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diffusion of
相关语句
  扩散
    DIFFUSION OF PHOSPHATE IN SOILS Ⅳ.PREDICTION
    土壤磷扩散规律及其能量特征的研究 Ⅳ.土壤磷扩散的预测
短句来源
    (2)In two different soils studied,the ionic diffusion of granulated superphosphatewithin a certain distance corresponds to the Fick's log C=log A-Kx~2 relation.
    颗粒磷肥在土壤中的离子扩散,在一定距离范围内符合log C=log A-kx~2的Fick扩散定律。
短句来源
    Special designed container was used to simulate diffusion of urea and investigate changes of NH~+_4, NO~-_2 and NO~-_3 concentrations, and their transformation.
    采用特制模拟容器,通过尿素扩散形成营养斑,观察斑内NH+4、NO-2和NO-3浓度变化及它们之间的相互转化。
短句来源
    Effect of diffusion of urea patch on microbial communities in soil
    尿素肥斑扩散对土壤微生物群落结构的影响
短句来源
    Film Diffusion of Ions as Considering the Impact of Electric Field from Soil Particle Surface
    考虑土粒表面电场作用下的离子液膜扩散
短句来源
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  扩散规律
    DIFFUSION OF PHOSPHATE IN SOILS Ⅳ.PREDICTION
    土壤磷扩散规律及其能量特征的研究 Ⅳ.土壤磷扩散的预测
短句来源
  “diffusion of”译为未确定词的双语例句
    INVESTIGATION ON THE FACTORS AFFECTING THE DIFFUSION OF PHOSPHATE IN PADDY SOIL
    影响水稻土磷素扩散的某些因素
短句来源
    Effect o fWater Content and Bulk Density on the Diffusion of Chloride Ions in Soils
    水分和容重对土壤Cl~-扩散的影响
短句来源
    DIFFUSION OF PHOSPHATE IN SOILS Ⅰ.THE INFLUENCE OF SOIL MOISTURE,TEXTURE AND TEMPERATURE AS WELL AS THEIR INTERACTIONS
    土壤磷扩散规律及其能量特征的研究──Ⅰ.水分、质地、温度及其相互作用对磷扩散的影响
短句来源
    Investigation on the Factors Affecting the Diffusion of Phosphatein Soils of Shanxi Province
    陕西土壤磷素扩散的某些影响因素的研究
短句来源
    DIFFUSION OF PHOSPHATE AND ITS ENERGETIC CHARACTERISTICS IN SOILS:Ⅱ.INFLUENCE OF PHOSPHORUS APPLICATION RATE AND ITS INTERACTION WITH SOIL MOISTURE OR/AND TEMPERATURE
    土壤磷扩散规律及其能量特征的研究Ⅱ.施磷量及水肥温相互作用对磷扩散的影响
短句来源
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  diffusion of
One DR peak associated with the short-distance diffusion of oxygen vacancies was observed in both temperature and frequency spectra.
      
The method of NMR spin echo with the magnetic field pulse gradient was used for studying self-diffusion of water molecules in the radial root direction.
      
Diffusion of an Organic Cation into Root Cell Walls
      
Nonspecific pore-forming proteins (porins) are the major proteins of the outer membrane of Gram-negative bacteria responsible for diffusion of low-molecular-weight compounds.
      
Furthermore, these inhibitors not only reduce the local tissue damage but also retard the easy diffusion of systemic toxins and hence increase survival time.
      
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For the study of the micro-regional properties of soils,microelectrodes are useful forthe measurements of redox potential,pH value and electric conductance.When the buffered solutions were saturated with quinhydrone,the values of theoretical potentials canbe obtained by the micro pt electrode with a diameter of 0.5 mm and length of 0.2 mm.If redox potentials of soils are ranged from 80 to 450 mv,2—5 mv lower than the ordinary large electrode were found as measured by the microelectrode.For the measure-ment of...

