外来树种

一些外来树种发生了树冠干枯和植株枯死。

Some exotic tree species died and its crown was withered .

科尔沁沙地极端气候条件对外来树种影响的研究

Influence of Extreme Climatic Condition on Exotic Tree Species in Horqin Sandy Land

应用GIS进行外来树种生物入侵监测与早期预警

Application of GIS in Monitoring and Early Warning of Bio-invasion of Exotic Trees

四倍体刺槐Robiniapseudoacacia是我国引种驯化历史较久的外来树种，为人工诱交植株，分速生型和饲料型。

Robinia pseudoacacia , a domesticated exotic species with a long history , is an artificially induced variation divided into fast growing and fodder types .

元谋干热河谷几种外来树种在旱季的光合特点

Photosynthetic characteristics of several exotic species in dry season in Yuanmou County

外来树种生物入侵研究现状与进展

Current Status and Progress of Studies in Biological Invasion of Exotic Trees

外来树种信息系统的构建

The Foundation of Geographic Information System about Exotic Tree Species

榆林沙区乡土树种与外来树种的和谐应用

The Harmonious Application of Native Tree and Exotic Tree in Yulin Sandy Region

适当引进外来树种；

Introduce exotic tree species properly ;

作者总结要恢复这个外来树种的人工林的多样性必须进行抚育。

The authors conclude enrichment planting is needed to restore forest diversity in this exotic-tree plantation .

不合理引进外来树种，而且树种种植结构不合理或管理粗放，导致一些外来的或原次要的病虫害严重发生。

Which resulted in the occurence of some foreign or secondary pests ' damage to the forest .

乡土树种有50种（63.3%）、外来树种29种（36.7%）。

There were 50 local species ( 63.3 % ) and 29 foreign species ( 36.7 % ) .

绿化植物中乡土树种16种，外来树种196种，其比例为4：49。

There are 16 kinds of native trees , and 196 kinds of exotic species , with ratio 4:49 .

在外来树种桉树人工林经营过程中，普遍存在着林地群落结构简单、生物多样性减弱和生态环境退化等问题。

It is a widespread problem in Eucalyptus plantations that the plant community is simple in structure and low in biodiversity status .

丽水市的外来树种有217种，其中国外植物有161种，省外的有56种。

There are 217 exotic species in Lishui city , including 161 species from abroad and 56 species from the Provincial . 5 .

据卡尔曼介绍，云杉这种植物对气候变化十分敏感，而且长期以来一直被视为瑞典山区的“外来树种”。

Spruces , which according to Kullmann offer rich insight into climate change , had long been regarded as relatively newcomers in the Swedish mountain region .

本文介绍了南非园林绿化上常用的外来树种蓝花楹、美丽异木棉、火焰木、茶花、簕杜鹃等；

Here we introduces common exotic plant species to South Africa , such as Jacaranda acutifolia , Ceiba insignis , Spathodea campanulata , Camellia japonica , Bougainvillea spectabilis , etc.

基调树种中有常绿乔木2种、落叶乔木7种、落叶灌木1种，属于乡土树种的7种，外来树种近占一半；

Among the 12 ones 2 species are evergreen trees , 7 broad leave trees , 1 shrub ; 7 of them from local area and nearly a half species are introduced from outside areas .

当今一些居住小区景观建设，为了经济利益，盲目追求暂时的视觉效果，忽视了人与自然的和谐共处，忽视了经济适用性原则；一些为了吸引大众眼球，追求异域风情，盲目使用外来树种。

Currently , the sake of economic benefits , some residential areas landscape construction blindly pursue the temporary visual effects , ignoring the economically affordable principles , neglecting the harmony between the human and nature .

因其抗性强、耐干旱瘠薄、适应性广、种植容易、萌芽力强、速生高产等特点，成为我国最重要的速生商品林外来树种，在我国南方大面积种植。

Eucalyptus has become the most important commercial forest of fast-growing alien species and planted in large area of Southern China because of its characteristics such as strong resistance , tolerance to drought and barren , wide adaptability , planting easily , strong sprout capacity and high yield .

东北地区外来针叶树种引种现状及发展策略

Present Condition and Development Strategy of Introduction of Exotic Needle-leaved Tree Species in Northeastern China

外来针叶树种在中温带半干旱区林业生态环境建设及丰富该区种质资源中发挥着极为重要的作用。

Exotic conifers have played a very important role in forestry ecological environment construction and woody plant resources .

为丰富科尔沁沙地针叶树种的多样性，“009”项目引种外来针叶树种在科尔沁沙地进行育苗造林。

To enriching variety of conifer in Korqin sandy land ," 009 " project introduce exotic conifers for nursery and plantation .

边坡绿化植物选择应以适应性强的乡土植物为主，适当引进外来优良树种，并根据不同的边坡类型采取不同的绿化措施等构思。

The slope plant choice should be based on native plants and introduced extrinsic vegetation properly . Moreover , according to different types of slope , different planting measures were taken .

「这是外来入侵树种影响英国野生动物的最戏剧化例子。那圣洁的孩子在乏味的云层和倏忽变幻的浮光掠影中嬉戏微笑。

This is now the most dramatic example of an alien plant invader affecting wildlife in Britain , ' he told The Observer . There smiles the Divine Child among his playthings of unmeaning clouds and ephemeral lights and shadows .

黄土高原气候干旱，植被稀少，适宜造林树种贫乏，引进外来适生树种，丰富本地区树种资源具有重要的生产意义。

With dry climate , scarce afforestation and trees on Loess Plateau , it is great significance in production to introduce trees on foreign land to enrich the local resources of trees .