搜索结果: 1-11 共查到“知识库 林业系统工程”相关记录11条 . 查询时间(4.233 秒)
Determination of forest skid trail density in Caspian forests, Iran
timber harvesting winching time study
2016/3/2
Calculation of Skid Trail Spacing (STS) is an important option to minimize the total costs of skidding. Construction of many skid trails increases the construction cost, it also results in more degrad...
Time study and skidding capacity of the wheeled skidder Timberjack 450C in Caspian forests
wheeled skidder Timberjack 450C working efficiency init cost skidding
2015/3/12
This study was carried out in a steep and difficult terrain. Trees were logged downhill to the landing by a wheeled skidder Timberjack 450C. Selection cutting was performed on a 66-hectare tract with ...
economic effectiveness of sustainable forest management
economic effectiveness sustainable forestry management management intensity
2015/3/3
The article deals with economic aspects of sustainable forest management. The analysis stems from
Plíva’s typological system. Several hundreds of variants were calculated for forest silviculture pro...
Thinning experiments in Norway spruce stands after 40 years of investigation – 1st series
negative selection from below thinning Norway spruce
2015/1/29
Forestry and Game Management Research Institute at Jíloviště-Strnady has created a new experimental base for thinning research since 1956. A total of 46 experimental series were founded in Norway...
Effects of Forest Clearcut and Afforestation on Streamwater Chemistry in Japanese Cedar (Cryptomeria japonica) Forests:Comparison among Watersheds of Various Stand Ages
afforestation Cryptomeria japonica forested watershed stand age streamwater chemistry
2009/8/21
We analyzed the streamwater from 33 forested watersheds in Nara Prefecture, Japan, in 2002 to clarify the influences of forest clearcut and subsequent afforestation on streamwater chemistry. Each wate...
森林工程的可持续发展探讨
可持续发展 森林文化 生态森林 战略
2009/12/16
通过系统地分析森林可持续发展提出的背景，对可持续发展的含义进行了深刻的挖掘，突出强调了森林可持续发展的重要意义。在准确定义森林工程可持续发展概念的基础上，分别从社会、生态2个方面来分析可持续发展的研究方向，并提出了一些相应的发展措施，从而总结归纳出森林工程可持续发展的战略和方针，以期为今后我国森林工程的全面可持续发展提供一定的参考依据。
Moving along the community–researcher continuum towards participatory research in British Columbia
social science research British Columbia community-based participatory research Arnstein’s
2009/2/11
With initiatives such as forest certification, innovative forest practices agreements, model forests, and
community forest pilots, gathering data on social and economic factors relating to natural re...
Natural composition of tree species as a basis for model development of stumpage price
plantassociations stumpageprice forest management model
2009/2/7
Model development and use play a significant role in research and forest management of Slovenian forests. As co-natural and sustainable forest management is traditional, it is essential to rely on a...
森林气候实时建模方法的研究
动态纹理
2008/7/8
提出了一种半透明体建模方法：对采集的图像学习生成过程纹理，对纹理进行边界合成得到划分了颜色区域的图像，对颜色区域边界进行扫描，勾勒出图像的轮廓线网格，并根据当前颜色为每个网格边界赋颜色值，根据网格的颜色值生成三维模型。实验证明这种动态景物的建模方法能够满足虚拟场景实时绘制的要求，而且具有很好的鲁棒性和连续性。
《北方国家级林木种苗示范基地建设工程初步设计》
北方国家级林木种苗示范基地 建设工程 初步设计
2008/6/10
北方国家级林木种苗示范基地是1999年10月首批获得国家计划委员会批准立项的国家级大型项目。基地总面积2348亩，设计年产量1613万株。由我院（国家林业局调查规划设计院）负责初步设计和施工图设计总承包，以及主要设施设备的招标、评标。
整个工程的设计手段先进、科技含量高，得到国家计委、国家林业局等有关领导和专家的充分肯定和认可。现已成为目前我国种苗基地建设的典型范例，对全...