For the study of the micro-regional properties of soils,microelectrodes are useful forthe measurements of redox potential,pH value and electric conductance.When the buffered solutions were saturated with quinhydrone,the values of theoretical potentials canbe obtained by the micro pt electrode with a diameter of 0.5 mm and length of 0.2 mm.If redox potentials of soils are ranged from 80 to 450 mv,2—5 mv lower than the ordinary large electrode were found as measured by the microelectrode.For the measure-ment of pH value of air-dried soils,the difference between the micro quinhydrone electrode and the glass electrode was insignificant.In water-logged soils with a redoxpotential below 350 mv,however,the experimental error may be 0.3—0.6 pH unit.In the measurement of electric conductance with microelectrodes,the apparent cellconstants increased with increasing concentration of KCl solution even after platinizationof the electrodes,if the length of the Pt or Ni wire in the cells is less than 1 mm and thtance between these two wires less than 1 mm.In the experiments,the reproducibility of the measured apparent cell constants at different intervals was favorable andcalibration curve can be used for correction.The results of application of the microelectrodes are summarized as follows:(1)For soil clods containing large amount of easily decomposable organic matter,the redox potential in the central part of the soil clod may be 220 mv lower than thesu(?)face.The electric conductance at the surface was 10—20% higher than the centralpart.(2)In two different soils studied,the ionic diffusion of granulated superphosphatewithin a certain distance corresponds to the Fick's log C=log A-Kx~2 relation.(3)The root system of buckwheat decreased the pH value of soils in the rhizosphere from 6.22 to 5.10 and increased the specific conductance by about 52 per cent ascompared with the bulk soil.The specific conductance of soils in the rhizosphere of ricewas 37 per cent lower than the bulk.The root of all the tested plants exc ricelowered the redox potential in the soils of rhizosphere.(4)For rice plant collected from five plots of different levels of soil fertility,theratio of electric conductance between the soil and the rice roots was found to be constant,as 0.31±0.02 in average.The electric conductance in the functional leaves also increased with the increase of conductance of the soil.

为了研究土壤电化学性质的微域变化,应用微电极,测定了氧化还原电位、pH 和电导。结果表明,在含氧化还原体系的标准液中,测得的电位值与理论值相符,在土壤中,数值可较大电极低2—5毫伏。在应用微氢醌电极法测定土壤的pH 时,对干土所得的结果与玻璃电极数值一致;对于还原性土壤,不能够应用。在应用微电极测定电导时,对于长1毫米,极间距离1.1毫米的电极,在不同浓度溶液中可得一致的电导池常数,对于更小的电极,电导池常数随溶液电阻的减小而增大。在土壤中长期磨擦时,可导致电导池常数的稍许增加。应用了标准线的方法校正了这些误差。土块表面的氧化还原电位,较其内部为高。表面的电导也可以较内部高10—20%。颗粒磷肥在土壤中的离子扩散,在一定距离范围内符合log C=log A-kx~2的Fick扩散定律。荞麦使根际土壤的pH 降低,电导升高,氧化还原电位升高;水稻使根际土壤的电位升高,pH 降低,电导降低;小麦和大豆使根际土壤的电位降低。水稻根系的电导,与土壤中者保持一基本固定的比例。

Three simple equations for the relatioships beLween the water content at wetting front and the average water content in the wetting zone, during the redistributions of soil water in unsaturated soils both vertically and horizontally, are described in this paper. Based on both vertical infiltration and horizontal diffusion of soil water in unsaturated soils, analytical expressions for hydraulic conductivity, water diffusivity and specific water capacity were derived. The resulting expressions for the three...

Three simple equations for the relatioships beLween the water content at wetting front and the average water content in the wetting zone, during the redistributions of soil water in unsaturated soils both vertically and horizontally, are described in this paper. Based on both vertical infiltration and horizontal diffusion of soil water in unsaturated soils, analytical expressions for hydraulic conductivity, water diffusivity and specific water capacity were derived. The resulting expressions for the three hydraulic parameters contain four independent parameters which can be obtained by fitting the proposed equations to experimental data. Compared with previous methods of predicting hydraulic conductivity and water diffusivity, the new method in this paper has advantage of less time-consuming and expensive, more accurte and wider range of application over them.

