内蒙古乌兰察布盟华北落叶松人工林定向培育与经营建议

通过对华北落叶松人工林不同生长发育阶段的研究,提出了适宜华北落叶松生长的立地条件、造林密度、合理经营密度,确定优势木檩材的预估年龄为32～34a。     

落叶松人工林分类及定向培育经营模式

黑龙江省落叶松主要造林树种有长白落叶松(Larixolgansis)及兴安落叶松(L.dahurica)两种.本文讨论的落叶松人工林林分类型及其经营模式泛指在我省小兴安岭、张广才岭、老爷岭及完达山林区分     

日本落叶松人工林经营利用与经济效益分析

以营造的29龄日本落叶松人工林的4次抚育间伐利用和获得的木材经济效益为依据，计算得出，在小陇山林区的立地和气候条件下营造日本落叶松人工林效益巨大，29龄林分4次抚育间伐及保留林木的木材效益达到89500．30元／hm^2，利润52301．78元／hm^2。以造林投入为基数，依产值计算，投入产出比为1：73．32；依利润计算，投入产出比为1：38．84；每公顷林木的木材年纯收益达到1803．51元。     

人工林定向培育密度控制的研究

人工林定向培育密度控制的研究吴济生，刘恩海（黑龙江省林业科学研究所）张万荣，张增福，王双东，杨静（尚志市一面坡林场）人工林的定向培育在立地选择和种源选择之后，对生产力影响最大的因子就是密度。林业工作者通过密度调节，控制林分小环境，促进树木生长发育。工...     

华北落叶松人工林经营措施研究

为了提高该林区各国营林场经营落叶松林的水平，促使其早成材、成好材，对落叶松中幼林进行了为期5年的综合试验研究，结果表明：落叶松生长到10－15年时的最佳经营密度应在1800－1950株／hm^2之间，适当施肥可以提高落叶松幼林胸径和树高的生长量。     

华北落叶松人工林可持续经营利用

当前,随着我国经济的快速持续发展,对木材的需求日益加大,木材供需矛盾进一步加剧,尤其是大径级材等特种林木产品成为市场急需的短缺产品。今后我国在解决未来木材供应问题上,应立足于国内生产为主的供应路线,通过充分开发我国广阔的山地资源,采取集约经营、定向培育、规模化生产,加速培育速生丰产用材林、大径级用材林等具体措施,就能够满足国内市场经济需求。     

论人工林采伐更新与定向培育

本综述了国内外大量的研究资料，提出因地制宜的人工林采伐更新与定向培育的方法和技术。     

落叶松人工林天然更新技术探讨

本文就落叶松人工林结实规律、林分状况、生境条件、人为活动对天然更新的影响,分析和探讨了落叶松人工林天然更新规律。提出在适宜条件下采取人工促进天然更新的方式,配合人工更新的措施,不仅加快采伐迹地更新进程而且节省40％～50％的更新费,且幼林生长状况优于单纯的人工更新。     

我国云南红豆杉药用原料林培育技术开发进展

培育红豆杉人工药用原料林既是紫杉醇产业可持续发展的主要途径,也是保护野生资源的有效手段。云南红豆杉紫杉醇含量高,具有较高的药用开发价值。本文系统地阐述了云南红豆杉的资源状况,分析评价了我国云南红豆杉药用原料林培育在良种选育、采穗圃营建、种苗培育、人工林营建与原料采收等关键技术环节所取得的研究进展情况,并针对存在的主要问题,提出了对策建议。     

Pt菌根剂造林应用技术

本文对Ｐｔ菌根剂的作用原理以及在造林实践中的应用技术、应用效果进行了介绍,尤其在落叶松、樟子松两个树种造林上效果明显。     

龙山县八面山华榛人工林造林成效分析

于2004年在龙山县八面山海拔1 200 m地段用1年生华榛实生苗造林,2013年调查造林成效。结果表明:11年生华榛人工林植株保存率84.4%;平均树高6.68 m,树高生长量0.61 m/年,变异系数11.8%~20.6%;平均胸径7.18 cm,胸径生长量0.65 cm/年,变异系数11.4%~32.1%;冠幅面积8.16 m2/株,变异系数68.1%;11年进入初果期,结实率8.1%。分析认为,华榛造林易成林,适宜八面山规模化栽培。光照是影响华榛生长发育的主要因子。     

