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weathering rates
相关语句
  风化速率
    REVIEW ON WEATHERING RATES IN THE CRUST WEATHERING SYSTEM
    地壳风化速率研究综述
短句来源
    The weathering rates of soils in China were estimated through the mass balance approach, simulated leaching experiments, PROFILE model, MAGIC model, and two empirical methods.
    利用模拟淋溶实验、质量平衡法、PROFILE模型、MAGIC模型以及两种经验方法对中国十几种主要土壤类型的风化速率进行了研究 .
短句来源
    Results show that the weathering rates of soils are very low (usually lower than 1.0? keq·ha -1 ·a -1 ) in the allite areas (including latosol, lateritic red earth, red earth, yellow earth, and yellow brown earth) in south China, and the silalsol areas (consisting of dark brown forest soil, black soil, and podzolic soil) in northeast China. These soils are therefore sensitive to acid deposition.
    研究表明 ,中国南方富铝土区域 (包括砖红壤带、赤红壤带、红壤黄壤带和黄棕壤带 )以及东北的硅铝土区域 (包括暗棕壤黑土带和漂灰土带 )的风化速率普遍较低 (通常低于 1.0keq·ha-1·a-1) ,土壤缓冲酸沉降的能力较弱 .
短句来源
  风化率
    Constraints on Silicate Weathering Rates in Different Settings:Climatic or Tectonic?
    不同构造带硅酸盐化学风化率的制约:气候还是构造?
短句来源
    The dissolved and particulate loads of the river are used to estimate the physical erosion and chemical weathering rates over the world drainage basins, respectively.
    讨论了运用河流的颗粒相和溶解相载荷分别去估算机械剥蚀率和化学风化率的科学性及各种计算方法。
短句来源
    Based on the compilation of chemical weathering rates of silicate minerals and physical erosion rates in different settings, this study shows that weathering rates and tectonic and climatic changes on different spatial and temporal scales have coupling or even conflicting relationships.
    综合不同构造区内岩石物理剥蚀率和硅酸盐化学风化率的数据表明,不同时间、空间尺度硅酸盐风化率与构造和气候之间既存在相互耦合也存在矛盾的关系,仅仅归因于单一要素是不能得到圆满解释的。
短句来源
  “weathering rates”译为未确定词的双语例句
    Due to the ignorance of CA as an activator in weathering, previous studies of weathering undoubtedly underestimated weathering rates, and hence the contribution of weathering to the atmospheric CO 2 precipitation was also underestimated.
    毫无疑问 ,已往的研究由于未认识到CA在风化中的催化作用 ,因此低估了风化作用的速率 ,同样也低估了风化作用对大气CO2沉降的贡献。
短句来源
    to the present. This implies a general rise in mechanical erosion rates might couple with a general decline in chemical weathering rates over the past 2.5 Ma.
    自2.5MaB.P.
短句来源
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  weathering rates
An increase in sedimentary Mn and Fe concentrations is related to elevated continental weathering rates and to widespread dys- or anoxia that favored metal deposition in Valanginian sediments.
      
The parameters contributing most to the uncertainty in critical loads were weathering rates, base cation uptake rates, and choice of critical chemical value, indicating possible research priorities.
      
This result could be attributed to increased weathering rates due to climate warming.
      
In three non-acidified watersheds in Japan, arealchemical weathering rates of primary minerals are much largerthan those observed in U.S.A.
      
Weathering rates at the present pH values in forested loess and clay soilsranged from 135 to 6000 molc ha-1 a-1 in loesssoils and from 100 to 1750 molc ha-1 a-1 in claysoils.
      
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The thickness of weathering rind on sandstone gravels from river terrace and alluvial fan deposits in Guangdong area increases with time. The growth curve of weathering thickness has been determined by using age control from radio carbon, thermolumi-nesecence and ESR techniques, showing the exponential decay of weathering rate. Weathering-rind thickness thus provives a measure of the age of deposits or geomorphic surfaces:T = 1485D4.13Where T=age in years, and D = weighted mean thickness...

