Use of Near Infrared Spectroscopy to Measure Mechanical Properties of Solid Wood     

YU Huaqiang ZHAO Rongjun FU Feng FEI Benhua JIANG Zehui Research Institute of Wood Industry  Chinese Academy of Forestry  Beijing  P.R.China 《中国林业科技(英文版)》2007,6(2):14-19

The visible and near infrared （NIR） （350-2500 nm） spectra and the MOE of 438 small clear wood samples from Chinese fir, eucalyptus and poplar 72 were measured. Using partial least-square （PLS） modeling, the NIR spectra could be used to predict MOE and MOR of the clear-wood samples from Chinese fir and eucalyptus solid wood. NIR spectra could only be used to Predict MOE but not MOR of poplar clear-wood samples. With the exception of MoR of poplar clear-wood samples, the correlations between NIR and the mechanical properties are very strong, and the calibration and test correlation coefficients are both above 0.80.  相似文献   

Analysis of Original Causes of Reed Fires in Zhalong Nature Wetland Reserve in Heilongjiang Province     

WANG Mingyu SHU Lifu TIAN Xiaorui WANG Zhicheng. Research Institute of Forest Ecology  Environment  Protection  Chinese Academy of ForestryThe State Forestry Administration’s Key Open Laboratory of Forest ProtectionBeijing  P. R. China . Institute of Forest Protection of Heilongjiang Province  Harbin  P. R. China 《中国林业科技(英文版)》2006,5(1):57-61

Zhalong Nature Reserve is located in the border areaof Qiqihaer City, Fuyu County, Lindian County andTailai County of Heilongjiang Province. The area ofthe reserve is 210 000 ha. The reserve is the firstnature reserve for protecting wetland and crane inChina. There were more than 300 red-crownedcranes here at the very most. Zhalong Nature Reserveis situated at the Songnen Plain, the lower stream ofthe Wuyuer River. It is the biggest nature reserve inChina that takes crane and wetland …  相似文献   

生根量和育苗容器形状对白云杉苗早期生长的影响     

LesterW.Calson  FrankEndena  戴春燕  宋增 《河北林业科技》1988,(4)

<正> 一、引言 关于生根量对于针叶树容器苗早期生长的影响问题,安迪(Endean)和卡尔松(Carlson)先生早在1975年曾经论述过。在容器苗生产的培育阶段,生根量很少严重地阻碍到针叶树苗的生长。但随着育苗容器容积的增大,象美国黑松(Pinus Contorta Dougl)、白云杉(Picea glauca Voss)、加拿大短叶松(Pinus banksiana Lamb.)等苗木的干  相似文献   

对腰果叶面喷施尿素的叶龄、浓度和吸收时间的研究     

S.ANKAIAH  P.V.RAO  罗仲全 《热带农业科技》1986,(3)

<正> 腰果的叶面施肥效果,包括叶龄、施用浓度和施用时间等因素,对此进行研究:当新叶刚萌发时,选择生势和树冠均一致的8株树,在萌发后一周对2株树进行处理;叶龄2周时,对选出的另2株树进行了相同的处理。随后在叶龄3周和4周时分别进行相同的处理。取叶片样品分析,发现叶龄和尿素浓度的差异极显著,吸收时间则不重要。根据这项研究,可以认为,在腰果叶龄为3周时喷施4％的尿素有好的效果。  相似文献   

用树高与胸径估测生境质量     

B.B.Stout  齐之尧 《内蒙古林业科技》1985,(1)

为了精细管理森林资源,需要简便易行、准确可靠的估测生境质量的方法,本研究的目的是根据树高(H)与相应的胸高直径(D)检验估测生境质量的方法.森林生产力是单位时间(年)的材积生产量.是预报资源管理所必须的数据,森林生产力的估测取决于生境类型和时间.与时间无关的生境质量可不考虑林龄进行无偏估计.以往用的生境指数法,把年龄对应的树高值作为生境指数(SI).  相似文献   

处理多波段数据课题中的主元素方法     

В.А.Красиков  М.В.Хатунцева  Ю  М.Штарьков  赵显文 《林业资源管理》1984,(3)

<正> 1.减少测度的维数假设u~(i)=(u_(1i),u_(2i),…u_(ni))—为影像第i个因子的多波段测量值(在n个光谱段中的光谱亮度值),而n={u~((1)),u((2)),…u~((n))}—是对整个影像或它的局部量测值的总和。处理这些数据对下列各点是重要的。  相似文献   

辐射松的隐座霉疫病     

I.A.S.Gibson  陈小华 《热带林业》1983,(1)

世界上人口不断增长,对植物资源,包括木材的需要不断增加,在满足人类木材要求方面,辐射松(Pinus radiata D.Don)起着重要的作用。辐射松每年每公顷生长量可高达24立方米,而且造林容易,成本低廉,是一个优良的造林树种。辐射松在原产地仅分布于加利福利亚滨海以及瓜德罗普沿岸岛屿大约4000余公顷的地区,而且形状和大小也并不出众。但在十九世纪后期引种到许多其它国家后,其生长一般比原产地好,智利、新西兰、澳大利亚和东非等国家和地区都采用它作为营造大面积商品林的树种。迄今为止,辐射松栽植最广的地区是智利和新西兰,这两个国家都有25万公顷以上的辐射松林,生产木材和发展造纸业。澳大利亚也有10万公顷以上的辐射松林,大部分  相似文献   

Analysis of Sediment Source of Watershed in Western Shanxi of the Loess Plateau     

LIU Huifang* WEI Tianxing ZHU QingkeSoil  Water Conservation  Combat Desertification Laboratory  Beijing Forestry University Beijing  P.R.China 《中国林业科技(英文版)》2004,3(2):71-76

1 INTRODUCTIONThe Loess Plateau is the most drastic soil erosion regionin China, with the most severe water erosion. Thedistribution of types and intensity of erosion not onlyhave regional diversity but also have perpendicularvariation. In the small watershed, there are differencesin erosion characters among its upper, middle and lowerreaches. It is very significant for taking rationalmeasures of soil and water conservation and forpreventing soil and water loss to analyze the relationbe…  相似文献   

Research and Conservation of Forest Genetic Resources in China     

GU WanchunResearch Institute of Forestry. Chinese Academy of Forestry. Beijing  China 《中国林业科技(英文版)》2002,(1)

The present situation of forest tree genetic germplasm resources research and conservation in China is introduced which including the background, decision-making of conservation strategies and principles, the plan of area division and tree species classification, the sample strategy of germplasm conservation, the advances in conservation pattern and related technologies research, the achievements of germplasm conservation and utilization in China, and the problems to be solved. The recent achievements and data related are listed.  相似文献   

Monitor Forest Fires with FY Serial Satellites     

YAO Shuren WANG Mingyu SHU Lifu TIAN Xiaorui LI JieInstitute of Forest Protection. Chinese Academy of Forestryfire @forestry  ac. cn Forest fire manaeement office. State Forestry Administration 《中国林业科技(英文版)》2003,(3)

Remote sensing as the measure to monitor disasters has the advantage of temporal resolution and large scale. Since "5.6 catastrophe" in 1987, China began to monitor forest fires broadly. In the summer of 2002, many forest/grass fires occurred in the Daxing'anling Mountains, and the damage was very heavy. In the forest fires fighting, the meteorological satellites play an important role in monitoring the fires. Especially the FY serial meteorological satellites have the advantage of large scale monitoring and characteristics of being in time and exact, and get good results. Remote sensing techniques have been used in many aspects of forest/grass fires research, including burned area and fireline intensity evaluation, post fire environment monitoring etc.  相似文献