树线

树线地带落叶松混交林和岳桦林的净生产量也出现急剧降低，但根系生产量比例则较低海拔同类林分高，有利于对土壤中水分和养分的吸收。

Net primary productivities of larch mixed forest and birch forest decreased sharply at treeline in comparison with lower altitudinal stands , whilst the ratio of root production was much higher than that of lower altitude . This made it profitable to take water and nutrients in soil .

近些年长白山北坡的气温在渐渐上升，因此导致了高山树线的上升。

In resent years , the annual mean temperature near Changbai Mountain is rising , which has led to the tree line ascending .

横断山区高山树线地带冷杉生长过程及规律的研究

A study of the growing process of fir along the alpine timberline in heng - Duan mountain area

关于为什么在较高树线处树木迅速停止生长的原因，仍然没有一个一致的解释。

There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline .

对比国内外关于高山带景观划分的多种观点，采用气候树线以上部分为高山带的划分方法。

Based on the introduction of some theories about mountain research , the demarcation of landscape boundaries near alpine belt was discussed in this paper .

树线、林缘、郁闭林内三种不同生境条件下乔木光合作用的对比表明，林缘的生境条件最适合植物光合作用。

A comparison of photosynthesis among tree line , forest edge and forest interior shows that the habitat of forest edge is most favorable for photosynthesis .

为了揭示高山树线随着气候变化而变化的现象，对长白山的高山树线变化趋势进行了研究。

In order to decipher phenomenon of tree line changing with climate variety , the trend of tree line on the northern slope of Changbai Mountain was studied .

在许多半干旱地区，也有一个较低的树线，在这个区域内，通常由于缺水，森林在沙漠的下缘穿过。

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 .

特别，邻接树图和线图是我们推广的特殊情况。

Especially , the adjacent tree graph and line graph are both included as special cases of our generalization .

然后建立一个路网模型，在对路网模型进行了由网到树再到线的简化，以及车站等级划分的基础上以算例说明了模型的求解算法。

At last , the rail network model is built up . Effectiveness of model is verified with the simplification from network to tree then to line and the classification of the station .

研究了基于四叉树结构的线矢量数据的存储，解决了线矢量数据的分割、抽稀和不同分辨率的无缝拼接问题。

The paper researches the storage of line vector data based on quad-tree architecture , solves the problems of line vector data dividing and sparse and recovers the cracks between different LOD ( lever of detail ) .

将整个路网作为一个整体，合理地进行由网到树再到线的结构图简化，并建立了不同情景下的旅客列车直达去向基本准则。

With the entire road network as a whole , the paper simplifies network structure , reasonably from the network to the tree , till to the line ; and build basic guidelines to through train direction passenger in different scenarios .

树倒在铁路线附近，造成更多的火车晚点。

Trees had fallen near the railway line , causing more delays .

基于生成树的多轮廓线重构方法

Reconstruction from Multiple Branching Contours on Minimum Spanning Tree

使变成或制成截头树单丝不成线，孤树不成林。

One strand of silk does not make a thread ; one tree does not make a forest .

皮特：不，他们显然有自己的家族树（家谱），他们顺着家族树线或家庭家族世系，但是他们相当好地分散遍及于所有不同德种族和不同文化。

PP : No , they obviously run in family trees , along family tree lines or family lines , but they 're pretty well distributed throughout all different cultures and races .