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     philoxeroides started to grow at lower temperatures, 10.4℃ and 11.0℃, respectively, than A. sessilis which needed 12.8℃ and 14.9℃, respectively, indicating that A. philoxeroides was less sensitive to low temperature than A.
     入侵种主茎和叶的发育起点温度都比本土种低,分别是10.4℃、11.0℃和12.8℃、14.9℃,表明喜旱莲子草的发育对低温反应不及莲子草敏感。
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     The introduction and invasion of alien organisms may cause the genetic pollution of native spices.
     外来生物的引进或入侵会给本土种造成遗传污染。
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     Reflections on Cultural Studies and Cultural Criticism in China (conversation in writing)
     本土大众文化的三态势
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     Two Philosophy Perspectives in Indigenous Psychology
     本土心理学的两哲学视野
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     F.
     新F.
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     1 The variation of perforation plate of vessels in the stemthere are two types of vessels in the secondary stem of E.
     1
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     Native professional managers growup
     本土经理人的天花板
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  indigenous species
This system was used to analyze three major non-indigenous species, Dendroctonus valens, Hyphantria cunea, and Apriona swainsoni.
      
Alien plants, along with their ecological invasion and negative impacts on indigenous species diversity and ecosystems, are one of the major topics of current ecological research.
      
Among the seven indigenous species, six are Holarctic; the distribution of five species is confined to tundra landscapes, and five species are predators.
      
In nature, the non-indigenous species might even reach higher levels of dominance over A.
      
Non-indigenous species were screened in glasshouse tests in the UK.
      
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Ten populations of the whitefly Bemisia tabaci (Gennadius) collected from eight fieed and ornamental crops from seven provinces/cities in China were determined using RAPD PCR. Results showed that the 10 populations of B.tabaci could be classified into three distinct groups: a Biotype B group, a Guangxi group, and a Fujian group. The whiteflies in the Biotype B group were collected from sweetpotato and cotton in Beijing, tomato in Shandong, poinsettia in Shanghai and Guangdong, cabbage in Fujian, and...

Ten populations of the whitefly Bemisia tabaci (Gennadius) collected from eight fieed and ornamental crops from seven provinces/cities in China were determined using RAPD PCR. Results showed that the 10 populations of B.tabaci could be classified into three distinct groups: a Biotype B group, a Guangxi group, and a Fujian group. The whiteflies in the Biotype B group were collected from sweetpotato and cotton in Beijing, tomato in Shandong, poinsettia in Shanghai and Guangdong, cabbage in Fujian, and hemp and eggplant in Xinjiang. The Guangxi group were collected from pumpkin in Nanning, Guangxi, and the Fujian group, from sweetpotato in Fujian. It was notable that B.tabaci specimens collected on cabbage in Fujian belonged to the Biotype B group. It is clear that Biotype B does now occur in China, in Beijing, Shandong, Xinjiang, Shanghai, Fujian and Guangdong. It is likely that the Guangxi and Fujian groups are native to China.

应用RAPD PCR技术研究了中国大陆 10个烟粉虱种群的生物型情况。聚类分析表明 :这 10个种群中包含了 3种生物型 :烟粉虱B型、广西型 (南宁南瓜寄主 )和福建型 (福州地瓜 )。值得注意的是 ,在福建并存着两种烟粉虱生物型 ,即甘蓝上的B型烟粉虱和甘薯上的福建福州型。研究表明烟粉虱B型已经传入中国 ,至少在北京、山东、新疆、福建、广东等地都有发生和分布。广西型和福建型是否中国的本土种群还需进一步研究

The research results on the vegetation restoration are reviewed,and ecological strategies and approaches for vegetation restoration are probed into in the hilly area of Taihang Mountain.According to the basic characteristics of the modern ecotone and vegetation restoration in the study areas,6 ecological strategies on the vegetation restoration and reconstruction are put forward.The approaches of vegetation restoration are discussed from the point view of applying the closed method to make full use of the resilience...

The research results on the vegetation restoration are reviewed,and ecological strategies and approaches for vegetation restoration are probed into in the hilly area of Taihang Mountain.According to the basic characteristics of the modern ecotone and vegetation restoration in the study areas,6 ecological strategies on the vegetation restoration and reconstruction are put forward.The approaches of vegetation restoration are discussed from the point view of applying the closed method to make full use of the resilience of natural vegetation,human being-accelerated methods to speed up the restoration process of natural vegetation and reconstructing a completely new type of eco-economic communities by selecting the perennial plant species such as the native species and naturalized species with higher eco-economic values.Some problems of the vegetation degradation,restoration and reconstruction should be settled in the future study,such as the ecological effects of spatial heterogeneity of the small scale to the vegetation restoration;constructing the eco-economic community to form the ecological buffering zone at the ecotone between the fertile farmland and natural vegetation;identifying the relationship between plant reproductive strategies of the natural vegetation and disturbance;and taking the natural communities locating at the flat between the cliffs as the reference model of vegetation restoration characterized by little disturbance from human beings in the hilly area of Taihang Mountain.

