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自然分布区
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  natural range
     Study on Phenotypic Variation in Natural Range of Longpeduncled alder ( Alnus cremastogyne )
     桤木自然分布区内表型变异的研究
短句来源
     Z. Xanthoxylum is a strong drought tolerant shrub; the annual rainfall of its natural range is between 50 and 200mm.
     霸王是一种强旱生型小灌木,其自然分布区年降水量一般在50-200mm左右,300mm以上降水量很难见到霸王天然分布群落。
短句来源
     Significantly higher heterozygosity of the Pgi was detected in the southernmost location of the natural range of the American chestnut.
     在美洲栗自然分布区中 ,南端地区的居群存在显著高的 Pgi遗传杂合度。
短句来源
     Field investigation on natural range of Styrax tonkinen sis showed that the species is a kind of associate type which often grows in thin stocked land or forest edge exposed to the sun with warm and moist weather,loose,ferile and weak acid soil,thick soil horizon and good drainage conditions.
     由东京野茉莉吉水自然分布区野外调查表明:它喜生长于气候温暖、较潮湿、土壤疏松而肥沃、土层深厚、微酸性、排水良好的阳坡或半阳坡的疏林或林缘,是伴生树种。
短句来源
  natural distribution
     At last, recommended for seedling height, 10 superior provenances were selected respectively for two experimental locations and these provenances almost came from the natural distribution area about at latitude 25° N.
     以苗高为标准,分别在两地点初选出优良种源10个,它们多来自25°N左右的木荷自然分布区
短句来源
     This paper discusses the distribution patterns of Tamarix L. in China, and analyzes the ecological features of the natural distribution areas and of the domesticating areas as well as the ecological adaptability of Tamarix L. It is considered that there is a possibility to domesticate the most species of the genus in the arid and semi-arid irrigated areas located in the region of 30~50°N, 75~130°E in China.
     介绍了中国柽柳属植物的分布格局 ,分析了自然分布区和引种区的生态特点 ,阐述了柽柳属植物的生态适应性。 认为本属多数植物在中国 30°~ 5 0°N ,75°~ 130°E范围的干旱、半干旱荒漠区都有引种和发展的可能性。
短句来源
     In the natural distribution area of Qiongzhuea tumidinoda in Northeast Yunnan, the long-term comprehensive effects by the interference body in specific district makes the phenomenon of degradation of the clonal population of Qiongzhuea tumidinoda universal.
     在滇东北筇竹自然分布区,长期受特定区域干扰体的综合影响,筇竹无性系种群的退化是普遍存在的。 对山地湿性常绿阔叶林的乱砍滥伐导致筇竹生长的生态环境的丧失而间接引起筇竹无性系种群的退化:掠夺式采笋则是通过频繁地破坏筇竹无性系正常生长发育规律,而加剧筇竹无性系种群的退化。
短句来源
     In view of its diversity in distribution area and growth habits, as well as its abundant variation and genetic diversity, systematic studies on different levels have been made on the ecological characters, population variation, comparative anatomy and AFLP molecular marker of 19 wild populations and 1 cultivated population of Zoysia japonica from its natural distribution area in China. Based on that, Zoysia japonica germplasm base in China has been set up.
     鉴于结缕草在分布范围和生长习性上的多样性、具有的丰富变异和遗传多样性,本研究对我国结缕草种质资源自然分布区19个具有代表性居群和1个栽培居群进行了生态学特性和居群变异、比较解剖学和AFLP分子标记几个不同水平的系统研究,并建立了我国结缕草种质资源基地。
短句来源
     On the basis of species areographic theory of floristics, the paper expounds the adaptive and systematic evolutionary significance of the species natural distribution and the relation between the systematic evolation and the introduction and domestication of plants.
     本文以植物区系学的种系分布区理论为依据,阐述了植物种系自然分布区的适应意义、系统演化及其与引种驯化的关系。
短句来源
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  natural distribution area
     At last, recommended for seedling height, 10 superior provenances were selected respectively for two experimental locations and these provenances almost came from the natural distribution area about at latitude 25° N.
