林种结构
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大兴安岭林区土地资源优化与林种结构调整
Land Resources Optimum and Forest-type Structure Regulation for Daxing ' anling Forest Region
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吉林省西部地区林种结构的多目标规划
Multi-target programming for constituents of forest species in the west of Jilin Province
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武义县林种结构调整研究
Study on Tree Species Structure Regulation in Wuyi
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线性目标规划及其辅助模型在县级区域性林种结构调整中的应用
Application of Linear Goal Programming and Supplementary Model on Regional Structure Adjustment of Forest-type
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应用多因子综合评审法确定林种结构
Defining Forest Category through Multi-factor Comprehensive Appraisal
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黑龙江省合理森林覆被率与林种结构的研究
Study on the Reasonable Percentage of Forest Cover and Structure of Forest Types for Heilongjiang Province
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结果表明该模型对解决林种结构的合理规划是实用可行的。
It shows that the model is applicable and effective for planning the forest category structure .
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我国正在实施林业分类经营,其主要内容之一是森林资源林种结构调整。
Forestry classification management is implementing in China now . Category of forest structure adjustment is a main task .
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晋西山区防护林体系林种结构优化方案的研究
A study on the plan of superiority of woods combination of shel-ter forest system in the western mountain area of Shanxi Province
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最后经过调整林种结构和林龄结构,以达到提高森林可持续经营能力的目的。
With the regulation of the structure of forest species and age , the of capacity raising of forest sustainable management will gotten at last .
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在准则层中,功能稳定性较强而结构合理性较脆弱;在约束层中,林分结构和生态防护功能稳定,经济效益较稳定,林种结构和树种结构脆弱,社会效益极脆弱;
In limiting layer , ecological protection function and tree species structure have high contribution to the stability of protection forest system in oasis irrigation area ;
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通过2849株冷杉伐倒木测定表明,冷杉林木发生腐朽后,林种结构有明显的变化,优良林种下降,加工材增加。
The determinations of 2 , 849 felled trees of fir have shown that . after fir trees had decayed , excellent timber decreased while the processing timber increased .
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本文运用数学分析的方法,对晋西山区的林种结构进行了优化选择、结果表明;
By using the mathematic analysis method , this paper , gives an overview about the plan of superiority of woods combination in the western mountain area of Shanxi province .
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然而,库区目前的森林资源分布不均匀、林种结构不合理、林分结构简单,难以充分发挥其生态防护功能。
However , the forest resources in the Three Gorges Reservoir have weak ecological protective function because of uneven distribution , unreasonable proportion and simple stand structure and so on .
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平和天马国有林场从场情出发,调整林种结构、产业结构,发展多种成份经济,增强了林场综合实力。
The forest category structure and industry structure are adjusted as well as multiple component economy is developed by Tianma National Forest Farm , Pinghe , the forest farm comprehensive strength is enhanced .
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指出广西铁路沿线防护林存在林种结构单一、种植不规范、断带现象严重、造林水平低、防护林总量少等问题。
During survey of the existing forest , several problems were found such as single forest structure , non-standard planting , discontinuous forest belts , low forestation level , less shelter forests , etc.
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研究区域41年间有林地、灌木林地面积增加,森林覆盖率和土地利用率都有所增长,人工林面积有较多增加,林种结构有所改善。
During forty-one years , the area of forest land and shrub land increase , forest - covered ratio and used-land ratio rise , artificial forest area increases much more and forest structure also improves .
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人工针阔混交林的培育,不但能提高森林的覆被率,保护森林的生态系统,调节森林的林种结构,而且能提高森林的生态效益、经济效益、社会效益。
Cultivating plantation mixed by coniferous and broadleaf could increase coverage of forest , protect ecosystem , and adjust structure of forest category , so forest benefits in the ecological , economic and social would be improved .
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森林生态安全问题主要表现森林组成结构不合理、质量不高和生态服务功能较低等,调整林种结构、加大林业科技投入和建设生态林业等措施可逐步实现森林生态安全;
The main problem of forest eco-safety is that the forest structure is unreasonable and the forest quality and the function of eco-service are lower . The measure of realizing forest eco-safety is adjusting forest structure , increasing technological and scientific input and building eco-forest .
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建议,海南省应减少用材林面积的比例,增加防护林面积的比例,围绕生态省的建设,狠抓林种结构调整,使不同林种比例结构适合生态省建设的需要。
The paper suggests that the area proportion of timber forest should be reduced , and the one of protection forest area should be increased . Simultaneity , the structure of forests should be adjusted attentively according to the needs of ecological construction in Hainan Province .
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根据1993年省森林资源清查、森林资源消耗量及消耗结构的调查资料,以可持续发展的理论为指导,采用线性规划对我省的林种结构进行了研究。
Based on many data , such as Henan forest resources inventory in 1993 , Henan forest resources consume volume and structure , etc. Directed by the theory of sustainable development . Using AFS algebra and AFS structure , any human ordinary fuzzy concept can be represented .
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用Hopfield网络模型解决林种树种结构优化问题
Building the Optimal Model of Tree Species Structure by Hopfield Network
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鳞毛蕨(Dryopterisfilix-mas)天山云杉林种群结构分析
Analysis on the Population Structure of Picea schrenkiana Fisch . et Mey . - Dryopteris filix-mas Stand
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地区林种树种结构优化模型
An Optimum Structural Model of Crop and Tree Species in Jingzhou Prefecture
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层次分析法在林种树种结构优化中的应用研究
Structure optimization of forest catalogue and tree species using analytic hierarchy process
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钝叶黄檀异地保存林种群结构特征研究
Study on Community Structure Characteristics in Dalbergia obtusifolia Prain Ex Situ Conservation Forest
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用层次分析法调整三都县林种树种结构
To adjust the structure of tree species and kinds of forest by AHP in Sandu county
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长白山针阔混交林种群结构及环境解释
Population Structure of Tree Species and Environmental Interpretation in Coniferous and Broadleaved Mixed Forest in Changbai Mountain
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AHP法在区域林种、树种结构调整中的应用研究
Application of AHP method on regulating structure of category and tree species in southern Qinling Mountains
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浙江省林种、树种结构调整研究
Study on Tree Species and Forest Structure Adjustment in Zhejiang Province