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wild trees
相关语句
  野生树木
    Investigation of Pests for Wild Trees in Changbai Mountains
    长白山区野生树木虫害调查
短句来源
    6 families, 37 genera, 116 species of pests for wild trees are recorded in Chang bai Mountains, including piercing-sucking pests, leaf-feeding pests, stem- pierc ing pests and root-feeding pests, which harm seedlings, leaves, fruits, seeds, b ranches, and roots of wild trees and influence growth and development of wild tr ees.
    长白山区野生树木害虫共有6目、37科、116种。 为害野生树木的害虫可分为刺吸式害虫、食叶性害虫、蛀干性害虫和食根性害虫,它们为害树木的幼苗、叶、果、种子、树干和根,会影响野生树木的生长发育。
短句来源
  野生树木
    Investigation of Pests for Wild Trees in Changbai Mountains
    长白山区野生树木虫害调查
短句来源
    6 families, 37 genera, 116 species of pests for wild trees are recorded in Chang bai Mountains, including piercing-sucking pests, leaf-feeding pests, stem- pierc ing pests and root-feeding pests, which harm seedlings, leaves, fruits, seeds, b ranches, and roots of wild trees and influence growth and development of wild tr ees.
    长白山区野生树木害虫共有6目、37科、116种。 为害野生树木的害虫可分为刺吸式害虫、食叶性害虫、蛀干性害虫和食根性害虫,它们为害树木的幼苗、叶、果、种子、树干和根,会影响野生树木的生长发育。
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  wild trees
An extrapolation of the species accumulation curve among stands indicated that the whole system, composed of more than 100 coffee plantations, may harbour as many as 34 species of wild trees.
      
Our simulations show that even partial sterility can provide very substantial reductions in gene flow into wild trees.
      
In addition, fluctuations in mature needles were shown for a set of ten wild trees.
      
Wild trees exhibit a very high variation from tree to tree, which obscures the influence of needle age and position.
      
The extractable monoterpenes from needles of two groups of trees - 4-year-old clonal and 20-year-old wild trees - were studied with respect to the influence of individual constitution, needle age, whorl position, and position on branch.
      
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The occurrence of tne apple buprestid(Agrilus malt Mats.)was first found in Fenghsien CountyShensi,in April,1974.After a prelminary investigation, the pest has been found to be distributed in such counties as Fenghsien,Liupa,Taipai and such municipalities as Paochi(regions along the weiho River)and Tungchuan. The total area of occurrence is estimated to be 15,000 mu. It has one generation a year in Fenghsien County and overwinters chiefly as mature larvae.The peak of emergence is around the middle of June.The...

The occurrence of tne apple buprestid(Agrilus malt Mats.)was first found in Fenghsien CountyShensi,in April,1974.After a prelminary investigation, the pest has been found to be distributed in such counties as Fenghsien,Liupa,Taipai and such municipalities as Paochi(regions along the weiho River)and Tungchuan. The total area of occurrence is estimated to be 15,000 mu. It has one generation a year in Fenghsien County and overwinters chiefly as mature larvae.The peak of emergence is around the middle of June.The adults are attractaed by lights but weak in flight and they show a poisson type of distribution witnin the scope of the orchard.The wilting of branches and the dying of whole trees are closely related to larval density and to the type of their distribution,but the process can be accelerated by the accompanying diseases of rotting. The apple buprestid was principally a pest of Malus prunifolia Borkn., Mains yunnanensis Schneid.,and other wild trees,but it has migrated into apple since the establishment of orchards on mountain slopes.In view of the fact that this pest is an indigenous species of China and Korea,that it is difficnlt to conduct control on wild trees and that it has spread to most of the northern orchards,it is proposed that the apple buprestid should no longer be a quarrantine object. Against this pest integrated control should be adopted,when a new orchard is to be established,the site should be selected where ther are no wild hosts.Integrated control measures are pariculary important for the adult and larval stages,protection of parasites and utilization of woedpeckers are significant.

1974年4月在陕西省凤县首先发现了苹果小吉丁虫。现巳初步查明在陕西的分布区有3县2市,即凤县、留坝、太白、宝鸡市(渭滨区)和铜川市,为害面积约一万五千亩。苹果小吉丁虫在凤县一年发生一代,主要以老熟幼虫越冬,成虫集中羽化期为6月中旬。成虫喜光,飞迁力不强,在一个果园多呈核心分布,幼虫引起枯枝死树除和幼虫密度和分布形式有关外,诱致腐烂病发生则加速了死亡。苹果小吉丁虫只分布在我国和朝鲜,是当地楸子、滇池海棠等原有害虫,苹果栽植后,逐渐飞迁到苹果树为害。不宜继续列为国内检疫对象。防治苹果小吉丁虫,要采取综合措施,建园时要选择附近没有野生寄主的地方,加强成虫期和幼虫期的防治,保护寄生蜂,招引啄木鸟。

In order to ecologically control an exotic invasive plant, Mikania micrantha H.B.K.,two experimental sites were established in Shenzhen and Dongguan of Guangdong Province where this exotic species has caused great damage to the local plant communities. After all the weeds including M. micrantha were removed by hand, nine tree species, one shrub, and one herb were planted in groups, and meanwhile fixed plots were set up for observing the biomass, coverage, density of M. micrantha and the growth and coverage of...

