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乡土种
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  native species
    Based on the concept of alien species, native species, alien species invasion and its harm, the positive and negative influence of alien species and population amplification on diversity of species are expatiated systematically.
    在综述外来种、乡土种和外来种入侵的基本概念及其危害情况的基础上,系统阐述了外来种侵入和种群扩大对生物多样性所带来的正负两方面的影响。
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  “乡土种”译为未确定词的双语例句
    Among them, 451 species were Beijing native plants, which were accounted for 71.36% of total plants species; 99 species were introduced from other regions of China, 15.66% of total parks plants, and 73 species were introduced from foreign countries, 11.55% of total plants.
    其中北京本地种451种,占总数的71.36%,国内引进种99种,占总数的15.66%,国外引进种73种,占总数的11.55%,表现出北京城市建成区植物以乡土种为主体,引进种也较为丰富的特征。
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  native species
They are generalist predators and thus may affect native species through predation.
      
While some facilities maintain both exotic and native species, most (68%) house native species only.
      
The arid climate of the islands may hinder the establishment of invasive species, which are often not able to survive in the bush and thus reduces their impact on native species.
      
The first group comprises 35 native species, of which seven are currently extinct or vanished.
      
rusticus compared to native species, resulting in increased probability of shifts in crayfish community composition.
      
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Huangjia Lake and Qingling Lake are two small-sized lakes,located on the south bank of Changjiang (Yangtze)River.The two lakes are about two kilometres apart and 13 kilometres from Wuhan City. The area of Huangjia Lake is 6.9 km2and 1.2m on average in depth in August. Qingling Lake is 9. 7 km2 in area and 1.7 m in depth.Huangjia Lake has a long history of fishculture. With the development of fishery exploitation,the environment of the lake is destroyed seriously and most of the aquatic plants disappeared.Qingling...

Huangjia Lake and Qingling Lake are two small-sized lakes,located on the south bank of Changjiang (Yangtze)River.The two lakes are about two kilometres apart and 13 kilometres from Wuhan City. The area of Huangjia Lake is 6.9 km2and 1.2m on average in depth in August. Qingling Lake is 9. 7 km2 in area and 1.7 m in depth.Huangjia Lake has a long history of fishculture. With the development of fishery exploitation,the environment of the lake is destroyed seriously and most of the aquatic plants disappeared.Qingling Lake is separated into two parts and one is used for breeding fish and the other is not interfered.Within the part of Qingling Lake under normal conditions,the majority of plants distributed in the outside of the palisade which is about three fifth of the total are a of the lake.Moreover, only 10 species existed within the palisade because fishculture is intensified in recent years. The plants living outside the palisade are more than those of inside,especially the species of the genus Trapa which are rare in the Huangjia Lake. In addition, Ottelia alismoides,also distributed outside the Qingling Lake and scatterad from the Yun-Gui plateau to Sanjiang Plain, but it has become a rare species in the lakes of the Changjiang River basin.This paper tries to find out the factors affecting the growth and distribution of aquatic plants.The relationship between the species richness and the structure of community,and the reasons for the aquatic plants disappearance from the lakes.In order to reach these purposes,some corresponding researches have been carried out in the Huangjia Lake and Qingling Lake.The results obtained from the experiments show clearly that the fishery exploitation is the main limiting factor which affect the life of the plants.The species richness is closely related to the structure of the communities.

讨论了渔业利用对武汉市两个近郊湖泊的不同影响,养鱼历时10a的黄家湖中水生植物种类数量锐减,鱼喜食的一些植物种类已灭绝。青菱湖渔业利用强度低,仅在东半部进行2a鱼类粗养试验,故水生植物生长受到较少影响,1994年停放鱼苗后,东半部水生植被得以恢复,许多乡土种重新在湖区中出现。对青菱湖与黄家湖水生植物区系组成、群落结构、物种丰富度与均匀度、群落分类与生物量及植被分布等进行了对比分析。青菱湖现有水生植物52种,包括一些稀有种和对环境变化敏感的易危种;群落结构较复杂,数量特征值和生产量较高。相反,黄家湖仅有29种植物,且多为广布种;群落结构简单,数量特征值和生产量较低。从植物丰富度比较青菱湖的值明显偏高。造成两湖水生植物多样性变化较大的主要原因是人为干扰。

To provide materials for the selection of plant species for vegetation restoration and re-construction in the farming-pastoral zone in northern China, where the eco-environment has been al-ready deteriorated by over-farming and over-grazing, the suitable trees, shrubs and herbages were examined,screened and identified under the guidance of four principles of taking precedence for ecologicalconservation, being beneficial to economic production, matching species (trees, shrubs and herbages)with the site, and giving...

