共查询到20条相似文献，搜索用时 109 毫秒
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基于3ds Max的虚拟校园三维模型的创建 总被引：3，自引：0，他引：3
研究了基于3ds Max软件的虚拟校园三维模型的创建方法,具体讨论了校区三维建模的流程、建筑三维模型的创建、其它地物模型的创建,利用3ds Max软件建模,创建了东北林业大学校园建筑物三维模型。 相似文献
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为了解植物中绿原酸合成代谢途径关键酶的理化性质和进化关系,收集了NCBI数据库中绿原酸代谢途径3个关键酶(Hqt、Hct、C3h)的序列信息,利用在线软件ExPASy-ProtParam分析了它们的理化性质,利用M EG A-7软件比较了它们的序列相似性并建立进化树.理化性质分析结果表明:合成绿原酸的3种关键酶多为亲水... 相似文献
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目前林业调查设计常用的制图软件有auto CAD(Computer Aided Design计算机辅助设计,ArcGIS地理信息系统,Adobe Photoshop图象处理软件,Corel-DRAW软件和3DSMAX电脑三维动画、模型和渲染软件。可行性研究报告需要的图件有:位置示意图、项目区现状图和项目区平面布局图。如果可行性研究报告中涉及房建等工 相似文献
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介绍了当今园林设计的新思维、新方法和园林效果图创作中常用的软件及其使用性能,提出了用微机绘制园林效果图的3个步骤. 相似文献
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基于ArcGIS Engine帽儿山森林多资源管理系统的研建与实现 总被引：1，自引：0，他引：1
以C#语言为开发平台,以ArcGIS Engine为开发组件,以帽儿山实验林场的森林资源调查数据和地理信息数据为基础,进行森林多资源管理系统的设计与实现。该系统实现帽儿山实验林场地区森林多种资源信息的查询、分析与决策,其中包括GIS基本功能、专题图的生成、森林灾害管理和伐区采伐管理等功能,最终完成帽儿山实验林场的一个较为完善、专题性强和可扩充的森林多资源管理系统。该系统的研究与实现对帽儿山林场的经营管理及外业调查工作都有一定的实际意义。 相似文献
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参照国家木材物理力学试验方法标准对采自东北林业大学帽儿山实验林场的15年生人工林长白落叶松不同地理种源的试材,测定了气干密度、年轮宽度、晚材率、硬度、管胞长度、管胞长宽比等参数;并通过综合评估分析处理试验数据。鉴于落叶松主要作工程用材和制浆用材,从木材材性角度评价地理种源的优劣,旨在为速生人工林木的定向培育提供科学依据。 相似文献
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Lastvears.manvrescarchaboutintcr-sPecificrclationshipofmixcdstandsforIarchandasht`crcrePeatcd,mostof\`tich,hot`cvcr,isfortheplantingtypeoflinc-bclt.Thispaperanalysisash-larchrclationshipfor26agcdartificialIarchstandmixedwithcvenagcdashinnaturalreqencration.SlTEANDMEASUREMENTMETHOl)ArtincialIarchstandmcasuredlocatcdatecologicaIcxPCrimcntstationinMaocrshanMountainForcstryFarmofNortbcastForcstryUnivcrsity'(El27'34',N45"24').LarchttasplantcdonagrcatPCaccofdescrtcdfieIdinl967t"itha… 相似文献
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IntroductionEarlyseIectionisanimportantpartforforesttreeim-provement.TreequaIityandproductioncanbeim-provedthroughselection.lnrecentyears,wehavepaidmoreattentiontoearlyselectionandprediction.EarIyselectionisanimportantpartforforesttreeimprove-ment.Thegene… 相似文献
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水曲柳苗木抗寒性培育研究 总被引：3，自引：0，他引：3
1997年5月在东北林业大学帽儿山实验林场开展了有机肥、化控物质处理及密度试验对水曲柳一年生幼苗生长和抗寒性影响的研究。结果表明：以猪粪作底肥，能明显促进苗木的生长，并表现出较强的光合作用和较高的束缚水指标；化控物质中以生物助长剂浸根、ABT浸根和GA 多效丰产灵茎叶喷施对苗木的生长有促进作用，束缚水指标仅次于施肥苗；三种密度的增大，其顶芽、地径随着增大。 相似文献
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The stem analysis ofBetula platyphylla in natural forest at the Maoershan Forest Experimental Station of Northeast Forestry University, showed that the growth variation
of the trees, including height and diameter breast height, decreases with the increase of the age. There is the turning point
for the growth variation of the tree from acute change to relative stability when the trees are in eighteen years old. There
are significant differences among the height, diameter and volume growth of the trees at that time. Therefore, the optimal
age for early selection of this species in natural stands is eighteen years old (18 a). Diameter is used as main index for
selection and height growth as auxiliary one.
(Responsible Editor: Zhu Hong) 相似文献
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WANG Qing-gui XING Ya-juan ZHOU Xiao-feng HAN Shi-jie 《林业研究》2006,17(4):289-292
Introduction Biodiversity is a popular way of describing the diversity of life on earth. It includes all life forms and the ecosystems in which they live (Menini 1998). Biodiversity plays a fundamental role in organic and sustainable food production, and … 相似文献
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Eight provenances of 19-year-oldPicea koraiensis Nakai from the provenance trials of Maoershan (45°20′N, 127°30′E), Liangshui (47°10′N, 128°53′E) and Jiagedaqi (50°24′N,
124°07′E) in Northeast China were investigated to analyze the genetic variation in growth characteristics (tree height and
diameter) and wood characteristics (tracheid length, tracheid diameter, tracheid wall thickness, annual ring width as well
as wood density). Great variation in height growth and breast height diameter growth was observed among the provenances, and
along with the increase of tree age, these provenances presented different geographic adaptability. The growth characteristics
ofPicea koraiensis stand at age of 10 in Maoershan and Liangshui provenance trials had a positive correlation with longitude, and with increase
of tree age to 15 and 19, the tree growth of the provenances displayed a significant positive correlation with latitude as
well as altitude. For wood characteristics, great variation was also found among the provenances. There exists a close relation
between growth characteristics and wood properties of the provenance. The height and breast height diameter growth of the
provenance had a positive correlation with tracheid diameter and annual ring width, and a negative correlation with tracheid
wall thickness and wood density. Genetic performance of the provenance in all above characteristics was also investigated
in order to provide more useful information for comprehensive selection of this species for pulpwood and plywood production.
Foundation item: The paper was supported by National Key Project of The State Forestry Administration. (96-011-01-06)
Biography: WANG Qiu-yu (1957-), female, professor in College of Life Sciences, Northeast Forestry University, Harbin 150040, P. R.
China.
Responsible editor: Song Funan 相似文献