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forest tundra
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  “forest tundra”译为未确定词的双语例句
     According to the historical documents, as early as back in 2000 BC ,their ancestors already lived in wender forest tundra,over of Nibuchu river,north-east part of out Baigal lake and Baigal lake From 16th century to the mid-17 century, following wild deer, they came to the area near Weile river ,branch of lena river and Weitmu, north-west of Baigal lake.
     据史书记载,驯鹿鄂温克人的祖先在公元前2000年就居住在外贝加尔湖和贝加尔湖东北部尼布楚河上游的温多山林苔原高地。 到了16世纪至17世纪中叶,他们追随野生驯鹿至贝加尔湖西北列拿河支流威吕河和维提姆河一带。
短句来源
     Forest, tundra, peat bog and soil organic matter are main carbon stocks. Green plant is a main CO 2 absorber, soil is a fundamental CO 2 source in natural ecosystem of Russia. Russian natural ecosystem is one of biggest CO 2 absorber & source on the Earth.
     简要地介绍了俄罗斯自然生态系统中的碳循环状况.在俄罗斯的自然生态系统中,森林、冻土、泥炭沼泽和土壤有机质是碳的重要贮存库.绿色植物是主要的CO2吸收器.土壤是CO2的主要释放源.俄罗斯的自然生态系统是地表最大的CO2吸收和贮存库之一.
短句来源
     To clarify the relation between the pollen percentage of Larix and its stand density, surface samples from tundra, forest tundra and taiga in the Far East Russia were analyzed.
     为了搞清楚落叶松花粉百分比和实际森林密度的关系,我们系统地分析了从苔原、森林苔原以及泰加林的表土样品。
短句来源
  相似匹配句对
     forest .
     林。
短句来源
     Importance of Ecologic Environment Protection of Tundra Forest in Daxinganling Area
     重视大兴安岭寒区脆弱的冻土森林生态环境的保护
短句来源
     The Harmony in the Forest
     森林中的和谐
短句来源
     The Disappearing Tundra
     行将消逝的苔原
短句来源
     Voices from the Tundra
     来自北极冰原的呼唤
短句来源
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  forest tundra
In the forest tundra, black spruce thrives in protected areas and exhibits a normal arborescent growth form, but in exposed sites, upright stems are damaged above the snowpack by snow abrasion and wind.
      
We selected low shrub, tall shrub, and forest tundra sites near treeline in northwestern Alaska, representing the major structural transitions expected in response to warming.
      
Over three years, we found a consistent CO2 efflux from forest tundra of the Russian North throughout the year, including a large (89 g C m-2 yr-1) efflux during winter.
      
Historical evidence and climatic implications of a shift in the boreal forest tundra transition in central Canada
      
The lakes are situated between 61°N-70°N latitudes from the southern boreal coniferous region up to the forest tundra ecotone.
      
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Environmental evolutions in the eastern China have the hollowing characters: 1. Quaternary environmental changes are mainly controlled by global climatic variations. 2. The sensitive regions of environmental changes are between the middle part of Northeast China and the middle part of Central China. The environmental variations of the former were between the forest-tundra of cool temperate zone and the deciduous broadleaved forest of warm temperate zone, and those of the latter were between...

Environmental evolutions in the eastern China have the hollowing characters: 1. Quaternary environmental changes are mainly controlled by global climatic variations. 2. The sensitive regions of environmental changes are between the middle part of Northeast China and the middle part of Central China. The environmental variations of the former were between the forest-tundra of cool temperate zone and the deciduous broadleaved forest of warm temperate zone, and those of the latter were between the broadleaved forest with grassland of warm temperate zone and the broadleaved evergreen forest of south subtropic zone. 3. The coldest and dry climate appeared about 18000-15000 years ago in Late-Pleistocene, When the annual average temperature decreased about 8癈 compared with that of today, and the natural environmental zones moved southward about 1000 km in Northeast China and North China. The hottest and wet climate appeared in middle Pleistocene, when the temperature increased 4℃ compared with that of to-day and natural environmental zones moved northward about 700 km in North China. 4. The general tendency of Quaternary environmental variations was to become dry and the continentality of climate was from strength to strength in the eastern China during Quaternary. 5. The natural environmental variations of the southern part of Central China and South China were smaller than those to the north of them, and the tempertural variations were about 3-5癈 6. We found that the sporo-pollen assemblages in the "glacial boulder clay beds" of Mt. Lushan and Huangshan all belong to warm and wet forest environment, There fore, the problem of glaciation in Mt. Lushan and Huangshan is questionable.

根据第四纪地层内孢粉组合和动物群等新资料恢复了我国东部各大区域第四纪各个时期的自然环境特征,其温暖期与干冷期的交替与深海沉积O~(18)温度变化趋势大致对应。庐山三次“冰期冰碛层”内孢粉组合表明均为温暖湿润针阔叶混交林景观,而不是寒冷的冰川环境。

Pollen records from peat deposits in the Middle Mackintosh Creek, southwest Yukon Territory, Canada indicate that change of pollen spectra from peat deposits can be caused by the evolution of local environmental condition related to geomorphological process. A significant decrease of Picea pollen percentages in about 20% at the upper part of the pollen diagram has been interpreted as the result of a substitution of shrub birch community for the sedges, because the change of microtopography resulted from the...

