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niche
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  生态位
    The Niche Analysis of Wheat Ear Aphids and Their Natural Enemies
    小麦穗蚜及其天敌的空间生态位分析
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    Studies on the Niche Patterns of Rape Aphid Population and Their Natural Enemies
    油菜蚜虫种群及天敌生态位格局研究
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    Niche Study and Competition Guild Division of Main Insect Pests in Gourd Vegetables
    瓜类主要害虫生态位研究及竞争群划分
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    The Niche and Timedynamic Analysis of Insect Community in Citrus Orchard of South Gansu
    陇南桔园昆虫群落生态位及时序动态研究
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    Study on the niche of Beckmannia syzigachne (Steud.) Fernald
    草(Beckmannia syzigachne(Steud.) Fernald)生态位的研究
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  “niche”译为未确定词的双语例句
    Temporal and spatial niche dynamics of spiders and their control effects on cotton bollworms in transgenic Bt cotton fields
    转Bt基因棉田蜘蛛的时空动态及控害作用
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    TEMPORAL AND SPATIAL NICHE DYNAMICS IN DIURNAL CYCLE OF BEMISIA TABACI ADULT AND ITS SPATIAL PATTERN
    烟粉虱成虫的昼夜时空动态及空间格局
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    Among the 22 weeds,the hish niche overlaps occurred among Avena fatua,Galium aparine var.tenerum,Veronica persica,Cerastium viscosum,Artemisia argyi and Capsella bursapastoris,while the niche overlaps between Alopecurus aequalis,Polygonum persica,Stellaria alsine,Malachium aquaticum,Veronica undulata,Polypogon fugax and Lapsana apogonoides were higher,too.
    22种杂草中,野燕麦与猪殃殃、波斯婆婆纳、卷耳、艾蒿(Artemisiaargyi)、荠菜(Capselabursa-pastoris)?
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    The number of the major nisect pests and their predators in soybean fields were investigated in southwest cotton areas of Shandong Province, China in 1997.Based on the investigated results, the niche breadth of species and the niche overlap indices among the species were studied.
    1997年调查了鲁西南棉区豆田不同时期内,大豆植株上、中、下3部位上主要害虫及其捕食性天敌的数量。
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    The results showed:(1)No obvious changes of POD isozymograms were found in Erigeron annuus,Conyza canadensis and Aster sublatus when temperature changed,Conyza bonarinsis could adapt itself to the changes of temperature by the addition of its POD isozymic bands,these four exotic weeds had broader niche of temperature;
    结果表明 ,温度变化对一年蓬、小飞蓬、钻形紫菀过氧化物酶同工酶谱的影响相对较小 ,野塘蒿通过增加酶带、调整同工酶的组成来适应温度的变化 ,反映出这 4种杂草对温度变化具有较强的适应能力 ;
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  niche
Root Ecological Niche Index and Root Distribution Characteristics of Artificial Phytocommunities in Rehabilitated Fields
      
The ecological niche that roots occupy, their abundance and distribution, and the factors that affect them must be acknowledged.
      
In the first instance therefore, a new method to calculate the root ecological niche index (RENI) is proposed, embracing the entire phytocommunity of plantations.
      
Niche of insect borers within Pinus massoniana infected by pine wood nematode
      
The niche width, proportional similarity of niche and the niche overlap of dominant species of dying trees were computed.
      
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The symptom of the root rot of Korean pine is that, in the earlier stage the crown becomes yellow-green, thinned, and the needles slenderized, and later on, the whole crown turns blight yellow,the stump appears resin flow, swollen and rot. The root collar and root of trees produce fan-shaped, veined,white mycelial felts between bark aud wood. There are a lot of rhizomorphs inside and outside the root. The sapwood becomes spongy rot,when the trees are severely injured. From August to October the sporephores occur...

The symptom of the root rot of Korean pine is that, in the earlier stage the crown becomes yellow-green, thinned, and the needles slenderized, and later on, the whole crown turns blight yellow,the stump appears resin flow, swollen and rot. The root collar and root of trees produce fan-shaped, veined,white mycelial felts between bark aud wood. There are a lot of rhizomorphs inside and outside the root. The sapwood becomes spongy rot,when the trees are severely injured. From August to October the sporephores occur on stump, snag and seriously infect trees. The development oF disease on the south-western slopes is more serious than on the north-eastern, and so it is on the middle and the lower part of the mountain than on the upper part, too. Trees on low niches and moist land are subjected to the disease severely.Pathogenic fungi are obtained from the isolated culture of the sick root. Its colony and funiculus grow well on wort agar medium. At the end, the sporecarps occur in the bottle. Sporecarps are produced in abundance on the westage-wheat skin-urea medium. They seem honey yellow, caespitose and annulate. There are brown scales on the cap. Their spore print is white with light yellow, the gills a-e adnoto-decurrent,spore 6.5-9.9×4.3-6.8 micron, this pathogenic fungus is identified as shoestring fungus [Armillariella mellea (Vahl. et Fr.) Katrst]. The basidiospore from carpophore can infect Stub and weak wounded trees.The rhizomorphs grow actively and extend in the soil, and infect healthy plants.The bavistin has the better fungistatic action in the experiment of chemotherapy. The bavistin mixed with humuic acid-ammoniate, and lime,zineb,thiophanate and dry limes-sulphur give certain result.

