A theoretical study is first made of the prediction of radiation of typical crown fire,utilizing the cylindrical geometry model.
首先研究了在城镇森林交界域,利用圆柱火焰面辐射几何模型预测典型树冠火辐射的理论依据;然后选用雪松为实验树,利用ISO9705全尺寸多功能热释放速率实验台,分别在封闭和开放空间进行了实验研究,测量了雪松的热释放速率随时间的变化规律以及雪松树冠火的辐射热通量随时间的变化。
To determine the lowest pruning heights of Pinus armandii trees which could prevent forest crown fire conversion from surface fire,combustion experiments of fine fuel were tested by 5 times with experimental equipment designed by the authors and ignition temperature were measured.
为确定可以阻止华山松林地表火向树冠火转化的最低修枝高度,测定了华山松针叶的着火点,在自行设计的燃烧床上对不同载量的华山松林细小可燃物进行了5次燃烧试验,通过分析可燃物地表火过程中垂直方向上的温度变化,将燃烧区域垂直方向上最高温度等于着火点处的高度确定为华山松的最低安全修枝高度。
Surface fire,ground fire and crown fire are the main three forest fire behaviors.
森林火灾主要包括地表火、地下火、树冠火3种蔓延形式。
The Lowest Pruning Heights of Preventing Crown Fire of Pinus armandii Trees
预防华山松树冠火的最低修枝高度探讨
Determination of the Lowest Pruning Height of Pinus yunnaneneis Trees from the Aspect of Preventing Crown Fire
从预防树冠火角度确定云南松的最低修枝高度
a forest fire that advances with great speed jumping from crown to crown ahead of the ground fire.
一种森林火灾，从树冠到树冠常常高速蔓延超过地面火。
It can put out surface fires, branch fires, leaf fires and grass fires effectively.
可对地表火、树干火、冠火和草原火实施有效扑灭,极大地提高灭火效率。
a genus of guans (turkey-like arboreal birds valued as game and food birds).
冠雉的一属（形似火鸡的一种树栖鸟，常被用于比赛和食用）。
The upper part of a tree, which includes the branches and leaves.
树冠树的上部，包括树枝和树叶
South African tree or shrub having a rounded crown.
南非灌木，圆形树冠。
The roots are more tender than the tops.
根部比树冠更柔嫩。
The uppermost layer in a forest, formed by the crowns of the trees.
树荫树林中最上面一层，由树的树冠组成
Measure light intensity above and under the mangrove canopy by using the light meter.
用光照度计量度树冠上和树冠下的平均光照度。
Pruning, by removing part of the top, alters this ratio.
修剪通过剪除部分树冠而改变根冠比。
large American shade tree with large dark green leaves and rounded crown.
高大美洲遮荫树,树叶大,深绿色,树冠圆形。
Individual trees and groups of trees to create tree roofs bring the buildings down to scale.
一棵棵的树木和一组组的树木形成的树冠？？？
Studies on the relationship between the microclimate in the crown of tea plants and their growth and development.
条栽茶树树冠小气候与茶树生长发育的关系
Measure air temperature and relative humidity above and below the mangrove canopy by using the digital thermo hygrometer.
用电子温湿计量度树冠上和树冠下的平均温度和湿度。
Let' s find some sticks to make a fire.
咱们找些树枝来生火吧。
trees that were scorched in a forest fire.
被森林大火烧焦的树木。
On the right side of the torch is an oak branch.
在火炬的右侧是橡树枝。