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forest     
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  森林
    Happening Law and Preventive Measures of Forest Fire in Lishui Area
    丽水地区森林火灾发生规律和预防措施
短句来源
    Notes of the New Forest Bests in Fujian Province and Discussion on the Cause of Their Occurence
    福建省森林新害虫记述及其发生原因探讨
短句来源
    RELATIONSHIP OF FOREST DISEASE EPIDEMIC TO MANAGEMENT MEASURES
    森林病害流行与经营措施的关系
短句来源
    RESEARCH OF FOREST ENTOMOLOGY AND ITS APPLICATION
    森林昆虫学的研究和应用
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    Ecology and Management of Forest Insects
    《森林昆虫的生态学与管理》
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  林业
    Forest Health Theory and Sustained Control of Forest Disease and Pest --Thinking About American Forestry Observation
    森林健康理论与病虫害可持续控制——对美国林业考察的思考
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    TECHNOLOGY OF CHEMICAL WEEDING IN FOREST NURSERY
    林业苗圃化学除草技术
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    Application of information attenuation theory in the forest pest survey
    信息衰减理论在林业有害生物调查中的实际应用初报
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    Bursaphelenchus xenophiles, a destructive invasive alien forest pest in China, has had a devastating effect on sustainable forest development and ecological safety.
    松材线虫(Bursaphelenchus xenophiles),是影响中国林业可持续发展和生态安全、危害极大的森林外来有害生物。
短句来源
    Forest firing is most destructively and natural disaster in forestry disaster, which seriously effect society, environment and economy and bring to large loss to national property.
    森林火灾作为林业灾害中对社会、环境及经济发展影响范围最广和破坏性最大的一种自然灾害,给国家和人民的生命财产带来了巨大的损失,对地球的生态系统和人类的生存环境产生了重要的影响。
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  林木
    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
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    Preliminary Studies on Forest Quarantine Insect Pest in Gannan County
    甘南县林木检疫害虫初步研究
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    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
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    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
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    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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  林分
    Proposal for Design Forest Structure Resisting to Poplar Stem Borers
    抗杨树蛀干害虫林分的设计雏议
短句来源
    In the closed forest with crown density at 70%,smoky agent Dima and lindane in 18kg/hm2 to control 1st -3rd instar larvae can generate 90% in control effect.
    在郁闭度0.7以上的林分,用18 kg/hm2敌马烟剂、林丹烟剂防治1~3龄幼虫,防效达90%。
短句来源
    A relation between forest combustible parameters and stand characteristics
    森林可燃物参数与林分特征关系
短句来源
    Diversity and stability of the arthropod communities in different forest types of the bamboo Phyllostachys heterocycla cv. pubescens
    不同林分类型毛竹林节肢动物群落的多样性与稳定性
短句来源
    The result of controlling 20 years old injured forest of 7.4 ha in Suiyang forestry bureau showed that the injured rate of forest reduced by 98.49%, and control cost is 8.10 yuan per ha.
    通过绥阳林业局会川经营所7.4 ha 20a生被害林的防治结果表明,使林分被害率在原来的基础上下降了98.49%,而防治总成本仅为8.10元/ha。
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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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During 1955 and 1956 the pine barkbeetle, Myelophilus Piniperda L., seriously injured pine trees on the hills near by Kiang-Kan section at Hangchow, where the pine logs (firewoods)were piled for a considerable time before selling out. Most of the logs came down from Chien Teh (建德) and Zueng-An (淳安) along the Tsiang Tang River and were infested with immense number of the barkbeetle larvae. Results of study by the writers indicated that the serious infestation of pine shoots was due to spread of the beetles emerged...

During 1955 and 1956 the pine barkbeetle, Myelophilus Piniperda L., seriously injured pine trees on the hills near by Kiang-Kan section at Hangchow, where the pine logs (firewoods)were piled for a considerable time before selling out. Most of the logs came down from Chien Teh (建德) and Zueng-An (淳安) along the Tsiang Tang River and were infested with immense number of the barkbeetle larvae. Results of study by the writers indicated that the serious infestation of pine shoots was due to spread of the beetles emerged from the piles of log. The pine barkbeetle at Hangchow gave one brood a year, overwintering in pine shoots; up to late March and April they came down to the logs and dead woods in the forest, and made parent galleries between the bark and sapwood. The barkbeetle would take about a month to complete its life cycle. The results of trials and recommendations on control of the pest are given in the following: 1. Separate applications of 25% DDT emulsion, 50% wettable DDT and 6% wettable 666 on the pine logs at a rate of 1:100 dilution still gave 68%, 82% and 66% mortalities respectively on the 20th day. Therefore it was suggested that spraying any one of the above mentioned chemicals three times at 20-day intervals from late April to end of June would kill the emerged beetles. 2. To control the beetles in the pine shoots with 1: 60—1: 100 dilution of 6% wettable 666 was quite promising. 3. Flaming the pine logs or dead woods in April or May (the breeding period of the barkbeetles) for 2 minutes gave 100% mortality. Putting trap trunks in the forest and removering barks before transportation at Chien Teh and Zueng An were suggested.

