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落叶松云冷杉林
相关语句
  larch and spruce-fir
     Based on a systematic summing-up of stand growth modeling and on an analysis of present research situation of ecological cutting/regeneration, the paper carried through analysis and modeling of growth dynamic of studied objects, and investigated the impact of logging activity on the objects and environment, thus proposing a technical system for logging regeneration in larch and spruce-fir forest environment on Changbai Mountains, including both common technical principles and individual technical indexes.
     本研究在系统总结分析林分生长模拟和生态采伐更新研究现状的基础上,以长白山落叶松云冷杉林为研究对象,进行研究对象的生长动态分析和模拟,研究采伐活动对研究对象及其环境的影响,总结提出长白山落叶松云冷杉林生态采伐更新技术体系,包括共性技术原则和个性技术指标。
短句来源
  “落叶松云冷杉林”译为未确定词的双语例句
     Study on the Growth Modeling and Technical System of Ecology-based Harvesting and Regeneration for Larch and Spruce-Fir Stands
     落叶松云冷杉林生长模拟及生态采伐更新技术体系研究
短句来源
  相似匹配句对
     ^PICEA-ABIES FORESTS OF THE NORTHEAST CHINA
     中国东北的杉林
短句来源
     Study on the Growth Modeling and Technical System of Ecology-based Harvesting and Regeneration for Larch and Spruce-Fir Stands
     落叶松杉林生长模拟及生态采伐更新技术体系研究
短句来源
     Study on carbon storage of Korean pine- spruce-fir forest in Changbai mountains
     长白山红松杉林碳库研究
短句来源
     THE CLOUD
    
短句来源
     Clouds
    
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The mean crown-width of stand-grown trees was modeled as a function of stem diameter at breast height, tree height, crown length, crown ratio, competition index and stand density for several tree species in 20 mixed stands of Larix olgensis, Abies nephrolepis and Picea jazoensis in northeastern China. Multivariate stepwise regression was performed with the data of 3 099 crown-width observations for nine tree species including L. olgensis, P. jazoensis, A. nephrolepis, Pinus koraiensis, Betula costata, B. platyphylla,...

The mean crown-width of stand-grown trees was modeled as a function of stem diameter at breast height, tree height, crown length, crown ratio, competition index and stand density for several tree species in 20 mixed stands of Larix olgensis, Abies nephrolepis and Picea jazoensis in northeastern China. Multivariate stepwise regression was performed with the data of 3 099 crown-width observations for nine tree species including L. olgensis, P. jazoensis, A. nephrolepis, Pinus koraiensis, Betula costata, B. platyphylla, Acer mono, Tilla amurensis and Fraxinus mandshurica. Results showed that tree diameter at breast height and stand density were significant variables in crown_width prediction models for all tree species. The adjusted R2 value was between 0.34 and 0.75. Absolute and relative bias values were between -0.000 114 and 0.054 m, -0.054 43% and 3.440%, respectively. RMSE and relative RMSE values were from 0.360 to 0.510 m, and 27.4% to 37.4%, respectively.

以20块落叶松云冷杉林为对象,采用多元逐步回归方法,研究其组成树种的单株木冠幅预测模型.因变量为单株木冠幅,自变量包括胸径、树高、枝下高、树冠比、竞争因子和林分密度.共测定了3099株树木,全部参加了建模.最终建立了长白落叶松、冷杉、红松、云杉、枫桦、水曲柳、色木、白桦和椴树9个树种的冠幅预测模型.结果表明胸径和林分密度是所有树种中影响冠幅的重要因子;模型的调整决定系数在0.34~0.75之间;绝对误差在-0.000114~0.054m之间;相对误差在-0.05443%~3.440%之间;均方根误差在0.360~0.510m之间,相对均方根误差在27.4%~37.4%之间.

 
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