In order to ecologically control an exotic invasive plant, Mikania micrantha H.B.K.,two experimental sites were established in Shenzhen and Dongguan of Guangdong Province where this exotic species has caused great damage to the local plant communities. After all the weeds including M. micrantha were removed by hand, nine tree species, one shrub, and one herb were planted in groups, and meanwhile fixed plots were set up for observing the biomass, coverage, density of M. micrantha and the growth and coverage of the other planted and wild trees, shrubs and herbs. The results indicated that: (1) the crown diameter of Acacia auriculaeformis, Acacia mangium in Shenzhen and that of Mytilaria laosensis, Cinnamomum camphora in Dongguan increased most rapidly, and thus these tree species were suitable to control M. micrantha by the method of afforestation the herb Wedelia chinensis grows rapidly and can expel M. micrantha in the short run (2) the relationship between the biomass of M. micrantha and the total coverage of the surrounding plants very significantly followed the negative exponential curve model (3) the coverage (or density) of M. micrantha very significantly (or significantly) negatively correlated with the total coverage of the other plants, following the linear models very well and (4) according to (2) and (3), the coverage of the other plants can serve for a useful and convenient measurement index of the ecological control benefit. It may be an effective sustainable method for ecologically controlling the exotic species to cultivate well-growing trees, shrubs and herbs including wild plants so as to establish a multi-layer stable community structure.

为了生态防除外来入侵植物薇甘菊 ,在受害严重的深圳、东莞设置试验地 ,在人工除草 (包括全部薇甘菊 )后搭配种植 9个树种、1种灌木和 1种草本 ,并设置固定样方调查薇甘菊的生物量、盖度、密度及其周围人工种植的、野生的乔灌草植物生长量、盖度。初步研究表明 :(1)深圳试验地大叶相思、马占相思和东莞试验地米老排、樟树的冠幅增长最快 ,宜作为防除薇甘菊的造林树种 ;蟛蜞菊生长迅速 ,可在短期内有效抵御薇甘菊侵害 ;(2 )薇甘菊生物量与其它植物总盖度的关系符合负指数曲线模型 ;(3)薇甘菊盖度、密度与其它植物总盖度均呈极显著或显著负相关 ,能很好地拟合线性模型 ;(4 )据 (2 )、(3) ,其它植物总盖度以及包括其内的林木冠幅 (或郁闭度 )、草本层盖度 ,可作为评价一个植物群落抵御薇甘菊为害的能力或一种生态防除措施的效能的实用而方便的指标。种植当地适生乔灌草植物或促进野生植物生长 ,建立稳定的复层群落结构 ,可持续有效地抵御薇甘菊的侵害。

6 families, 37 genera, 116 species of pests for wild trees are recorded in Chang bai Mountains, including piercing-sucking pests, leaf-feeding pests, stem- pierc ing pests and root-feeding pests, which harm seedlings, leaves, fruits, seeds, b ranches, and roots of wild trees and influence growth and development of wild tr ees. In order to reduce environmental pollution and maintain ecological equilibr ium, IPM principle should be used in the control of pests, and measures with bio logical control...

6 families, 37 genera, 116 species of pests for wild trees are recorded in Chang bai Mountains, including piercing-sucking pests, leaf-feeding pests, stem- pierc ing pests and root-feeding pests, which harm seedlings, leaves, fruits, seeds, b ranches, and roots of wild trees and influence growth and development of wild tr ees. In order to reduce environmental pollution and maintain ecological equilibr ium, IPM principle should be used in the control of pests, and measures with bio logical control as the base and chemical control as the assistance should be tak en.

长白山区野生树木害虫共有6目、37科、116种。为害野生树木的害虫可分为刺吸式害虫、食叶性害虫、蛀干性害虫和食根性害虫,它们为害树木的幼苗、叶、果、种子、树干和根,会影响野生树木的生长发育。同时提出虫害的防治应采用“IPM”原则,以生物防治为主,辅助以化学防治,以减少环境污染、维持生态平衡。

 
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