To provide materials for the selection of plant species for vegetation restoration and re-construction in the farming-pastoral zone in northern China, where the eco-environment has been al-ready deteriorated by over-farming and over-grazing, the suitable trees, shrubs and herbages were examined,screened and identified under the guidance of four principles of taking precedence for ecologicalconservation, being beneficial to economic production, matching species (trees, shrubs and herbages)with the site, and giving consideration to the integrity of local administrative division. According to the keyecological factors that determine species growth and distribution in the zone, i.e., the lowest daily meantemperature in a year, annual accumulated temperature, and water regimes represented by the moistindex, the ratio between annual rainfall and accumulated temperature (>0 ℃), as well as the soil typeinfluenced by climate, surface substances and landform, the farming-pastoral zone was regionalized intoseven parts: (Ⅰ) Western Songliao Plain and Da Hinggan Mountain Region; (Ⅱ) Upper Liaohe River SandyRegion; (Ⅲ) Mid-Eastern Nei Mongol Plateau and Northwestern Heibei Mountain Region; (Ⅳ) Luliang,Taihang and Yanshan Mountain Region; (Ⅴ) Ordos Plateau Sandy Region; (Ⅵ) Northern Shaanxi toEastern Gansu Loess Plateau Region; and (Ⅶ) Mid Gansu to Eastern Qinghai Plateau Loess Region. Andthe suitable trees, shrubs and herbages for each region were selected and tabularly introduced in detail.

因遭受滥垦及过度放牧破坏的中国北方农牧交错带亟待进行植被的恢复和重建。本文从为该区域植被的恢复与重建提供植物物种上的支持出发,对适宜该区域生长与分布的乔、灌、草种进行了生态区划。生态区划的原则概括为4条:生态保育优先、有利生产发展、适地适树适草以及参考行政区划边界。在该原则指导下,依据限定农牧交错带植物生长和分布的主要生态因子:年最低日均温、年大于0 ℃积温、湿润度指数(年降水量与年大于0 ℃积温之比)、反映区域地表组成物质、地形及气候特征影响的土壤类型等,将农牧交错带划分为7个不同的生态区域,依次为:Ⅰ. 松辽平原西部及大兴安岭山地区, Ⅱ. 辽河上游风沙区, Ⅲ. 蒙古高原中、东部及冀西北山地区, Ⅳ. 吕梁山、太行山、燕山山地区, Ⅴ. 鄂尔多斯高原风沙区, Ⅵ.陕北、陇东黄土高原区, Ⅶ. 陇中及青海高原东部黄土区。在上述分区的基础上,对以往文献报道中出现的适宜该区域生长和分布的乔、灌、草,包括乡土种和人工栽培或引种的外来种,按其生态习性分别进行了细致的甄别选择,并在文中择其精要予以列出。

Caragana Fabr. is an important composition of vegetation in Northwest China and potential plant resources for rehabilitation of degraded ecosystem in the Loess Plateau. The effect of temperature on germination of two indigenous and one exotic species was studied under controlled conditions in laboratory. Treatments included six constant temperature regimes, 5 ℃,10 ℃,15 ℃, 20 ℃,25 ℃,30 ℃ and four alternating day/night temperature regimes, 10 ℃/5 ℃,25 ℃/15 ℃,30 ℃/20 ℃,35 ℃/20℃. C. intermedia had wide temperatures...

