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土壤     
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  soil
    STUDY ON SOIL FERTILITY OF KOREAN PINE PLANTATIONS
    红松人工林土壤肥力的研究
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    Vegetation Carrying Capacity of Soil Water in a Semi-arid Region of Loess Hilly in the Loess Plateau
    黄土丘陵半干旱区土壤水分植被承载力研究
短句来源
    Dynamics of Soil Properties and the Effect Factors Among Secondary Successive Communities in Mt.Jinyun
    缙云山森林群落次生演替中土壤特性动态变化及其影响因素研究
短句来源
    A Study on Forest Soil CO_2, N_2O and CH_4 Emission Flux and Dynamics in Xishan Area, Beijing
    北京西山地区森林土壤中CO_2、N_2O和CH_4气体的排放通量及动态研究
短句来源
    Response of Gingko Biloba to Soil Water Stress
    银杏对土壤水分胁迫的响应
短句来源
更多       
  soils
    Study on Labile Organic Carbon Pool in Forest Soils
    森林土壤活性有机碳库的研究
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    THE APPLICATION OF COMPUTER GRAPHICS IN STUDYING DYNAMIC PROPERTIES OF FOREST SOILS*
    计算机技术在森林土壤定位研究中的应用
短句来源
    A DISCRIMINANT ANALYSIS OF PROPERTIES OF SOILS FOR SLASH PINE
    湿地松适生土壤条件的判别分析
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    Vertical Distribution of Forest Soils in Yulong Mountain.
    丽江玉龙山森林土壤垂直分布
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    Dynamics of Enzyme Activities of Soils in Repeated Plantation of Chinese-fir Woodland
    林地土壤酶活性季节动态
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更多       
  the soil
    Study on the Soil Fertility Change and Long-Term Maintenance of Productivity in Chinese Fir Plantation
    杉木林土壤肥力变化和长期生产力维持研究
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    Make Use of the Root Systems of Bush-grass to Protect the Soil Resources
    灌草丛根系在保护土壤资源上的研究
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    A Study on the Soil Deterioration of the First Generationof Artificial Fir Plantation in Jiangxi Province
    江西省第一代人工杉木林土壤退化的研究
短句来源
    QUANTITATIVE STUDY ON THE SOIL WATER DYNAMICS OF VARIOUS FOREST PLANTATIONS IN THE LOESS PLATEAU REGION IN NORTHWESTERN SHANXI
    晋西北黄土区人工林土壤水分动态的定量研究
短句来源
    A STUDY ON THE SOIL MANAGEMENT MODEL FOR POPLAR PLANTATION IN HUAIBEI COAL MINE COLLAPSED AREA
    淮北煤矿塌陷区杨树人工林土壤管理模式的研究
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更多       
  matter of soil
    Surface roots were abundant in Avicennia marina forest, so organic matter of soil in top layer (0-20cm) was the most there.
    的白骨壤(Avicennia marina)林,表层土壤有机质含量高,而在地表少根而
短句来源
    (2) Through green manuring,organic matter of soil increases by 0.37 g·kg~(-1)~0.55 g·kg~(-1);
    (2)种植绿肥压青,土壤有机质增加0.37g. kg-1~0.55g.
短句来源
    Dissolved Organic Matter of Soil and Forest Floor in Forest Ecosystems
    森林土壤和枯枝落叶层DOM的研究
短句来源
    the soil under the forest grows steadily, the glutinous granules in the surface layer increased by 5% ̄10% and the organic matter of soil increased by 1%;
    林下土壤稳定发育,表土层粘粒增加5%~10%,土壤有机质增加1%,土壤结构形成;
短句来源
    The results show that after harvesting, the pH value of soil increases, the organic matter of soil and soil nutrient(N、P、K) obviously increases in the early days and soon afterwards fast decreases to the level which is lower than that before harvesting.
    结果表明:森林采伐后,土壤pH值增加,土壤有机质和土壤养分(N、P、K)初期表现为明显增加,随后又迅速减少,以至低于采伐前水平。
短句来源

 

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      soil
    An antibiotic producing strain Streptomyces violaceusniger was isolated from soil sample, characterized and studied for antibacterial and antifungal activity profile.
          
    These points can be estimated by introducing the soil factor (Ks) and tree species factor (Kt) to potential evapotranspiration with the Penman formula.
          
    Root biomass, length, and the number of roots in every diameter class, for each soil layer and for each plant species, are regarded as observation variables.
          
    The results show that most of the vertical distributions of plant roots belong to the type wherein the roots are concentrated in the topsoil layer (0-20 cm), far more than those in the lower soil layers.
          