     以苗高为标准,分别在两地点初选出优良种源10个,它们多来自25°N左右的木荷自然分布区
短句来源
     In the natural distribution area of Qiongzhuea tumidinoda in Northeast Yunnan, the long-term comprehensive effects by the interference body in specific district makes the phenomenon of degradation of the clonal population of Qiongzhuea tumidinoda universal.
     在滇东北筇竹自然分布区,长期受特定区域干扰体的综合影响,筇竹无性系种群的退化是普遍存在的。 对山地湿性常绿阔叶林的乱砍滥伐导致筇竹生长的生态环境的丧失而间接引起筇竹无性系种群的退化:掠夺式采笋则是通过频繁地破坏筇竹无性系正常生长发育规律,而加剧筇竹无性系种群的退化。
短句来源
     In view of its diversity in distribution area and growth habits, as well as its abundant variation and genetic diversity, systematic studies on different levels have been made on the ecological characters, population variation, comparative anatomy and AFLP molecular marker of 19 wild populations and 1 cultivated population of Zoysia japonica from its natural distribution area in China. Based on that, Zoysia japonica germplasm base in China has been set up.
     鉴于结缕草在分布范围和生长习性上的多样性、具有的丰富变异和遗传多样性,本研究对我国结缕草种质资源自然分布区19个具有代表性居群和1个栽培居群进行了生态学特性和居群变异、比较解剖学和AFLP分子标记几个不同水平的系统研究,并建立了我国结缕草种质资源基地。
短句来源
     In the natural distribution area of Pinus koraiensis, the height growth of ten-year-old filial generations for 3 subareas, 9 sites and 108 plus trees was dertermined.
     在红松自然分布区内对 3个亚区、9个地点、10 8株优树的子代 10年生幼树测定结果表明 ,高生长可作为优树表型遗传选择。
短句来源
     Provenances from the southern have higher genetic diversities, compared withthe northern provenances. The natural distribution area about at latitude 25°N shouldcould be the central distribution zones of S. superba.
     种源遗传多样性与其产地纬度呈显著的负相关,南部种源的遗传多样性显著高于北部种源,推测北纬 25°N 左右的自然分布区应是木荷的分布中心。
短句来源
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  “自然分布区”译为未确定词的双语例句
     (3)the maximum of seeds vigor was(39.5%) and its average percentage was only up to(34.6%),the germinstion percentage of seeds in laboratory was low,the average of which was only(32.67%),it was diffcult to sprout if the seed was in natural condition;
     (3)巨柏种子活力最高只有39.8%,平均只达到34.6%,室内条件下,种子发芽率较低,平均只达到32.67%,巨柏在自然分布区的条件下,种子萌发困难;
短句来源
     5. The genetic diversity of individuals from 12 natural populations of M.amoena from different distribution regions was analyzed by using random amplified polymorphic DNA(RAPD).
     5.用RAPD技术,对天目木兰自然分布区安徽、浙江、江苏等地的12个自然种群的个体遗传多样性进行了分析。
短句来源
     The ecological traits,ecological environment types and population variation of 20 Zoysia japonica populations distributed in China were studied. The results showed that: the Zoysia japonica is distributed at altitude from 5m to 385m and the pH of soil is from 6.5 to 8.3. 60% of the soil collected is slight alkalescent.
     对我国结缕草种质资源典型自然分布区19个野生居群和1个栽培居群进行了生态学特性、生境类型和居群变异的研究,结果表明:结缕草主要分布在海拔5~385m之间,土壤pH范围6.5~8.3,其中60%为微碱性。
短句来源
     (4)the nursery stock grew well in the condition that temperature was 23℃ and relative humidity was about 60%,but it didn't grow well in natural environment conditions;
     (4)巨柏苗木适合在23℃、相对湿度60%左右的条件下生长,巨柏自然分布区的条件不利于苗木生长;
短句来源
     To analyze its geographical variance, climate ecological base, and interaction with trial site, the stability of provenances, the character of seeds, growth and physiology of 20 provenances of Fraxinus mandshurica was tested.
     本文以水曲柳(Fraxinus mandshurica)自然分布区内20个种源的生长、种子、生理等性状为研究对象,利用方差分析、相关分析、回归分析等多种统计分析方法,研究了水曲柳(Fraxinus mandshurica)的地理变异及其趋势; 探讨了地理变异的气候生态基础;
短句来源
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  natural range
The origin of the chosen accessions overlapped with the natural range of duckweeds in Russia.
      
