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forest
相关语句
  森林
    Forest,Soil and Water
    森林、土壤和水
短句来源
    Forest in Mountainous Ecosystem and Its Relationship With Production
    森林与山区生态系统及其生产的关系
短句来源
    DEMAND-SUPPLY FORECAST OF FOREST ENERGY IN HUNAN BY THE YEAR 2000
    湖南省2000年森林能源需求预测
短句来源
    STUDIES ON NOISE TREATMENT OF FOREST DYNAMICAL MODEL AND THE DYNAMICAL PREDICTION OF FOREST RESOURCE
    森林资源动态模型噪声处理与预测
短句来源
    Forest Resource Models Simulation Research.
    森林资源模型仿真研究
短句来源
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  林地
    Study on Bearing Capacity of Forest Land in Mountainous Regions
    山区林地承载能力研究
短句来源
    From point of use manner,desertification cultivated land,desertification forest land,desertification grassland and unused desertification land is 1.1%,24.8%,65.8 and 8.3% respective.
    沙化耕地占1.1%,沙化林地占24.8%,沙化草地占65.8%,未利用沙化土地占8.3%;
短句来源
    Study on Nitrogen Loading of Sludge Treatment Through Forest
    污泥林地处理氮素负荷的研究
短句来源
    Effect of Simulated Acid Rain on Mercury Leaching from Forest Yellow Soil
    模拟酸雨对林地黄壤汞溶出的影响
短句来源
    But the capability of Cd2+ and Cu2+ adsorption and the buffer capacity is forest soil > farm soil >meadow soil.
    但对Cu~(2+)、Cd~(2+)的吸附作用力强度、最大缓冲容量的顺序为林地>农田>草地。
短句来源
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  “forest”译为未确定词的双语例句
    A Study on Security Management of Forest Trucks
    运材汽车安全管理的研究
短句来源
    A Planning Model of Xinjiang Man-made Forest and Applying
    新疆平原人工林发展规划数学模型及其应用
短句来源
    Studies on the Disposition and Benefits of Coastal Defence Forest in Liaoning Province
    辽宁省沿海防护林的配置及其防护效益
短句来源
    Restoration Ecology and Restorotion of Tropical Rain Forest
    恢复生态学与热带雨林的恢复
短句来源
    (5) Annual Fcb of the forest in 2003 was estimated as 787.4 296.8gCm-2a-1, which was 17% lower than soil respiration measured by statistic chamber method.
    (5)2003年鼎湖山针阔叶混交林Fcb总量((787.4±296.8)gCm-2a-1)比静态箱-气相色谱法测得的土壤呼吸偏低17%。
短句来源
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  forest
Moreover, a backward reasoning forest of a reachable marking was generated for explicitly representing reachable paths in RBS.
      
Growth Model System for National Continuous Forest Inventory
      
A Growth Model System is developed for data updating and forecasting of the national continuous forest inventory.
      
Its design is based on the inherent forest growth laws, and its parameters are estimated by modern regression methods.
      
It is suitable for forest resource information updating and forecasting for a large region, e.g., a province.
      
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This Paper describes a diffusion method to seperate fluorinc of plant ma-terial directly from other interferring ions for its determination.After wash-ing with tap water, plant samples were dried at 85℃ for 24-48 hrs.,milledand passed through a 100 mesh sieve.Put the dried powder into a small sty-rene plastic round vessel,o.d. 6cm and 2cm high,with tight cover.Put thesample in the central part at thc bottom, and keep it free from the side wallof the vessel, otherwise, the diffusion process may be affected, Wetting...

This Paper describes a diffusion method to seperate fluorinc of plant ma-terial directly from other interferring ions for its determination.After wash-ing with tap water, plant samples were dried at 85℃ for 24-48 hrs.,milledand passed through a 100 mesh sieve.Put the dried powder into a small sty-rene plastic round vessel,o.d. 6cm and 2cm high,with tight cover.Put thesample in the central part at thc bottom, and keep it free from the side wallof the vessel, otherwise, the diffusion process may be affected, Wetting with2ml distilled water, mixing with 2 ml 70% perchloric acid,and put on the co-ver, which has a thin layer of NaOH formed by spreading 0.2 ml IN NaOHin ethyl alcohol on the inner surface.Put the vessel under 50℃±1℃ anddiffusion for 18-20 hrs. At end of the diffusion the diffusate was dissolvedwith H_2O from the cover,the fluorine content was determined by alizarincomplexone spectrophotometrically. The recovery of fluorine from standard NaF solution,either witn or withoutplant samples,is higher than 95%.Experimental error of this method comparedwith that of ashed at 550℃ after adding Mg(NO_3)2, is less than 5%,thatproves this method is satisfactory. Using this method we have determined the F content of leaf, bark andfruit samples from forest and fruit trees,vegetables and farm crops.we aresatified witn our data.

