1) form-factor model
胸高形数模型
1.
Based on the data of 719 sample plots of Eucalyptus plantations in Guangxi,a form-factor model for Eucalyptus plantations is established.
以广西速生丰产桉树人工林719块样地数据为基础,通过优选模型结构,以模型本身为权函数进行加权最小二乘法求解模型参数,研究建立了速生丰产桉树人工林二元胸高形数模型。
2) breast diameter height form factor
胸高形数
1.
The correlation between the breast diameter height form factor η and the diameter height ratio δ with respect to the change in tree age t has been analyzed based on the data obtained from China fir forests.
基于杉木林分调查数据讨论了林分胸高形数η和径高比δ随林龄 t变化的相关性 。
3) geoid digital terrestrial model
高程异常数字地形模型
4) height-diameter model
树高-胸径回归模型
1.
The existing problems of one-way tree volume tables used in continuous forest inventory in Beijing were analyzed,and an approach for formulization of one-way tree volume tables was presented based on the tree height-diameter model.
针对目前北京市森林资源连续清查所采用的一元立木材积表没有数式、应用不便的问题,提出了根据胸径、材积成对值及相应的二元材积式,建立内含树高-胸径回归模型的一元立木材积式的方法,并建立了北京市7个树种组的一元立木材积式,为森林资源连续清查的材积估计提供了方便。
5) growth model of section area of breast height
胸高断面积生长模型
1.
The data used to develop the growth model of section area of breast height of individual tree for secondary forests were collected from 20 Tilia amurensis trees permanent sample plots which were set in the secondary forest region of Mao\'ershan Mountain area in Heilongjiang province,Northeast China.
应用帽儿山天然次生林区不同林分条件下选设的20块椴树(Tilia amurensis)固定样地的解析木调查资料,分析多个单木竞争指标与对象木胸高断面积定期生长量的相关关系,在椴树单木胸高断面积生长模型中引入林木自身大小、单木竞争指标和立地因子,应用回归分析法建立帽儿山地区天然次生椴树单木胸高断面积生长模型。
6) parametrically deformable model
参数变形模型
补充资料：穴形纹胸鮡
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| 俗名: | 老虎鱼 |
| 产地及产期: 分布于伊洛瓦底江及怒江水系。 | |
| 介绍: 口腔顶部有宽平的前颌齿带。胸部吸着器呈桃形。体表光滑。背鳍刺强硬，其后缘光滑无锯齿；胸鳍刺后缘具锯齿；背鳍基骨呈三角形。 底层鱼类，生活于砾石底质的流水环境中，肉食性；是迄今所知个体最大的纹胸鮡。肉味鲜美，但数量较少。 |
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