Male lizards were presented with five digital video stimuli, each depicting the same male conspecific, but with inter-bout intervals that varied over the full natural range.
      
cainii in the Hutt River was relatively low compared with that recorded from within its natural range.
      
The distribution and diversity of Pratylenchus species associated with Ammophila arenaria was investigated in its natural range of distribution.
      
bainsii and suggests positive conservation steps which should be implemented within the natural range of this species
      
更多          
  natural distribution
A comparison of the experimental results with the character of the natural distribution of isomorphic impurities in quartz revealed their similarity.
      
Timing of diapause induction outside the natural distribution range of a species: an outdoor experiment with the bean bug Riptor
      
The results are as follows: (1) The species so called asPinus koraiensis found in northwest of Daxing'anling Mountain isPinus Sibirica indeed; There are no natural distribution ofPinus Koraiensis in Daxing'anling Mountain.
      
This introduction includes natural distribution and collection, conservation, gene diversity, provenance trial, crossing breeding, vegetative propagation and disease resistant etc.
      
This paper briefly reviews the studies on natural distribution, biological character, ecological character, chemical component, hazard, potential application and the control ofE.
      
更多          
  natural distribution area
On the eastern slope of the Andes Mountains (Argentina) it has a very small and narrow natural distribution area which follows the valleys of the numerous west-east lake basins.
      
The analysis of 92 trees covering the whole natural distribution area of the species allowed detection of 11 length variants ranging from 131?bp to 447?bp.
      
cv Sativum, coincides with the natural distribution area of its wild relative, C.
      


This paper deals with the phytosociological characters of the Wumon-fir

本文述及云南乌蒙山脉残留分布的急尖长苞冷杉林(即乌蒙冷杉林)的植物群落学特征。此类森林目前只有小面积分布于乌蒙山的海拔3100-3900米处。它是滇中高原北部山地唯一的亚高山针叶林,也是该地植被垂直带谱中的一个重要组成。群落由急尖长苞冷杉组成的单优势林,偶见云南铁杉混生。下木有花楸、榛、荚蒾、柳、树五加、绣球、冬青、杜鹃等属的种类组成。灌木层以箭竹为主,而草本层种类较多。大部分种类为中国-喜马拉雅区系成分。急尖长苞冷杉林的植物群落学特征与滇西北-带的亚高山针叶林非常近似,但乔木层缺乏云杉属和落叶松属的种类。可以认为,此类冷杉林是滇西北、川西南和藏东南这一个亚高山针叶林植被分布区的一个最为东南的边缘类型,它的分布已到了分布区的极限。它是自然历史的残留林,又在人为影响下,面积越来越小。对于此类残留森林,必须严加保护,使其得以发展以扩大自然分布区。如果这样,这对于改变乌蒙山脉的农、林、牧诸方面的面貌,将起着十分积极的作用。

In accordance with the species indentification,and the determination ofthe physical and chemical properties and ages as well as the on-the-spotexamination,it was found that the so called buried wood(jianchang board),aprecious wood of Cunninghamia unicanaliculata Wang et Liu was buried underthe ground for many years because of local earth crust changed.In theground it had undergone changes in its chemical composition and thereforepossessed a high resistance to rot. It is suggested that Dechang county area is...

In accordance with the species indentification,and the determination ofthe physical and chemical properties and ages as well as the on-the-spotexamination,it was found that the so called buried wood(jianchang board),aprecious wood of Cunninghamia unicanaliculata Wang et Liu was buried underthe ground for many years because of local earth crust changed.In theground it had undergone changes in its chemical composition and thereforepossessed a high resistance to rot. It is suggested that Dechang county area is the ancient natural distribu-tion region of the species.