Pollen records from peat deposits in the Middle Mackintosh Creek, southwest Yukon Territory, Canada indicate that change of pollen spectra from peat deposits can be caused by the evolution of local environmental condition related to geomorphological process. A significant decrease of Picea pollen percentages in about 20% at the upper part of the pollen diagram has been interpreted as the result of a substitution of shrub birch community for the sedges, because the change of microtopography resulted from the development of a palsa field in the bottom of valley improved the drainage condition, therefore favoured the expansion of shrub birch community which is a heavy pollen producer. Consistent values of Picea pollen concentration support this interpreation. The regional spruce forest-tundra vegetation of the creek has had little change since the eruption of White River ash at 1230 yr B. P. Accordingly, it is important to distinguish the local and regional pollen spectra in terms of the reconstruction of environmental history.

育空西南部多年冻土区一条泥炭剖面的花粉分析资料表明,泥炭花粉谱可以因地貌过程而发生较大变化。受花粉产量悬殊的两个土著群落生态性更替的影响,代表区域性植被面貌的云杉花粉百分含量在后期大幅度降低(但其花粉浓度并未发生明显变化)。这一特点与该区广泛发育的泥炭丘地的形成密切相关,而不代表区域性云杉森林—苔原植被面貌在过去的1230年中曾有明显的改变。因此,在古环境研究中,区分局部性与区域性花粉谱变化有着重要的意义。

With transect sampling,effects of forest boundary forms on specie composition and its distribution and on growth and death of colonizing woody plants were measured at the birch forest tundra ecotone in Changbai Mountain,Northeastern China.The boundary microclimate relative to forest boundary forms,causes of colonizing patterns,and timberline dynamics were also studied. Betula ermanii and Alnus mandshurica predominated in the colonizing woody species on forest boundaries.In...

With transect sampling,effects of forest boundary forms on specie composition and its distribution and on growth and death of colonizing woody plants were measured at the birch forest tundra ecotone in Changbai Mountain,Northeastern China.The boundary microclimate relative to forest boundary forms,causes of colonizing patterns,and timberline dynamics were also studied. Betula ermanii and Alnus mandshurica predominated in the colonizing woody species on forest boundaries.In general,transects facing concave boundaries had higher values of colonizing distance and stems,mean base diameters,total base areas and average heights of colonizing stems than those next to convex and straight boundaries respectively.Those adjacent to convex boundaries presented minimum values and decreased abruptly with increase of distance from timberline.Dieback rate and branching number increased with increasing distance from forest boundaries.The dead colonizing stems in transects next to concave boundaries had a wider range of and higher averages of base diameter than those of the transects adjacent to straight and convex boundaries.The numbers of dead colonizing stems were high in transects next to concave boundaries and low in those of convex ones.The death peaks of colonizing stems were in accordance with those of living stems along the transects next to concave boundaries.Density dependent process may be the major cause of death.However,the dead stems were concentrated at the middle or tail parts of transects next to straight and convex boundaries.So the severe microclimate may be the cause of death.The forest boundary forms were originated from heterogeneity of micro topography.The comprehensive effects of ecological factors such as wind and snow distribution and the spatial combination of ecological flows produced the patterns of colonization in various boundary forms.Therefore,boundary form may exert powerful control of the patterns of tundra colonization.The timberline in Changbai Mountain has not reached its potential altitude.The “concave convex reversal”effect resulted by boundary forms may be one of the causes of birch timberline climbing.

采用样带调查法测定了长白山岳桦林缘形状对入侵苔原木本植物组成和分布、树木生长和死亡的影响 ,阐述了林缘形状形成与生境小气候的关系 ,探讨了不同形状林缘更新格局形成的原因和林线的动态。林缘入侵物种主要由岳桦和东北赤杨组成。凹型林缘外入侵树木向苔原侵展的距离和茎数 ,以及平均基径、基面积之和及平均高度均明显高于直线型和凸型林缘 ,其中凸型林缘的值最低 ,且随远离林缘降低最为迅速。随远离林缘入侵植株枯梢率增高 ,分枝数增多。凹型林缘外死亡植株具有较宽的径阶和较大径级 ,平均死亡植株数也最多 ,而凸型林缘则最低。凹型林缘死亡植株数的峰值与入侵植株数量的高峰区间吻合 ,密度制约可能是幼树死亡的主要原因 ;直线型和凸型林缘林缘植株死亡峰位于茎数较少的样带中部和尾部 ,环境的恶劣性可能是植株死亡的主要原因。林缘小地形异质性是产生林缘形状的根本原因 ,林缘形状引起的入侵格局的显著差异是风和积雪等生态因子和生态流在空间上重新组合的结果 ,林缘形状对木本植物向苔原侵展具有强有力的控制作用。长白山岳桦林线尚未达到应有的潜在高度 ,林缘形状引起的“凹凸逆转”的生态效应可能是岳桦林线上升的一种机制

 
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