Caragana Fabr. is an important composition of vegetation in Northwest China and potential plant resources for rehabilitation of degraded ecosystem in the Loess Plateau. The effect of temperature on germination of two indigenous and one exotic species was studied under controlled conditions in laboratory. Treatments included six constant temperature regimes, 5 ℃,10 ℃,15 ℃, 20 ℃,25 ℃,30 ℃ and four alternating day/night temperature regimes, 10 ℃/5 ℃,25 ℃/15 ℃,30 ℃/20 ℃,35 ℃/20℃. C. intermedia had wide temperatures range for germination and quick germination velocity. Seed germination percentage was high at 10~30 ℃ for C. intermedia even higher 78.5%±1.3 at 5 ℃ for C. opulens and was low at all temperature regimes for C. licentiana. Germination was inhibited at 30 ℃ for C. opulens and at 5 ℃ for C.licentiana . Effect of alternating day/night temperature on germination of the three species is not significant. The average incubation period needed for germinating of C. licentiana was longer than that of others. Few seeds of C. licentiana germinated each day. Some hard coat seed existed in this subfamily. There were 5.1% hard coat seeds for C. licentiana and 0.8% for C. intermedia . But C. opulens had no hard coat seed. Germination responses to temperature in the three species are related to their ecological distribution and habitat. The different germination patterns in the species imply different germination strategies. Fig 2, Tab 1, Ref 17

锦鸡儿属 (CaraganaFabr.)植物是黄土高原植被的重要组分 ,对维持生态系统的功能具有重要作用 ,在黄土高原的植被恢复中具有重要意义 .外来种中间锦鸡儿 (C .intermediaKuangetH .C .Fu)和乡土种白毛锦鸡儿 (C .li centianaHand -Mazz)、甘蒙锦鸡儿 (CaraganaopulensKom .)种子在室内 5℃、10℃、15℃、2 0℃、2 5℃、30℃恒温及10℃ /5℃、2 5℃ /15℃、30℃ /2 0℃、35℃ /2 0℃昼 (10h) /夜 (14h)的变化温度下培养 .结果表明 ,中间锦鸡儿适于萌发的温度范围最为宽泛 ,为 5℃到 30℃ ,萌发率普遍较高 .甘蒙锦鸡儿适于萌发的温度在 30℃以下 ,萌发率很高 ,大部分为 10 0 % ,5℃下仍有较高的萌发率 .而白毛锦鸡儿适于萌发的温度范围相对较窄 ,萌发率普遍较低 ,5℃时种子不萌发 .昼 /夜温度变化对 3种锦鸡儿种子萌发的影响不大 .从萌发速度来看 ,中间锦鸡儿倾向于适宜温度范围内在很短时间内很快完成萌发 ,高温下萌发速度更快 ,另有 0 .8%的硬实种子 .白毛锦...

锦鸡儿属 (CaraganaFabr.)植物是黄土高原植被的重要组分 ,对维持生态系统的功能具有重要作用 ,在黄土高原的植被恢复中具有重要意义 .外来种中间锦鸡儿 (C .intermediaKuangetH .C .Fu)和乡土种白毛锦鸡儿 (C .li centianaHand -Mazz)、甘蒙锦鸡儿 (CaraganaopulensKom .)种子在室内 5℃、10℃、15℃、2 0℃、2 5℃、30℃恒温及10℃ /5℃、2 5℃ /15℃、30℃ /2 0℃、35℃ /2 0℃昼 (10h) /夜 (14h)的变化温度下培养 .结果表明 ,中间锦鸡儿适于萌发的温度范围最为宽泛 ,为 5℃到 30℃ ,萌发率普遍较高 .甘蒙锦鸡儿适于萌发的温度在 30℃以下 ,萌发率很高 ,大部分为 10 0 % ,5℃下仍有较高的萌发率 .而白毛锦鸡儿适于萌发的温度范围相对较窄 ,萌发率普遍较低 ,5℃时种子不萌发 .昼 /夜温度变化对 3种锦鸡儿种子萌发的影响不大 .从萌发速度来看 ,中间锦鸡儿倾向于适宜温度范围内在很短时间内很快完成萌发 ,高温下萌发速度更快 ,另有 0 .8%的硬实种子 .白毛锦鸡儿萌发速度最慢 ,呈现每次都有少部分种子萌发的格局 ,另外有 5 .1%的硬实种子进入持久种子库 .而甘蒙锦鸡儿的萌发速度介于二者之间 ,且没有硬实种子 .3种锦鸡儿种子萌发格局与其地带性分布和生境有关 ,萌发格局的不同也揭示了这 3种锦鸡儿在不同

 
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