对太行山低山丘陵区的植被恢复研究成果进行回顾总结,并探讨太行山低山丘陵区植被恢复的生态对策和途径。基于该地区现代生境和植被退化的基本特征,总结植被恢复与构建的6项生态原则,提出植被恢复的途径:实施封禁措施充分利用天然植被的自然恢复力,采取人工促进措施,加速天然植被恢复进程,选择现有生态经济价值较高的本土种和归化种等多年生植物构建生态经济群落。对今后有关植被退化、恢复与构建尚待研究的问题进行了探讨,诸如:小尺度空间异质性对植被恢复产生的生态效应;在肥沃农田与天然植被之间的生境上,构建的生态经济群落,形成生态缓冲区;认识天然植被植物繁殖对策与干扰的关系,以太行山低山丘陵区陡峭悬崖之间的平台地段受人类干扰较轻的自然群落作为植被恢复的参照目标等。

An invasive species Alternanthera philoxeroides and its indigenous congener A. sessilis were compared in the vegetative growth, photosynthesis and chlorophyll fluorescence. Stem tip cuttings of the herbs werecultivated for 28 d in 5 light growth chambers at 10℃, 15℃, 20℃, 25℃, 30℃, respectively. Results showed that the main stems of A. philoxeroides developed with lower accumulated effective temperature (AET)(11.6 d ℃) than that of A. sessilis (27.0 d ℃), but the new leaves of A. philoxeroides emerged with more...

An invasive species Alternanthera philoxeroides and its indigenous congener A. sessilis were compared in the vegetative growth, photosynthesis and chlorophyll fluorescence. Stem tip cuttings of the herbs werecultivated for 28 d in 5 light growth chambers at 10℃, 15℃, 20℃, 25℃, 30℃, respectively. Results showed that the main stems of A. philoxeroides developed with lower accumulated effective temperature (AET)(11.6 d ℃) than that of A. sessilis (27.0 d ℃), but the new leaves of A. philoxeroides emerged with more AET (12.1 d ℃) than that of A. sessilis (6.7 d ℃). Main stems and leaves of A. philoxeroides started to grow at lower temperatures, 10.4℃ and 11.0℃, respectively, than A. sessilis which needed 12.8℃ and 14.9℃, respectively, indicating that A.philoxeroides was less sensitive to low temperature than A. sessilis. Data of photosynthesis and chlorophyllfluorescence revealed that the maximum net photosynthetic rate (NPR) in A. philoxeroides was higher than that in A. sessilis, so was light saturation point (LSP), esp. at 25℃. The maximal photochemical efficiency (Fv/Fm) varied slightly for A. philoxeroides in the range of 10-30℃, which, however, rapidly declined for A. sessilis at 10℃. It might be concluded that high growth rate in main stems, wide range of temperature adaptation and strong capacity for photosynthesis would be important factors for the invasion of A. philoxeroides.

比较温度对入侵种喜旱莲子草(Alternantheraphiloxeroides(Mart.)Griseb.)和其本土近缘种莲子草(A.sessilis(L.)DC.)的营养生长、叶片光合作用及叶绿素荧光的影响。实验将生长均衡的这两种植物放在不同温度(10℃、15℃、20℃、25℃、30℃)的光照培养箱中处理28d。结果表明,喜旱莲子草营养生长的速率和对温度的响应明显不同于莲子草:前者主茎生长的有效积温明显低于后者,分别是11.6d℃和27.0d℃;而新叶萌发的有效积温高于后者,分别是12.1d℃和6.7d℃。入侵种主茎和叶的发育起点温度都比本土种低,分别是10.4℃、11.0℃和12.8℃、14.9℃,表明喜旱莲子草的发育对低温反应不及莲子草敏感。对两种植物叶片的光合作用和叶绿素荧光的测定结果还表明:入侵种比本土种有较高的最大净光合速率和光饱和点,尤其在25℃时;10-30℃的温度范围内喜旱莲子草的最大光化学效率Fv/Fm没有显著变化,而莲子草在10℃低温条件下Fv/Fm值显著降低。较快的主茎生长速率、较宽的温度适应范围以及较高的光合能力可能使喜旱莲子草比本地种具有更强的竞争力,从而...

比较温度对入侵种喜旱莲子草(Alternantheraphiloxeroides(Mart.)Griseb.)和其本土近缘种莲子草(A.sessilis(L.)DC.)的营养生长、叶片光合作用及叶绿素荧光的影响。实验将生长均衡的这两种植物放在不同温度(10℃、15℃、20℃、25℃、30℃)的光照培养箱中处理28d。结果表明,喜旱莲子草营养生长的速率和对温度的响应明显不同于莲子草:前者主茎生长的有效积温明显低于后者,分别是11.6d℃和27.0d℃;而新叶萌发的有效积温高于后者,分别是12.1d℃和6.7d℃。入侵种主茎和叶的发育起点温度都比本土种低,分别是10.4℃、11.0℃和12.8℃、14.9℃,表明喜旱莲子草的发育对低温反应不及莲子草敏感。对两种植物叶片的光合作用和叶绿素荧光的测定结果还表明:入侵种比本土种有较高的最大净光合速率和光饱和点,尤其在25℃时;10-30℃的温度范围内喜旱莲子草的最大光化学效率Fv/Fm没有显著变化,而莲子草在10℃低温条件下Fv/Fm值显著降低。较快的主茎生长速率、较宽的温度适应范围以及较高的光合能力可能使喜旱莲子草比本地种具有更强的竞争力,从而在其入侵过程中起了重要作用。

 
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