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weathering rates
相关语句
  风化速率
    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
    Through simulated leaching experiment, weathering rates of several soils (including latosol, lateritic red earth, red earth, yellow brown soil and purplish soil) in China, as well as the effects of soil pH value and precipitation rate on soils weathering, were studied.
    利用模拟淋溶实验测定了中国几种土壤 (砖红壤、赤红壤、红壤、黄棕壤和紫色土 )的风化速率 ,并研究了土壤pH值和降水量对土壤风化速率的影响 .
短句来源
  风化率
    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。
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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 chemical composition of natural surface water not only reflects the characteristics of natural environment in the area of standing water, but also deter -mines the main chemical properties of the water body. The basic hydrochemical composition is dependent on the dissolved matters in meteoric water and on the dissolvable matters in soils and rocks during weathering and erosion. The investigation on hydrochemical compositions of several plateau lakes and reservoirs (say, Dianchi Lake in Kunming, Erhai...

The chemical composition of natural surface water not only reflects the characteristics of natural environment in the area of standing water, but also deter -mines the main chemical properties of the water body. The basic hydrochemical composition is dependent on the dissolved matters in meteoric water and on the dissolvable matters in soils and rocks during weathering and erosion. The investigation on hydrochemical compositions of several plateau lakes and reservoirs (say, Dianchi Lake in Kunming, Erhai Lake in Dali, Changqiaohai Lake and Datun Lake in Mengzi, as well as swarms of reservoirs in Central Guizhou Province) indicates that: 1 ) Only a little influence on the basic composition of surface water is imposed by the meteoric water; 2 ) The chemical weathering rate in Central Guizhou is more affected by acid rain than the areas of Erhai, Dianchi and Mengzi; 3) Within a same standing water basin, the chemical. weathering rate in teaching-dissolving area is higher than that in accumulation area;4)For water bodies associated with a same river valley, the chemical weat hering rate increases with increasing area of standing water; 5 ) The intensity of human activities plays an extremely considerable influence on the chemical weathering rate, resulting in a direct change of the concentrations of the 3 basic components,namely, Cl-, Na+ and K+, in water bodies; 6) The total concentration of so-called "three sorts of nitrogen" (i. e. , nitrogen of nitrate, nitrite and ammonia) in the swarms of reservoirs in Central Guizhou is 10 tiroes higher than in Erhai Lake, Dianchi Lake, Changqiaohai Lake and Datun Lake in Yunnan province. The ratio of N3+ over the total "three sorts of nitrogen" can be used as an indicator of pollution degree of water bo dies, because N3+ is an intermittent product during the processes of nitrification and denitri-fication; 7)Phosphorus content in water bodies in Central Guizhou is one magnitude higher than that in lakes in Yunnan Province; 8 ) The oxidation indices (Fe3+//Fe2+) and (DO/COD) show a certain correlation with the degree of pollution.

天然地表水的基本化学组分不仅反映了积水区域内的自然环境特征、而且决定了水体的主要化学性质。水化学基本组分取决于积水区内大气降水中的溶解物质和土壤岩石的风化侵蚀可溶性产物。对昆明的滇池、大理的洱海、蒙自的长桥海和大屯海、以及黔中地区的水库群等若干高原湖泊水库水化学组分的研究表明:大气降水来源对各地区地表水基本组分影响不大;黔中地区化学风化速率受酸性降水的影响比洱海、滇池、蒙自地区略高;在同一积水盆地,淋溶区化学风化速率较聚积区高;同一流域水体,随积水区域面积的增大,化学风化速率不断增大;人为活动的强度对化学风化速率有极为显著的影响,直接改变了水体中Cl~-、Na~+、和K~+三种基本组分的含量;黔中水库群的三氮总量比洱海、滇池、长桥海和大屯海高出近十倍;N~(3+)作为硝化和反硝化过程的中间产物,在三氮总量中所占比例可以作为判断水体污染程度的指标;黔中水体中磷含量较云南湖水高一个数量级;水体氧化性指标〔Fe~(3+)/Fe~(2+)〕和〔DO/COD〕与污染程度有一定关系。

Difference in natural weathering rates of crude oil and fuel oil and effectof weathering rate by microbiological levels were studied in laboratory based on the complet-ed natural weathering model of petroleum hydrocarbons in seawater.The results showedthat the weathering rate of crude oil was lower than that of fuel oil.The percent of hydro-carbon degrated and the constant of weathering rate were not affected by the hydrocarbon-degrating bacterial levels in seawater although the...

Difference in natural weathering rates of crude oil and fuel oil and effectof weathering rate by microbiological levels were studied in laboratory based on the complet-ed natural weathering model of petroleum hydrocarbons in seawater.The results showedthat the weathering rate of crude oil was lower than that of fuel oil.The percent of hydro-carbon degrated and the constant of weathering rate were not affected by the hydrocarbon-degrating bacterial levels in seawater although the degrated quantities of hydrocarbon wereincreased with rises of microbiological level.The weathering rate of petroleum hydrocarbonswas only a function of the oil concentrations in seawater,and independent of microbiologicallevels,because the hydrocarbon-degrating bacterial levels were actually a function of the oilconcentration in seawater.

在研究了海水中石油烃自然风化模式的基础上,以实验室模拟,研究了原油和燃料油自然风化速率的差异以及微生物含量对风化速率的影响,结果表明,原油的自然风化速率稍低于燃料油,尽管微生物含量增加使其对石油烃降解的绝对量明显增加,但对烃类被降解的百分率以及风化速率常数基本上没有影响。由于微生物的含量本身就是海水中石油烃含量的函数,因此石油烃的风化速率仅为油含量的函数,而与微生物的含量无关。

The cation exchange and the chemical weathering are two important processes for sedi-ments to buffer the acidification of surface water. In this paper, for sediments these two processeshave been studied. The relationship between BFC of sediments and ANC of the surface waters andthe weathering characteristics of sediments were discussed. The buffering effect and mechanism of sedi-ments against acidic deposition have also been studied. The results show that BFC of sediments arepositively correlative...

The cation exchange and the chemical weathering are two important processes for sedi-ments to buffer the acidification of surface water. In this paper, for sediments these two processeshave been studied. The relationship between BFC of sediments and ANC of the surface waters andthe weathering characteristics of sediments were discussed. The buffering effect and mechanism of sedi-ments against acidic deposition have also been studied. The results show that BFC of sediments arepositively correlative to ANC of the surface waters. the chemical weathering rate of sediments can beexpressed as R=k×[H ̄ +] ̄m.

ThebufferingeffectsofaquaticsedimentsagainstacidicdepositionLiaoBohan;TangHongxiao(ResearehCenterforEco-EnvironmentalSciences...

 
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