At the upper timberline the trees begin to become twisted and deformed.
在树带界线的上限区域，树木开始弯曲变形。
This rapid zone of transition is called the upper timberline or tree line.
这种快速的过渡地带被称为“上树带线”或“林木线”。
There are some areas, however, where broadleaf deciduous trees form the timberline.
然而，在一些地区，阔叶落叶树木形成了林木线。
There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline.
对于为什么树线以上的树木会突然停止生长，至今还没有一个公认的解释。
In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.
在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。
The upper timberline, like the snow line, is highest in the tropic and lowest in the polar regions.
上行树带界线，比如雪线，在热带最高在极地最低。
There is still no universally agreed-on explanation fir why there should be such a dramatic cessation of tree growth at the upper timberline.
目前还没有一个普遍认同的解释来说明为什么会在树带界线上出现树木停止生长这种戏剧化的现象。
This paper briefly outlined the advance of dendroecology research in terms of forest disturbance, population dynamics, forest structure, forest regeneration patterns and alpine timberline.
文中简要概述了树轮分析在森林干扰、群落动态、森林结构、林分更新方式以及高山林线研究方面的进展。
This paper briefly outlined the advance of dendroecology research in terms of forest disturbance, population dynamics, forest structure, forest regeneration patterns and alpine timberline.
文中简要概述了树轮分析在森林干扰、群落动态、森林结构、林分更新方式以及高山林线研究方面的进展。
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