本文报导了用扩散法直接从植物样品中分高氟,以除去干扰离子。样品用水冲洗后,在85℃干燥24—48小时,磨碎后过100目筛。样品放在聚苯乙烯塑盒(外径为6厘米、高2厘米)的底部,先用2毫升蒸馏水湿润,然后加入2毫升70%高氯酸,摇匀并盖好,盖的内面涂有1N NaOH乙醇溶液0.2毫升,干燥后使用。扩散条件:温度50℃±1℃,时间为18—20小时。扩散后,用菌素酪合酮分光光度法测定含氟量。 结果表明,标准氟化钠在有无植物样品时回收率均高于95%;直接扩散与加Mg(NO_3)_2在550℃灰化后扩散相比较,两者误差一般不超过±5%。我们用此方法测定了多种树木、果树、蔬菜和农作物的叶片、树皮和果实较为满意。

This paper emphasizes the point with the expected results of noise attenuation by various forms of urban planting around Beijing City. In general, the forest brings about an excess of attenuation of 1 dB(A) every 10 meters, the trees on the pavement and the lane-separated trees have the effect of noise reduction only 2.5 dB(A), wbereas the mixed structures consisting of hedge, trees, shrubbery and grass have better effect. For example, noise may be lowered 5 dB(A) on the average for the mixed green belt...

This paper emphasizes the point with the expected results of noise attenuation by various forms of urban planting around Beijing City. In general, the forest brings about an excess of attenuation of 1 dB(A) every 10 meters, the trees on the pavement and the lane-separated trees have the effect of noise reduction only 2.5 dB(A), wbereas the mixed structures consisting of hedge, trees, shrubbery and grass have better effect. For example, noise may be lowered 5 dB(A) on the average for the mixed green belt with high canopy density.

本文试图通过对北京地区的不同绿化结构声衰减的测量和分析,找出减噪效果较好的绿化结构形式。从各种绿化结构的声衰减结果可以看到绿篱、乔灌木和草坪构成的绿带效果较好,平均可以减噪5dB(A)。

Based on the data studied for many years by our group and then published, research information on selenium in the environment and living beings in the world, geographic belts of selenium distribution in vegetation, animals and human bodies in all over the world is analysed in this paper. It is suggested that there is a low-selenium zone which takes the humic and semi-humic forest, forest-grassland in the temperate zone and the mediterranean type regions in the middle and high latitudes of the southern...

Based on the data studied for many years by our group and then published, research information on selenium in the environment and living beings in the world, geographic belts of selenium distribution in vegetation, animals and human bodies in all over the world is analysed in this paper. It is suggested that there is a low-selenium zone which takes the humic and semi-humic forest, forest-grassland in the temperate zone and the mediterranean type regions in the middle and high latitudes of the southern and northern hemisphere as the center, where selenium response symptoms in man and animal occur, caused by the low-selenium ecological chain in the primary geographic environment. From the view point of the relation between the primary and secondary environment, it is proposed that regional distribution of selenium in the environment is of significance in both environment study and evaluation.

本文根据作者所在研究组多年研究发表的数据、综合世界上有关环境和生物中硒的研究资料,分析了植物、动物和人体组织中硒在世界上基本一致的带状地理分布特征。提出世界上有一低硒带,这一低硒带以地球上南北半球中高纬度温带湿润、半湿润森林、森林草原带和地中海型自然地区为中心。并以原生地理环境低硒生态链所引起的人和动物硒反应症的分布为特征。从原生环境和次生环境关系的角度提出环境中硒的区域分异在环境研究和评价中的意义。

 
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