    Ecological Benefit of Reforestation in a Severely Degraded Red Soil Region
          
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      soils
    Baldcypress should not be planted in drought-stricken soils.
          
    Characteristics of the temperature coefficient, Q10, for the respiration of non-photosynthetic organs and soils of forest ecosys
          
    The temperature coefficient, Q10 (fractional change in rate with a 10°C increase in temperature) describes the temperature sensitivity of soils, roots, and stems, as well as their possible performance in global warming processes.
          
    The differences between woody organisms of stems, roots, and soils excluding roots were statistically significant (p>amp;lt;0.05), indicating that heterotrophic respiration from microorganism activity may be more sensitive to global warming.
          
    The contents of aggregates of over 0.25 mm in two shrub land soils in the upper layer (0-20 cm) increased by 4.6% and 14.1% compared with farmland.
          
    更多          
      the soil
    These points can be estimated by introducing the soil factor (Ks) and tree species factor (Kt) to potential evapotranspiration with the Penman formula.
          
    (2) Soil aeration and the soil air regime improved.
          
    Three years after 50% thinning and 100% clear-cutting, the loss of carbon storage in the soil (0-60 cm) of cutover areas was 16.14 and 45.15%, respectively.
          
    Carbon storage in unburnt soil (0-45 cm) reached 73.36 t/hm2, which was 15.20 t/hm2 higher than that in the soil of burnt areas.
          
    A total of 20.7% of carbon storage in the soil (0-45 cm) of burnt areas was lost 40 days after burning.
          
    更多          
      matter of soil
    Both the clay minerals and organic matter of soil contribute to the adsorption of organic compounds on soil but the clay minerals bentonite and montmorillonite play a major role in their adsorption on soil.
          
    For the other field, it's simply a matter of soil type.
          


    1、The most important point of reforestation in the saline and alkaline soil dis- trict is, first of all, to understand the conditions of the habitat form of planting area. In accordance with the different conditions of habitat form, the principle of right species in tbe right site and the rational composition of plantation, the plant percent is promoted. 2、Based upon the conditions of climate, topography and soil, such three main factors as the amount of salt in soil, the water level of soil and the texture...

    1、The most important point of reforestation in the saline and alkaline soil dis- trict is, first of all, to understand the conditions of the habitat form of planting area. In accordance with the different conditions of habitat form, the principle of right species in tbe right site and the rational composition of plantation, the plant percent is promoted. 2、Based upon the conditions of climate, topography and soil, such three main factors as the amount of salt in soil, the water level of soil and the texture of soil may be used as references in classifying the conditions of habitat form. The salt con- tent is divided into four groups: less than 0.3%, 0.3--0.5%, 0.5--1% and more than 1%; the water level of soil is classified into two classes: one is more than I meter, other is less than 1 meter; the texture of saline soil is grouped into three classes: heavy clay, sandy loam-clay loam, light loam-medium loam. Total in all there are eleven conditions of habitat form. 3、On the most especially heavy saline soil (the salt content is more than 1%) no reforestation is avaitable or plant Tamarix juniperina, Populus euphra- tica after the soil is transformed into less salted. On the heavy saline soil (the salt content is more than 0.5--1%) plant Tamarix juniperina, Populus euphratica and Populus canadensis. On the favorable saline soil (the salt contlnf is 0.3- 0.5%) Tamarix, Amorpha fruticosa, Poplus euphratica, Populus canadensis, Ulmus pumila, Salix mastudana, Elaeagnus erispa, Fraxinus americana, Robinia pseudo-acacia may be planted. On light Ealine soil (the salt contlnrt less than 0.3%) Aitan- thus altisslma, Ziziphus jujub, Morus alba, Phellodendron amurense, Thuja orientalis may be panted besides those species mentioned above.

    作者分析了营口地区盐渍土的土壤植被条件,提出以土壤盐分含量、地下水位和土壤质地作为立地条件的主要因子,将该地区的造林立地条件划分为十一种类型。进一步分析了该地造林树种的生物学特性,按不同立地条件类型分别提出了适宜的造林树种。

    1、In the eastern mourntain region of Liaoning province, there were many areas of natural growth which were destroyed long pears ago by natural or artifial force. These devastated forest sited after ten or tweney years are regenerated into sapling wroods of seconalary forest. 2、Classifying the types of thess secondary forests aceording to the following four principles: a) The mountain site: as altitude, slope and quality of the site etc. b) The social conditions. c) The association of forest plarts. d) The...

