献
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通过研究100株原始红松林内树高小于14m的红松解析木,分析了林下红松生长类型,林下红松生长与上层结构因子的关系,林下红松的形态特征及生理特性,结果表明,林下红松生长可划分为恒定型、下降型和上升型。被自然淘汰的林下红松皆属于恒定型和下降型。林下红松的生长受上层林冠结构因子的制约,没有合适的结构条件,林下红松很难存活。研究得出了天然林冠下红松被压木能够上升到上层林冠所需胸径、树高、树冠面积、边材宽、冠长/树高等形态学指标的最低极限值。 相似文献
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在黑河市平山林场选取环境条件(如坡度、坡向、郁闭度等)相似的阔叶混交林、落叶松阔叶林、红松阔叶林3种森林群落类型样地灌木进行分析的结果表明,红松阔叶林的Gleason指数、Shannon-Wiener指数、Simpson指数都较大,其物种丰富度和多样性均较高;毛榛子为各林分类型下灌木层的主要物种。 相似文献
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Liu HuirongNortheast Forestry University 《林业研究》1993,4(2):11-17
The plantations of korean pine(Pinus koraensis)and scots pine(Pinus sylvesrisvar.mongolica)are mainly pure stands.Fires are gradually causing problems in theseplantations and being paid much more attention recently.Study on the influence of fire ontrees and the adaptation to fire,therefore,is of great important to probe the fire ecologicalproperties and the protection ways of these two species.The results are as follows:Bothof the species are easily damaged by fire,but korean pine is more susceptible.In the samefire,korean pine is damaged more seriously than scots pine although they have the samesize.Young individuals have low fire resistant capacity and can be damaged seriously,andolder ones have strong fire resistance and can be damaged lightly.Up-hill fire makes aserious damage to the trees distributed in up-slopes with the reason of higher fireintensity.Down-hill fire makes a serious damage to the trees distributed in down-slopcswith the reason of higher fire severity.The larger deocambium area in t 相似文献
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林业在海南建设生态省中的地位与作用 总被引:2,自引:0,他引:2
综述海南热带森林是保存生物物种多样性的基因库,也是保护生态环境的重要屏障,林业既是一项经济产业又是一项社会公益事业,它对保护人类的生存环境发挥着不可估量的社会效益、生态效益和经济效益,发展林业是海南建设生态省的关键基础工程。 相似文献
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生命表法分析小兴安岭天然杨桦林恢复成阔叶红松林的可能性 总被引:1,自引:0,他引:1
文章阐述了生命表法的基本理论,提出在静态生命表中用树高代替年龄的作法,并用其对小兴安岭缓坡天然杨桦林恢复成阔叶红林的可能性进行了探讨。认为,如果没有特殊情况发生,天然杨桦林下红松大5m后基本能存活下来与顶极阔叶种相伴进入主林层。 相似文献
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Yang Guoting Chen XiangweiNortheast Forestry UniversityZhou DanBotanical Garden of Heilongjiang Province 《林业研究》1992,3(1):42-47
In this paper,the quantitative approach is applied on the study of coniferous forestbased on the data which were collected by the field investigation in Daxinganling region.The mainpurpose is objectively to show the position of communities in the space and the relationship be-tween the community and environment.By means of ordination,it is found that dahurian larch for-est,mongolian scots pine forest and korean fir forest lie in different positions. Gradient analysis ofthree dominant types of conigerous forest has revealed the difference of ecological amplitude,thedifference is one of the important reasons that determine the different communities in the differentenvironment. 相似文献
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对低密度的杨桦林经营过程中需要解决的主要技术问题进行了研究,包括上层林及林冠下栽植密度的确定,最小栽植空间的确认以及红松最适宜的透光时间和透光方法。 相似文献
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Investigations were made in korean pine, mongolian scots pine and dahurian larch plantations in Laoshan Plantation Experiment
Station of Maoershan Experiment Forest Farm of Northeast Forestry University. Data are tabulated on the amount and seasonal
and annual fluctuations of fractional composition of the litter (conifer needles, branches, cones, bark scales, broad leaves)
in the three plantations. The accounts of conifer needle branch and bark scale litter are as follows: korean pine: 71.16%,
6.23% and 7.32%; mongolian scots pine: 43.65%, 18.52 % and 32.12%; dahurian larch: 90.30%, 7.83% and 1.85%. There are certain
broadleaf litter in dahurian larch and mongolian scots pine plantations (account for 7.61% and 8.92% respectively). The litter
wither and fall concent ratively in autumn in dahurian larch plantation and scattered all year long in korean pine and mongolian
scots pine plantations. Along with the increase of stand age, the absolute amount of litter tend to increase, the relative
amount of main fractional compositions (conifer needle, branch and bark scale) in korean pine and mongolian Scots pine plantations
maintain stead, whereas in dahurian larch plantation, the relative amount of conifer needle is decreased gradually and the
relative amount of other fractional compositions are increased gradually. 相似文献