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林木     
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  forest
    STUDIES ON DISEASES OF PRINCIPAL FOREST TREES IN KUNMING DISTRICT New Hosts and Distribution of Five Forest Tree Diseases
    昆明地区主要林木病害研究——五种林木病害的新寄主和新分布
短句来源
    Preliminary Studies on Forest Quarantine Insect Pest in Gannan County
    甘南县林木检疫害虫初步研究
短句来源
    Studies of Fir Rot Disease. Ⅲ. Rot Degrees of Fir Forest Trees
    冷杉腐朽病研究:Ⅲ.冷杉林木腐朽程度的探讨
短句来源
    Research of Reproduction and Age Group of Bandicoot among Main Forest Tres
    主要林木害鼠年龄组划分与繁殖的研究
短句来源
    The forest tree trunk-boring insect pests on forest trees were investigated during 2004~2006, a total of 47 species belonging to 1 order, 8 families and 41 genera were found in Yueqing City, Zhejiang Province.
    于2004~2006年间对浙江省乐清市林木蛀干害虫种类进行调查,结果显示该辖区共有47种蛀干害虫,隶属于8科41属。
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  tree
    STUDIES ON DISEASES OF PRINCIPAL FOREST TREES IN KUNMING DISTRICT New Hosts and Distribution of Five Forest Tree Diseases
    昆明地区主要林木病害研究——五种林木病害的新寄主和新分布
短句来源
    The forest tree trunk-boring insect pests on forest trees were investigated during 2004~2006, a total of 47 species belonging to 1 order, 8 families and 41 genera were found in Yueqing City, Zhejiang Province.
    于2004~2006年间对浙江省乐清市林木蛀干害虫种类进行调查,结果显示该辖区共有47种蛀干害虫,隶属于8科41属。
短句来源
    Forest Biodiversity and Natural Control of Tree Pests.
    森林生物多样性与林木害虫的自然防治
短句来源
    A Study on the Population Differentiation of Tree pathogenic Fungi
    林木病原真菌的群体分化研究
短句来源
    ADVANCE IN THE STUDY ON MECHANISM OF TREE RESISTANCE TO INSECT
    林木抗虫机制研究进展
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  forest tree
    STUDIES ON DISEASES OF PRINCIPAL FOREST TREES IN KUNMING DISTRICT New Hosts and Distribution of Five Forest Tree Diseases
    昆明地区主要林木病害研究——五种林木病害的新寄主和新分布
短句来源
    The forest tree trunk-boring insect pests on forest trees were investigated during 2004~2006, a total of 47 species belonging to 1 order, 8 families and 41 genera were found in Yueqing City, Zhejiang Province.
    于2004~2006年间对浙江省乐清市林木蛀干害虫种类进行调查,结果显示该辖区共有47种蛀干害虫,隶属于8科41属。
短句来源
    Progress in Study on Anthracnose from Forest Tree
    林木炭疽病研究进展
短句来源
    Preliminary Study on the Repelling Effects of 3 Kinds of Forest Tree Secondary Materials on Eggs Produced by Pseudophacopteron canarium
    三种林木次生物质对星室木虱产卵驱避作用的初步研究
短句来源
    Advances in Disease Resistant Genetic Engineering in Forest Tree
    林木抗病基因工程研究进展
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  forest trees
    STUDIES ON DISEASES OF PRINCIPAL FOREST TREES IN KUNMING DISTRICT New Hosts and Distribution of Five Forest Tree Diseases
    昆明地区主要林木病害研究——五种林木病害的新寄主和新分布
短句来源
    Studies of Fir Rot Disease. Ⅲ. Rot Degrees of Fir Forest Trees
    冷杉腐朽病研究:Ⅲ.冷杉林木腐朽程度的探讨
短句来源
    The forest tree trunk-boring insect pests on forest trees were investigated during 2004~2006, a total of 47 species belonging to 1 order, 8 families and 41 genera were found in Yueqing City, Zhejiang Province.
    于2004~2006年间对浙江省乐清市林木蛀干害虫种类进行调查,结果显示该辖区共有47种蛀干害虫,隶属于8科41属。
短句来源
    Present Status of Studying the Antifungal Active Substances in Forest Trees
    林木中抗真菌活性物质研究现状
短句来源
    the southwest of China, including 15species fruit trees, 9 ornamental plants. 7 forest trees. 4 leguminous plants and 1 food crop.
    四川有36种植物表现缺铁症,其中包括15种果树,9种观赏植物,7种林木,4种豆科植物和1种粮食作物。
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  forest
Moreover, a backward reasoning forest of a reachable marking was generated for explicitly representing reachable paths in RBS.
      
Growth Model System for National Continuous Forest Inventory
      
A Growth Model System is developed for data updating and forecasting of the national continuous forest inventory.
      
Its design is based on the inherent forest growth laws, and its parameters are estimated by modern regression methods.
      
It is suitable for forest resource information updating and forecasting for a large region, e.g., a province.
      
