外来植物

Yellow-flowered European plant that grows on old walls and in waste places; an adventive weed in North America.

开黄花的欧洲杂草，长在老墙上和荒地上；是一种出现在北美的外来植物。

Deciduous clump-forming Asian shrub or small tree; adventive in the eastern United States.

每年落叶的丛生的亚洲灌木或小树；移到美国东部的外来植物。

Because of the exotic weeds with strong reproductive capacity, adaptability and adversity-resistance, and short of strong competitive plants and natural enemies in the local area the exotic weeds such as Aiternanthera philoxeroides, Eichhornia crassipes, Ageratina adenophorun and Ageratum conyzoides etc.

由于农林牧渔业生产、绿化美化等目的有意引进；或旅游、交通工具等无意引入；或自身扩散传播的自然入侵，外来植物一旦逃逸人为控制进入自然生态系统并能自行繁殖和扩散，形成野化种群，变成外来入侵植物，成为危害农牧业生产和破坏生态环境的有害杂草。

Result The results showed that the invasion of Solidago canadensi had a large effects on species, composing and vegetable diversity of plant community on island.

结果］结果表明，外来植物加拿大一枝黄花的入侵已经对海岛植物群落的种类及其构成、物种丰富度和植物多样性带来了较大程度的影响。

Since the , most literature on predicting weediness or invasiveness of plants has focused on the characteristics of the plant , or on the invaded environment .

20世纪90年代以来，关于植物入侵争论的焦点集中于入侵植物本身的生物学特点或入侵生境特点，然而，争议多于结论，至今未能找出有效预测外来植物入侵性的答案。

Since the 1990s , most literature on predicting weediness or invasiveness of plants has focused on the characteristics of the plant , or on the invaded environment .

20世纪90年代以来，关于植物入侵争论的焦点集中于入侵植物本身的生物学特点或入侵生境特点，然而，争议多于结论，至今未能找出有效预测外来植物入侵性的答案。

In order to understand the influence of alien plant in Guanzhong region and pretect local agriculture,we would study the allelopathic effects and their risk assessment of Erigeron annuus,Amaranthus retroflexus and Eleusine indica for main crops.

为了解外来植物对本地区栽培作物的影响，保障农业生产的持续安全性，我们对一年蓬、反枝苋、牛筋草3种关中地区常见外来入侵植物对关中地区主要栽培作物的化感作用和危害风险进行了评价。

Results showed that the alien plant of Mimosa bimucronata has a lowest SPAD value among all species determined. The average SPAD value of Gymonosperae was higher than that of Angiospermae.

结果表明，外来植物簕仔树的SPAD值远低于其他植物；裸子植物的PSAD平均值高于被子植物。

Future studies are recommended to compare the impacts across multiple scales and multiple ecosystems; intensify mechanical studies of the impacts; link the impacts on biodiversity and ecosystem processes; and explore the mutualistic interactions between soil ecosystems and exotic plants.

今后，加强多尺度和多生态系统的比较研究、机制性研究、生物多样性和生态系统过程的整合性研究及土壤生态系统对植物入侵的反馈研究是评价外来植物入侵对土壤生态系统影响的发展趋势。

We grew fifteen plant species with and without non-coevolved polyphagous locusts and cosmopolitan, polyphagous aphids.

现在，对15个植物物种（包括以前已经表现出生存范围快速扩展的6个物种及9个相关的本地种）的生长状况所做的一项研究表明，向北-西欧扩展其生存范围的外来植物物种与本地种相比，暴露于地面下敌人和地面上广谱草食动物的机会都要少一些。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。