The thickness of weathering rind on sandstone gravels from river terrace and alluvial fan deposits in Guangdong area increases with time. The growth curve of weathering thickness has been determined by using age control from radio carbon, thermolumi-nesecence and ESR techniques, showing the exponential decay of weathering rate. Weathering-rind thickness thus provives a measure of the age of deposits or geomorphic surfaces:T = 1485D4.13Where T=age in years, and D = weighted mean thickness in mm of about 50 gravels from the surficial part of deposit.Using this method, the authors have determined the ages of two types of geomorphic surfaces in Guangdong area. The ages of the first and second river terraces are determined as 1 000-13300 yrs, and 8600-26500 yrs., respectively; while those of the first-and second-order alluvial fans along the northern front of Zhaoqing basin as 51500 and 24400 yrs., respectively. Based on these data and geomorphic analysis of tectonic deformation, the rates of vertical faulting for three major NE-trending fault zones in the area can be estimated as 0.6-1.6mm/yr. for the period before mid-Holocene, and much less value for Latest Pleistocene.

广东地区河流阶地和冲积扇沉积物中砂岩砾石风化晕随时间增厚。风化晕生长速度呈指数衰减,并拟合于下列公式:T 1485D~(4.13)这里T=时间,以年表示,D=沉积物表部约50块砾石风化晕厚度的加权平均值,以毫米表示。利用风化晕厚度确定出广东地区河流第一和第二级阶地分别为1000—13300年和8600—26500年,肇庆盆地北部山前地带第Ⅰ和第Ⅱ级冲积扇分别为51500年和24400年。同时,在构造地貌变形分析的基础上,估算出本区三条主要北东向断裂带在晚更新世—中全新世的垂直断层作用速度为0.6—1.6毫米/年,中全新世甚或晚更新世晚期以来的活动速度极小。

With the advances of theory and analysis technique of Sr isotopes, the application of stable Sr isotope as tracers of biogeochemical processes on both the catchment and global scales has increased considerably in recent years, and it continues to provide new insight into many different research problems. This paper reviews the basic principle, main research content and recent progresses of using Sr isotopes to trace nutrient element circulation and hydrochemical evolution in ecosystems. The authors emphasize...

With the advances of theory and analysis technique of Sr isotopes, the application of stable Sr isotope as tracers of biogeochemical processes on both the catchment and global scales has increased considerably in recent years, and it continues to provide new insight into many different research problems. This paper reviews the basic principle, main research content and recent progresses of using Sr isotopes to trace nutrient element circulation and hydrochemical evolution in ecosystems. The authors emphasize the application of strontium isotopes to study mineral weathering rates, identify resources of nutrient elements, calculate circulation fluxes of the elements and trace hydrochemical evolution mechanism of groundwater. At the same time, the authors point out the complexity and problems needing attention when Sr isotope are used as tracers of biogeochemical processes. At last, the potential application of strontium isotope to trace biogeochemical processes is discussed.

综述了Sr同位素示踪生态系统离子循环和水化学演化的基本原理、主要内容和最新进展。着重介绍了Sr同位素在矿物风化速率研究、流域营养离子来源识别及其循环通量计算、地下水体化学成分演化机制的研究中的示踪应用;最后展望了Sr同位素在生物地球化学过程示踪上的潜在价值。

The weathering rates of soils in China were estimated through the mass balance approach, simulated leaching experiments, PROFILE model, MAGIC model, and two empirical methods. Results show that the weathering rates of soils are very low (usually lower than 1.0? keq·ha -1 ·a -1 ) in the allite areas (including latosol, lateritic red earth, red earth, yellow earth, and yellow brown earth) in south China, and the silalsol areas (consisting of dark brown forest soil, black soil, and podzolic...

The weathering rates of soils in China were estimated through the mass balance approach, simulated leaching experiments, PROFILE model, MAGIC model, and two empirical methods. Results show that the weathering rates of soils are very low (usually lower than 1.0? keq·ha -1 ·a -1 ) in the allite areas (including latosol, lateritic red earth, red earth, yellow earth, and yellow brown earth) in south China, and the silalsol areas (consisting of dark brown forest soil, black soil, and podzolic soil) in northeast China. These soils are therefore sensitive to acid deposition.

利用模拟淋溶实验、质量平衡法、PROFILE模型、MAGIC模型以及两种经验方法对中国十几种主要土壤类型的风化速率进行了研究 .研究表明 ,中国南方富铝土区域 (包括砖红壤带、赤红壤带、红壤黄壤带和黄棕壤带 )以及东北的硅铝土区域 (包括暗棕壤黑土带和漂灰土带 )的风化速率普遍较低 (通常低于 1.0keq·ha-1·a-1) ,土壤缓冲酸沉降的能力较弱 .

 
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