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  tree
This is done by proving that a well-known method, the construction of a Perron Tree, can be applied to a larger collection of subsets of the unit circle than was earlier known.
      
If a collection of subsets are chosen at random from the power set of a finite setX, we give the probability that the collection is a tree of subsets ofX.
      
Given a complete graph with vertex setX and subsetsX1,X2,…,Xn, the problem of finding a subgraphG with minimum number of edges such that for everyi=1,2,…,n, G contains a spanning tree onXi, arises in the design of vacuum systems.
      
The paper proves that if G is a k-tree, then the bandwidth B of the complement of G is given by
      
In this paper the choosability of outerplanar graphs, 1-tree and strong 1-outerplanar graphs have been described completely.
      
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  forest tree
This paper presents a brief review of traditional methods of studying genetic variation in forest tree species and introduces a new, integrated population genomics approach.
      
Therefore, only the heterotrophic part of tree biomass determines annual carbon losses in a forest tree population.
      
According to genetic variation parameters, three out of six populations (Akdagmadeni-Yozgat, Refahiye-Erzincan and Vezirkopru-Samsun) appear to be preferable populations for genetic conservation and forest tree breeding programs.
      
Plant parasitic nematodes from a forest tree nursery in southern Spain with some notes about the influence of soil storage on th
      
___TAGSTART___BR___TAGEND___A nematological survey was carried out in a forest tree nursery in Andujar, southern Spain.
      
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  forest trees
The results showed that the forest trees grew in a clumped pattern in the stage dominated by the pioneer trees, and that the trees were distributed in a random pattern in the stage dominated by the companion trees or in the mature stage.
      
From population genetics to population genomics of forest trees: Integrated population genomics approach
      
Reducers in the Plant Debris of Wild Fruit and Forest Trees and Shrubs on Sandy Lands in the Semidesert Zone of Stavropol Krai
      
Since the shola forest trees are characterized by their short stature with low to medium girth, about 89% of the total number of deadwood is of the size ranging from 10.1 cm to 40.0 cm in diameter.
      
Some progresses of transferring and expressing Bt toxin gene in forest trees are offered with a discussion on the limits and future prospects of using Bt products in forestry.
      
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  其他


Haprust, caused by Thekopsora areolata (Fr.) Magn., is a serious disease of spruce, Picea asparata Mast. and P. purpurea Mast. in Sun Chuen Basin of Szechuen province. The percentages of infected trees have been found about 64.5 for P. asperata and 30.7 It seems, Environmental conditions influence profoundly on the epidermiclogy of this disease. In general, spruce plantation in the sand banks are heavily infested; trees at within 3210—3400 meters above sea level are seriously damaged; and solitary trees as well...

Haprust, caused by Thekopsora areolata (Fr.) Magn., is a serious disease of spruce, Picea asparata Mast. and P. purpurea Mast. in Sun Chuen Basin of Szechuen province. The percentages of infected trees have been found about 64.5 for P. asperata and 30.7 It seems, Environmental conditions influence profoundly on the epidermiclogy of this disease. In general, spruce plantation in the sand banks are heavily infested; trees at within 3210—3400 meters above sea level are seriously damaged; and solitary trees as well as the trees alone the edge of the forest are more liable subjected to the attached of the rust. Picea purpurea is mote resistant to Haprust than P. asperata. It has been suggested that the presence of abundant resin on the cone of P. purpurea may be attributed for this disease resistance. The damages produced by Haprust on spruce are: (1) delaying the time of reforestation; (2) weakening the spruce seedlings and (3) lowering the quality of the seed as well as the percentage of seed germination, a tentative schedule of control measures has been proposed.

1.云杉球果銹病(Thekopsora aerolata Fr.Magn.)为云杉林木球果重要病害。在四川小金川流域普遍为害着。为害云杉属之粗云杉(P.asperata)和紫果云杉(P.purpurea)。云杉林分感染率粗云杉为64.5%,紫果云杉为30.7%。在云杉立木上球果感染率,粗云杉占27.1%,紫果云杉占7.4%。2.云杉球果銹病特征是在鱗片上出現許多銹孢子器,鳞片外张,故病果在长度和寬度上均較健果为大。严重感病的球果以正面鳞片上銹孢子器为多,其他等級的球果,却以反面鳞片上銹孢子器为多。3.云杉球果銹病出現前存在潛隐阶段,粗云杉在8月中旬、紫果云杉在8月下旬病果已有出現,直至9月下旬达到最高峯。4.在各云杉林地类型中,以河滩——云杉林发病率最高。云杉立木类別中,以林綠木、孤立木球果锈病最多。在山之中部,海拔3,210—3,400米內,球果感染率最大。同时,西坡和西南坡中感病严重。5.云杉林木发育級中,Ⅲ級木球果銹病最多,Ⅱ級木次之,Ⅰ級木更次之。发病率与年龄关系,表現在Ⅸ龄級(粗云杉)和Ⅹ龄級,Ⅶ龄級(紫果云杉)达到最高峯。6.立木树冠方向上,紫果云杉球果感染率次序为西—南—...