本文根据对建昌阴沉木的树种鉴定和理化性能的分析,距今树龄的测定,以及产地的调查,确定了建昌阴沉木是德昌杉木因地壳局部变动埋入地下百年以后而形成的一种具有强耐腐力的名贵木材;同时,提出了德昌一带是德昌杉木的古老自然分布区

The lac insect, Laccifer lacca (Kerr) Targ., is one of the most valuable beneficial insects of China which occurs in Yunnan, Taiwan and Tibet. This paper deals with the result of biological studies carried out in Yunnan from 1955 to 1963. It may be summaried as follows.1.In the regions of its endemic distribution in Yunnan, lac insect occurs two generations a year. Jingdong is the northern boundary of its distribution and the two generations occurred in May-June and October-November respectively, while at southern...

The lac insect, Laccifer lacca (Kerr) Targ., is one of the most valuable beneficial insects of China which occurs in Yunnan, Taiwan and Tibet. This paper deals with the result of biological studies carried out in Yunnan from 1955 to 1963. It may be summaried as follows.1.In the regions of its endemic distribution in Yunnan, lac insect occurs two generations a year. Jingdong is the northern boundary of its distribution and the two generations occurred in May-June and October-November respectively, while at southern regions it would breed earlier.2.The duration of developmental stages of different generation is influenced by the local climate and the condition of host plant. However, the life cycle of this insect in various regions of Yunnan seems consistent in time if it has long been adapted to the climatic changes of these regions as well as to the ecophysiological characteristics of the host plants.3. The larvae have regular habit of swarming. The abundance of swarming larvae, the critical moment and duration of swarming are obviously influenced by the climatic condition, the "ripeness" in development of the insect and the seasonal generation.4.The dispersing capacity of larvae is rather limited, only a distance about 5 metres can be attained by the newly hatched larvae in their cruising. After settling the larvae are unable to move again. The unsettled larvae can live only for 4-6 days in the first generation (summer generation) and for 6-8 days in the second generation (overwintering generation). Therefore, in order to increase lac production, artificial inoculation and care of brood-lac is quite neccessary.5.The larvae display the behavior of crowding and host selection in colonization. They prefer 2-3 years old shoots located in the high position or in the middle of the crown of dominant host plants to settle, where the temperature, light, ventilation and bark surface are suitable. On the whole, the enviromental condition as described above would provide ideal habitat for the young larvae of this insect to settle and develop. Accordingly, in addition to the selection of good host plants, prunning and care in management, we should pay also attention to host plant nursing.6.The lac insect would secret lac, wax and honey dew during its development. They are not only the signals of life process of the insect but also the qualitative criteria of the living condition. In general, the quantity of lac, wax and honey dew secretion indicates whether growth and development are carried out in optimal condition. 7.The amount of lac secretion is greater in the first generation than in the second generation, the total amount of lac secreted by a single female larva on Eriolaena spectabi-lis (DC.) Planchon ex Mast at Jingdong during the first generation is estimated to be 0.54 mg in average and in the second generation 0.28 mg, and the total amount of lac secreted by a single female adult ranges from 16.3 to 25.7 mg in the first generation and from 7.4 to 10.4 mg in the second generation.8.The reproductive potential of lac insect is relatively high, and a female of the first generation lays 224-307 eggs while that of the second generation 160-240 eggs.9.The sex ratio of lac insect is variable in different generations. Generally, females are predominant in both generations, 75-80% in the first generation and 50-78% in the second generation.10.Tn irs endemic regions in Yunnan the lac insect has larger amount of iac secretion and higher reproductive potential as well as more females in sex ratio in the summer generation than in the overwinter generation, Therefore, it will be very beneficial to adopt the experience on lac production from the masses, cultivate and harvest lac twice annually, and to lay more stress upon the summer generation (cutivation in summer and collection in autumn).

紫胶虫Laccifer lacca(Kerr)Targ.在云南自然分布区一年发生两代,各世代有涌散、固定、泌胶、泌蜡和排泄蜜露等活动。由于幼虫在饥饿状态下的存活期较短,迁移能力较差,必须及时实行人工放养和科学管理,才能获得紫胶高产。本文报道了紫胶虫各世代的泌胶量、生殖力和性比,并提出发展紫胶生产的建议。

 
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