本文根据—维非饱和土壤水分的垂直入渗再分布和水平扩散再分布,采用土壤湿润剖面平均湿度和湿润锋湿度之间函数关系的三种形式,分别推导出非饱和土壤导水率,水分扩散率,比水容量的解析表达式,解析表达式中仅有四个独立参数,均可通过实验数据的简单拟合而得到。与其它方法相比,这种新的推求方法具有花费少、准确度高和测定范围大等特点。

The simulated experiment under rainproof in field was done to study the characteristicsof energy variation and distribution in SPAC in the different treatments of water supply levels.Theresults showed that the leaf water potentoal was linearly decreased with the decrease of the soil wa-ter potential,and it was affected by the pneumatic potential.but the effect of the soil water poten-tial to the leaf water potential was greater than that of the pneumatic potential.During the growthof the crop,the leaf water...

The simulated experiment under rainproof in field was done to study the characteristicsof energy variation and distribution in SPAC in the different treatments of water supply levels.Theresults showed that the leaf water potentoal was linearly decreased with the decrease of the soil wa-ter potential,and it was affected by the pneumatic potential.but the effect of the soil water poten-tial to the leaf water potential was greater than that of the pneumatic potential.During the growthof the crop,the leaf water potential displayed the dynamic variation characteristics of the decreasingstage at first and thd increasing stage at latter. The dynamic feature of the root xylem water poten-tial variation was the same as that of the leaf water potential variation,the root xylem water poten-tial was larger than the corresponding leaf water potential,the difference value was the range of0.25~0.60MP_a. In the five different treatments of water supply levels,the loss of energy of waterfrom soil to root xylem was the range of 0.81~1.41 MP_a,0.91~1.56MP_a,0.94~1.67MP_a,0.92~1.68MP_a,0.77~1.82MP_a,respectively;from roct xylem to leaf was the range of 0.25~0.50MP_a,0.28~0.53MP_a,0.3~0.60MP_a,0.33~0.67MP_a,respectively;and from substomatalcavities to atmosphere was the range of 55 36~111.30MP_a,55.14~111.14MP_a,55.01~111.09MP_a,54.61~111.04MP_a,54.46~110.97MP_a,respectively. Therefore,when water floW-ing in SPAC,the vaporization of water in leaf and the diffusion of water vapor were main positionsof energy transformation and loss,and the main energy loss of liquid water flowing took place in theconnecting “chain”through which water entered the root from soil.

该文用田间遮雨棚下模拟土柱的试验方法,研究了不同水分水平处理下土壤-植物-大气连续体中能量变化和分布规律。结果表明,植物叶片水势既随土壤水势的下降而按直线变化规律递减,也随大气水势而变化,但土壤水势对植物叶片水势的影响要比大气水势的影响大些;在玉米的整个生长过程中,植物叶片水势还表现出先下降阶段后上升阶段的动态变化特性。植物根木质部水势动态变化规律与叶水势的动态变化规律非常相同,植物根木质部水势均大于相对应的叶片水势,两者相差0.25~0.60MP_a。在5个不同水分水平处理中,水分从土壤输送到植物根木质部,其能量降低分别为0.81~1.41MP_a,0.91~1.56MP_a,0.94~1.67MP_a,0.92~1.68MP_a,0.77~1.82MP_a;从植物根木质部到叶部能量损失分别为0.25~0.50MP_a,0.28~0.53P_a,0.30~0.57MP_a,0.30~0.60MP_a,0.33~0.67MP_a;水分从叶部汽化扩散到大气中其能量降低分别为55.36~111.30MP_a,55.14~111.14MP_a,54.61~111.04MP_a,54.46~110.97MP_a。则?

 
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