1.云杉球果銹病(Thekopsora aerolata Fr.Magn.)为云杉林木球果重要病害。在四川小金川流域普遍为害着。为害云杉属之粗云杉(P.asperata)和紫果云杉(P.purpurea)。云杉林分感染率粗云杉为64.5%,紫果云杉为30.7%。在云杉立木上球果感染率,粗云杉占27.1%,紫果云杉占7.4%。2.云杉球果銹病特征是在鱗片上出現許多銹孢子器,鳞片外张,故病果在长度和寬度上均較健果为大。严重感病的球果以正面鳞片上銹孢子器为多,其他等級的球果,却以反面鳞片上銹孢子器为多。3.云杉球果銹病出現前存在潛隐阶段,粗云杉在8月中旬、紫果云杉在8月下旬病果已有出現,直至9月下旬达到最高峯。4.在各云杉林地类型中,以河滩——云杉林发病率最高。云杉立木类別中,以林綠木、孤立木球果锈病最多。在山之中部,海拔3,210—3,400米內,球果感染率最大。同时,西坡和西南坡中感病严重。5.云杉林木发育級中,Ⅲ級木球果銹病最多,Ⅱ級木次之,Ⅰ級木更次之。发病率与年龄关系,表現在Ⅸ龄級(粗云杉)和Ⅹ龄級,Ⅶ龄級(紫果云杉)达到最高峯。6.立木树冠方向上,紫果云杉球果感染率次序为西—南—东—北。在树冠上部較中部和下部感病为多。7.粗云杉較紫果云杉抗病力为弱。8.云杉球果銹病为害性表現在以下几方面:(1) 影响云杉更新,(2) 影响云杉种子貭量:一感病球果提早枯裂,二病果种子发芽率降低,三种子产量減少,重量降低。9.初步防治意見:(1) 勿采病果,(2) 烧燬病果,(3) 改变森林环境条件,(4) 砍除稠李。10.存在問題:进一步探討轉株寄主对病害发生关系、病菌生活史以及发病規律性。

The geometrid Apocheima sp.is one of the worst pest of the locust tree in Mei County.It apparently prefers the locust tree,but also devastates the near-by apple and pear trees.This paper reports the results of our studies on the bionomics and control measures of this insect from 1971 to 1974.This insect has only one generation a year in Shensi Province and overwinters.as a pupa encased in a thick cocoon under the ground.The adult emerges in late February the next year and lays eggs on the top of the locust tree.Larvae...

The geometrid Apocheima sp.is one of the worst pest of the locust tree in Mei County.It apparently prefers the locust tree,but also devastates the near-by apple and pear trees.This paper reports the results of our studies on the bionomics and control measures of this insect from 1971 to 1974.This insect has only one generation a year in Shensi Province and overwinters.as a pupa encased in a thick cocoon under the ground.The adult emerges in late February the next year and lays eggs on the top of the locust tree.Larvae hatch in early April and they have the habit of spinning silk threads hanging down from the tree and spreading to another tree by wind.The full-grown larvae move downward to dig into the ground in late May and after 40 days of pre-pupal stage they pupate under ground in thick cocoons in late July.The results of our study show that the most effective control measure is to dust BHC over the ground surface at the beginning of emerging stage of the adults.

刺槐尺蠖是陕西省眉县地区刺槐林的主要害虫。经初步调查,其寄主植物包括林木、农作物和果树等34种,其中刺槐、苹果和梨受害最重。该虫一年发生一代,以结茧蛹在土中过冬。翌年2月下旬开始羽化,3月中旬至4月上旬为盛期,末期于4月中旬。成虫雌雄异型。雄蛾有翅善飞,有趋光性。雌蛾无翅,仅能缓慢爬行。雌蛾一般羽化、交尾和产卵一日内完成。卵多产于一年生枝梢端部阴面,卵粒排列成行,数行或数十行成一卵块,卵块平均有卵462粒。初孵幼虫有吐丝下垂、随风飘荡扩散的习性。幼虫为害期在4月上旬至5月上旬,老熟幼虫于5月中旬开始下树。 根据此虫生物学特性,以地面喷、撒六六六粉消灭成虫效果最好,幼虫幼龄阶段实行树上喷六六六粉也是可行的防治措施。

In this paper,the writers report 14 species of the genus Phaeoramularia collected in China.Amongst them,there are 1 new record,5new combinations and 4 new species.The historical survey of the genus Phaeoramularia has briefly beenmade.Detailed descriptions and figures for each species,as well as lat-in diagnoses for the new species,are given in the report.The typespecimens are deposited in the Herbarium of the Institute of Microbiol-ogy,Academia Sinica,Beijing.

色链隔孢属(Phaeoramularia)是半知菌类中暗丛梗孢菌类(Dematiaceoushyphomycetes)的一个小属,仅有30多个种,都是植物寄生真菌。某些种是作物、林木、果树和蔬菜的严重病害的病原菌,侵染植物引致严重的为害。本文报告我国色链隔孢属共14个种,其中1个是新记录,5个是新组合,4个是新种。

 
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