STUDY ON RETAINING FUNCTION OF LARCH PLANTATION

INTRoDUCTIONInterceptingandstoringrainwaterisamajorfunctionofforestwhichnotonlyde-creasestheintensityofprecipitation,theimpulsiveforceonthestandland,themnoffonthesoilsurface,butalsopro-longsthetimeofrunoffdecreasesthefloodpeak,andregulatesthelevelofrivers.DahurianlarchwithfastgrowthandextensiveadaptabilityisamajorspeciesofshelterbeltinNortheast,NorthandNorthwestareasofChina.Studiesonfunc-tionoflarchstandininterceptingandstor-ingrainwaterisveryimportanttoprotectheadwaterofriversandtoconse…     

First decadal response to treatment in a disturbance-based silviculture experiment in Maine

Disturbance-based silvicultural systems generally seek to promote complex stand structures that are consistent with temporal and spatial patterns of natural disturbance while allowing for the sustainable harvest of timber. Gap-based harvesting systems are commonly used within this framework because they can be designed to approximate the frequencies and spatial patterns of a wide array of disturbance regimes. Patterns in stand-level growth, sapling recruitment and regeneration response were examined for one such gap-based system, the Acadian Forest Ecosystem Research Program (AFERP) in central Maine, that was designed to emulate the annual 1% disturbance frequency typical of the northeastern United States and Canada. A decade after treatment, stand-level differences in basal area growth and density between two gap-based treatments and an unharvested control were not statistically significant, largely due to low replication, but within-stand growth and regeneration responses differed strongly by spatial position relative to harvest gaps. Regeneration of shade-tolerant and intolerant species increased regardless of gap size, likely a response to increasing light availability from canopy openings due to harvesting and mortality. Further, there was evidence of gap size effects on sapling recruitment as large gaps (>1000 m²) favored the growth and survival of mid-successional species such as red maple and white pine, while small gaps (<1000 m²) favored late-succession species such as eastern hemlock and spruce. Overstory growth rates also differed by both species and position relative to harvest gaps with most species growing best in gaps and better along gap edges than in adjacent forest. Notably, overstory growth rates for white pine were not influenced by spatial position. These results suggest harvest gaps may have significant growth and regeneration impacts in adjacent, yet unharvested areas, which could lead to profound differences in forest development over the rotation. Obviously, longer-term studies of gap-based systems are needed to more clearly elucidate these responses.     

落叶松人工纯林接续林培育技术的浅析

阐述了落叶松人工纯林的缺陷，提出了其培训目标和培育的技术，调整林分树种组成与优化林分结构，最终获得最大的生态效益，社会效益和经济效益。     

大青杨人工林间伐试验

本文通过大青杨在大川林场的密度间伐试验,得出了大青杨树高和单位面积材积的定期生长量与间伐强度的关系,初步确定了培养杨树短周期工业用材林较是伐密度,为我省东部营短轮伐期工业用材林提供了一定的理论依据和实践指导。     

MODELS FOR CROWN STRUCTURE OF LARCH PLANTATION

INTRODUCTIONToreflecttree'sgrowthactivityandcompetitioneffectsoftree'sdevelopment,someofcrownvariablescanbeusedtode-velopcompetitionindexes(Mitchelll975,BigingandWensell99O,BigingandDobbertin,l992).Thecrownsizedirectlyinfluencestree'sassimilationanditisoneofthebasicvariableforpredictingincrementoftree.TherefOre,inmanygrowthandyieldmod-els,treecrowndimensionsareoftenusedasanimportantcomponent.Crownvariablesintroducedingrowthmodelsasameanstoimprovethepredictiveabilityandaccuracyoftreeors…     

黑龙江东部地区落叶松人工林削度方程研究

文章以佳木斯孟家岗林场的不同年龄、不同密度及不同立地条件的落叶松人工林为研究对象，选取130株样木，测定每株样木15个相对高处的带皮直径，采用非线性回归模型的参数估计方法拟合5个削度方程，根据所计算各削度方程的拟合统计量和残差分析，选择最佳削度方程。研究结果表明，模型V-修正Kozak（1994）式为拟合效果最好的落叶松人工林可变参数削度方程。该模型拟合精度高，而且预测误差低、预估精度高，可以很好地估计落叶松不同林木大小任意部位的去皮直径或任意小头直径时的材长，为编制落叶松人工林材种出材率表提供基础。