1.松小蠹虫在杭州地区猖獗成災,主要是由于从錢塘江上游远來的松柴,攜带了大量的松小蠹虫幼虫而造成的;因此若能在松柴產地剝掉樹皮后,再行运輸是最有效的防治措施。2.根据初步观察此虫在杭州一年發生一代,新成虫在5月下旬到9月間为害当年生松梢;越冬成虫从3月下旬起离开越冬松梢,蛀進二年生松梢的梢端取食,并蛀入半枯死樹和衰老樹樹干或柴堆樹皮下產卵。3.为歼滅杭州地区松小蠹虫,根据試驗結果我們認为可采取下列几个措施:(1)自錢塘江上游运來的松柴在成虫未羽化前,進行噴藥,用1:100的25%DDT乳剂、50%可湿性DDT或6%可湿性666,每隔20天噴藥1次,以殺死羽化的成虫。(2)冬季1,2月间砍伐衰老松樹,在山区設置餌木誘集成虫產卵,然后集中处理,進行噴藥或燒灼。(3)新成虫的羽化盛期开始时,在松樹上噴射60—100倍的可湿性666液,毒殺为害枝梢的成虫以保护松樹生長。

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—东—北。在树冠上部較中部...

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。

Gravitarmata margarotana Hein. is an important forest insect pest of Shensi. It attacks four species of pine and especially prefers Pinus tabulaeformis which is sometimes severely injured.According to field observation, this insect has one generation a year in North Shensi with pupae hibernating in cocoons. The moths begin to appear in mid-April iind are most abundant in late April and early May. The larvae attack host plants from early May to early June, being most serious in the middle part of May. A...

Gravitarmata margarotana Hein. is an important forest insect pest of Shensi. It attacks four species of pine and especially prefers Pinus tabulaeformis which is sometimes severely injured.According to field observation, this insect has one generation a year in North Shensi with pupae hibernating in cocoons. The moths begin to appear in mid-April iind are most abundant in late April and early May. The larvae attack host plants from early May to early June, being most serious in the middle part of May. A number of available insecticides were tested against the young larvae. Eesults showed that 25% DDT emulsion and 50% wettable DDT ( : 200-400) are more effective.

油松球果小卷蛾是松类的球果及嫩梢的重要害虫之一。该虫在陕西省乔山、黄龙、秦岭,巴山等林区均有分布,已知寄主植物有油松、马尾松、华山松及白皮松等。其中以油松受害最为严重,被害的当年生球果提早枯落而不能成熟;先年生球果多干缩枯死,无子粒:当年生嫩梢常枯枝秃顶,继而干形弯曲,不能长成通直良材,这样,既严重影响森林更新及造林用种,又严重威胁树木生长发育及木材利用价值。 该虫在陕西省乔山林区年只一代,以蛹越夏过冬。翌年4月中旬为蛾始发期,4月下旬至5月上旬达盛发期。蛾盛飞时刻在傍晚19时30分至20时30分。卵散产,主要产于先年生球果上,间或产于嫩梢及针叶上。卵期14天。幼虫始孵期在5月上旬,中旬达盛孵期,6月上、中旬幼虫始老熟,吐丝下地在枯枝落叶层及杂草丛下结茧化蛹,准备越夏过冬。 该虫发生在海拔1,900米以下的松林内,而在1,900米以上的高寒山地尚未见其踪迹。其发生为害规律是:低海拔重于高海拔,山下部重于山中、上部,纯林重于混交林,疏林重于密林,幼、中龄林重于近、成、过熟林,结实好林分重于结实不好及未结实林分。该虫的发生期是阳坡先于阴坡,低海拔先于高海拔,并与植物物候相关,如幼虫孵化始、盛期,正是油松开花始、盛...

油松球果小卷蛾是松类的球果及嫩梢的重要害虫之一。该虫在陕西省乔山、黄龙、秦岭,巴山等林区均有分布,已知寄主植物有油松、马尾松、华山松及白皮松等。其中以油松受害最为严重,被害的当年生球果提早枯落而不能成熟;先年生球果多干缩枯死,无子粒:当年生嫩梢常枯枝秃顶,继而干形弯曲,不能长成通直良材,这样,既严重影响森林更新及造林用种,又严重威胁树木生长发育及木材利用价值。 该虫在陕西省乔山林区年只一代,以蛹越夏过冬。翌年4月中旬为蛾始发期,4月下旬至5月上旬达盛发期。蛾盛飞时刻在傍晚19时30分至20时30分。卵散产,主要产于先年生球果上,间或产于嫩梢及针叶上。卵期14天。幼虫始孵期在5月上旬,中旬达盛孵期,6月上、中旬幼虫始老熟,吐丝下地在枯枝落叶层及杂草丛下结茧化蛹,准备越夏过冬。 该虫发生在海拔1,900米以下的松林内,而在1,900米以上的高寒山地尚未见其踪迹。其发生为害规律是:低海拔重于高海拔,山下部重于山中、上部,纯林重于混交林,疏林重于密林,幼、中龄林重于近、成、过熟林,结实好林分重于结实不好及未结实林分。该虫的发生期是阳坡先于阴坡,低海拔先于高海拔,并与植物物候相关,如幼虫孵化始、盛期,正是油松开花始、盛期,也是进行化学防治的大好时机。 防治措施:营造混交林;改疏

 
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