    1、In the eastern mourntain region of Liaoning province, there were many areas of natural growth which were destroyed long pears ago by natural or artifial force. These devastated forest sited after ten or tweney years are regenerated into sapling wroods of seconalary forest. 2、Classifying the types of thess secondary forests aceording to the following four principles: a) The mountain site: as altitude, slope and quality of the site etc. b) The social conditions. c) The association of forest plarts. d) The management of the forest and economical conditions. 3、These principles abost the classifying type of the secondary forest are right- fully adopted in the eastern mountain region of Liaoning province.

    作者根据辽宁东部山区的自然历史、社会条件及次生林的特点,讨论了国内外林学家划分山地森林的原则,认为可应用苏氏林型学说,综合考虑地型、土壤、植物群落及社会条件等因子,来具体划分次生林林型。在次生林型分类上可采用植被区、垂直植被带、林型组及林型等四级系统,用地形、植被及优势树种三名法命名。

    1、The constitution of the quick-growing and good harvest forest of Populus canadensis consists of the form of planting composition and planting distance. It de- termines the nursing and leaves' space, large or small, of forest tree, hence it in- fluences the amount of out-pat aud quality of timbers. There are differeut opinions to the proper constitution. To study it is very important. 2、In foreign countries the constitution of poplar forest is quite different. The form of planting is sometimes square or rectangle....

    1、The constitution of the quick-growing and good harvest forest of Populus canadensis consists of the form of planting composition and planting distance. It de- termines the nursing and leaves' space, large or small, of forest tree, hence it in- fluences the amount of out-pat aud quality of timbers. There are differeut opinions to the proper constitution. To study it is very important. 2、In foreign countries the constitution of poplar forest is quite different. The form of planting is sometimes square or rectangle. Some countries adopt close plant- ing, and others adopt open. In general, square and rectangle are adopted in artificial forest of Populus canadensis, while triangle planting is rearly used. A tendeucy is to use close planting. There are 400 to 40,000 planting thocks in per hectare. The difference is 100--times. 3、The rational close planting of Populus canadensis is right triangle aud square, because in such condition the orown may be normally developed, and striaght bole maintained. In the oircumstances of the same planting distance, the right triangle planting site produces 15.5% more products than thesquare (planting). Populus canadesis is a very intolerant species with high adaptability and de- mands water more than fertilizer. As the climatical and soil conditions are favourable, especially water is available and guaranteed, the density of planting may be deter- mined according to the following factors: (1) In eccordance with the table of the average height and diameter of tree in relating to the planting distance, at the first intermittent cutting, to resolve the planting distance: As the average height and diameter of the tree is known, at the first intermittent cutting, the corresponding rational distance of the first planting will be then easy found out from the table. on the other hand, the square value of the normal growing crown is used as a standard to determine the nursing spare and planting distance. In the mean time the first intermittent cutting year may be ob- tained. (2) To find out the rational close of planting by means of the soil fertility and the intensity of managenient: When the condition of soil fertility and water is suitable and the intensity of management is high, the trees grow fast the crown clo- sure is quick, open stocked in first planting is all right, dsing 3.5 × 4--6 × 6 M. in distance. If the condition of site is not good the site should be planted first close then open, using 1.3 × 1 .5--3 × 3 M. in distance promoting the crown in early closure, then thinning and transplanting the seedlings to the open site or plan- ting shrubs or farm crops between the rows of planting. (3) To find out the rational close of planting by means of the year and stan- dard of planting stocks: At the same conditions of site and management, one year seedlings or slips are used in close planting. While 2--3 year seedlings, 3--4 meters in height, are used in open planting. First close planting then open, as the plant- ing stocks grow 1--2 years 1ater, the dense stocked seedlings should be thinned and transplanted in the near by planting area. Then both sites become open stocked forests.

    加拿大杨速生丰产林的结构应着重研究杨林的配置方式和造林密度,因为它决定林木营养面积和叶面积你大小,从而影响椽木的产量和质量。作者建议采用正三角形或正方形配置,提倡稀植,每公顷277—714株,或者先密后稀,早期疏开。确定造林密度的因子,首先是依据第一次间伐时平均树商、平均胸径号造林密度关系表”确定造林密度,同时试用冠幅的平方值,作为计算林木营养面积的依据;第二是依据土壤肥力(特别土壤水分)专经营强度确定造林密度;第三是依据苗木年龄及规格确定造林密度。稀植加杨林,15年成林时,预计高达22米,胸径35厘米,每公顷木材蓄积量240—360立方米。

     
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