红松根朽病的症状是初期冠希、色淡、针叶变细,后期全冠枯黄、干基肿大、流脂、溃烂,形成层有白色扇形菌膜,根部内外有大量菌素。树木严重受害时木质部边材呈海绵状腐朽。在伐根、枯死木及重病衰弱木上,8~10月可产生子实体。病害的发生阳坡重于阴坡,山中、下腹重于上腹。低凹潮湿的林地病重。由病根分离培养获得病原菌,其菌落、菌索在麦芽培养基上生长良好,后期在三角瓶内产生典型子实体,在木屑麦麸脲素培养基上产生大量子实体。子实体蜜黄色、丛生、具菌环,菌盖上有褐色鳞片,孢子印黄白色,菌褶贴生、延生,孢子6.5~9.6×4.3~6.8微米,经鉴定为蜜环菌[Armilla-riella mellea(Vahl.ex Fr.)Karst.]子实体上产生的担孢子侵染伐根和带伤的衰弱木,菌索在地下伸延侵染健康植株。药剂防治试验,多菌灵抑菌效果较好,多菌灵加腐植酸铵、熟石灰、代森锌、托布津、熟石灰加硫黄粉也有一定效果。

The effects of egg densities of Dendrolimus punctatus Walker on the parasitizing efficiency of its three important egg parasitoids—Trichogramma dendrolimi Matsumura, Telenomus dendrolimusi Chu and Ansatatus albitarsis Ashmead——and the interactions of these parasitoids on egg clusters were studied through laboratory and field trials and field sampling. It was found that T. deudrolimi and T. dendrolimusi had relevantly more egg clusters discovered as the number of egg clusters per niche unit (here referred...

The effects of egg densities of Dendrolimus punctatus Walker on the parasitizing efficiency of its three important egg parasitoids—Trichogramma dendrolimi Matsumura, Telenomus dendrolimusi Chu and Ansatatus albitarsis Ashmead——and the interactions of these parasitoids on egg clusters were studied through laboratory and field trials and field sampling. It was found that T. deudrolimi and T. dendrolimusi had relevantly more egg clusters discovered as the number of egg clusters per niche unit (here referred to as the individual tree )increased. However, this kind of responses was not apparent for A. albitarsis. It was also found that as the number of eggs per egg cluster increased, the discovering rates of egg clusters and the number of parasitized eggs of discovered egg clusters of the three parasitoids increased, but the percent parasitisms decreased. The number of eggs per cluster fixed, A. albitarsis parasitized more eggs than the other two parasitoids. When searching for host egg clusters, T. dendrolimi and T. dendrolimisi tend to avoid each other, While T dendrolimi and A, albitarsis tend to attract each other.

通过室内和田间试验及抽样调查,初步探讨了马尾松毛虫卵密度对其三种主要寄生蜂——松毛虫赤眼蜂、松毛虫黑卵蜂和白跗平腹小蜂的寄生效率的影响以及各寄生蜂在卵块单位上的相互作用.研究发现,随着生境单位(这里为单株树)卵块数的增加,松毛虫赤眼蜂和松毛虫黑卵蜂的发现卵块数相应增加,但白跗平腹小蜂的这一反应不明显;随着卵块的增大,各蜂的卵块发现率和发现卵块寄生卵粒数亦相应增加,但发现卵块寄生率呈相反趋势;在卵块大小相同的情况下,白跗平腹小蜂的寄生卵数大于其它两蜂;在搜寻寄主卵块时,松毛虫赤眼蜂和松毛虫黑卵蜂有相互离异的趋势,而松毛虫赤眼蜂和白跗平腹小蜂有相互吸引的趋势。

Five species of Stethorus in Sichuan province were found and their distribution was investigated. The dominant ones are Stethorus chengi Sasaji, S. punctillum Weise and S. yunnanensis Pang et Mao. They over- winter mainly in adult stage in curved citrus leaves and in litters on the ground. The Stethorus spp. changed their habitat plants in a year or changed the pick time of their prey on different plants. In citrus orchard, the spatial ecological niches of Stethorus spp. greatly overlap that of their prey...

Five species of Stethorus in Sichuan province were found and their distribution was investigated. The dominant ones are Stethorus chengi Sasaji, S. punctillum Weise and S. yunnanensis Pang et Mao. They over- winter mainly in adult stage in curved citrus leaves and in litters on the ground. The Stethorus spp. changed their habitat plants in a year or changed the pick time of their prey on different plants. In citrus orchard, the spatial ecological niches of Stethorus spp. greatly overlap that of their prey (Panonychus citri Mcgregor), the overlap of time niches, however, was much smaller.

本文报道了5种食螨瓢虫在四川的分布。其中,束管食螨瓢虫、深点食螨瓢虫、云南食螨瓢虫为优势种。食螨瓢虫以成虫在树上卷叶及地表枯枝落叶内越冬,随着不同寄主植物上叶螨高峰期不同,食螨瓢虫存在栖息作物转移现象。在桔园内,食螨瓢虫与桔全爪螨的空间生态位重叠大,而时间生态位重叠小。

 
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