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weathering rates
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  风化速率
    For the same vegetation type, minerals weathering rates and differences of the dominant weathering minerals type in soil profiles were mainly depended on the distribution and winding characteristic of plant roots of ≤1 mm in diameters.
    不同植被类型土壤风化速率及主导风化矿物组合类型的剖面差异主要受制于直径≤1mm的须根在剖面中的缠绕分布特征。
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    The soil depths of plant roots significantly intensifying minerals weathering rates were 0~45 cm for wood and 0~30 cm for grasses. The effective root density of woodland and grassland on minerals weathering rates of soil were 17 roots per 100 cm~2 and 60 roots per 100 cm~2 in soil profile.
    油松林群落和白草群落根系显著提高矿物风化速率的稳定土层深度范围分别为0~45cm和0~30cm,有效根密度分别在17根/100cm2和60根/100cm2以上。
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 .
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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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Pot and field weathering experiments of purplish rock formed in the Jurassic (group Penglaizhen J 3p, group Saximiao J 2s, and group Suining J 3s) and Cretaceous (group Chengqiangyan K 1c) period were conducted to study the soil formation and nutrient release Results showed soil formation rates are 15800 25500 t/km 2 a and the rank of weathering sequence is J 3s>J 3p>J 2s>K 1c Weathering rates of purplish rock are much influenced by conditions interfering weathering...

Pot and field weathering experiments of purplish rock formed in the Jurassic (group Penglaizhen J 3p, group Saximiao J 2s, and group Suining J 3s) and Cretaceous (group Chengqiangyan K 1c) period were conducted to study the soil formation and nutrient release Results showed soil formation rates are 15800 25500 t/km 2 a and the rank of weathering sequence is J 3s>J 3p>J 2s>K 1c Weathering rates of purplish rock are much influenced by conditions interfering weathering such as frequently moving and overturning is quicker Pot's weathering is slower than fields weathering due to more exposition to the sunlight and rainfall Nutrient release of purplish rock is in the same step with weathering Based on pots weathering results, 52 78, 121 31, 3948 4 and 31 13, 71 81, 2016 9 grams of nitrogen, phosphorus and potassium are released from a cubic meter of J 3p and K 1c purplish rock,respectively,within a year And potassium release is outstanding Rapid release of nutrients from weathering of purplish rock is of paramount importance to nutrient replenishments of purplish soil and also the essence of fertility of purple soil

通过田间实验与盆钵模拟, 研究侏罗系蓬莱镇组(J3p)、遂宁组(J3s)、沙溪庙组(J2s) 和白垩系城墙岩群(K1c)紫色母岩的风化和养分释放过程。结果表明,紫色母岩的成土模数为15800~25500t/km 2.a, 其风化顺序为: J3s> J3p> J2s> K1c;风化条件对风化进程影响较大, 模拟风化过程中, 扰动取样更快, 而田间比盆钵模拟风化快2~4 倍。紫色母岩养分释放与风化同步。盆钵模拟风化实验结果表明,1m3J3p 和K1c紫色母岩风化一年,分别有52.78、121.31、3948.4和31.13、71.81、2016.9gN、P、K释放出来。紫色母岩养分风化释放是紫色土养分补偿的重要过程,也是紫色土肥力的主要特点。

Based on the semi quantitative approach,4 environmental factors of sites (i e bedrock lithology,soil type,land use,and rainfall) are categorized,weighted and combined to determine and assess the relative sensitivity of the soils to acidic deposition over Fujian Province Then the factors have been digitized and combined to assign an overall value to each mesh square by using the geographic information system (GIS) The results indicate that the most sensitive area in Fujian is mainly located in the Southeast...

Based on the semi quantitative approach,4 environmental factors of sites (i e bedrock lithology,soil type,land use,and rainfall) are categorized,weighted and combined to determine and assess the relative sensitivity of the soils to acidic deposition over Fujian Province Then the factors have been digitized and combined to assign an overall value to each mesh square by using the geographic information system (GIS) The results indicate that the most sensitive area in Fujian is mainly located in the Southeast except a small part in the Northwest,and the least sensitive area is distributed sporadically in the East along the coast Due to slow weathering rate of siliceous rocks,acid to weakly acid reactions of the soils,along with the greater percent of coniferous forests,more than 60% of the total area exhibits higher sensitivity classes (5~7)

选择母岩、土壤类型、土地利用和降雨量 4个生态因子 ,应用半定量化方法对其进行类目划分和权重 ,综合评价了福建省土壤对酸沉降的相对敏感性 ,并应用地理信息系统进行了区划 .由于福建省风化缓慢的硅质岩所占的比例较大 ,土壤大多呈酸性至微酸性反应 ,降水丰富 ,加之针叶林面积大 ,所以全省有 60 %以上面积的土壤显示出较大的敏感性等级 (5~ 7级 )

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. During the experiment, the weathering rate increased with the leachant pH falling off to 4\^0, but decreased evidently when pH<4\^0 due to the high concentration of reaction products such as Al\+\{3+\} and base cation....

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. During the experiment, the weathering rate increased with the leachant pH falling off to 4\^0, but decreased evidently when pH<4\^0 due to the high concentration of reaction products such as Al\+\{3+\} and base cation. In addition, the weathering rate decreased linearly with the reduction of percolation rate. The experimental results were adjusted by leachant pH and percolation rate.

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 .结果表明 ,土壤的风化速率在pH≥ 4时随pH值的下降而显著增加 ,但是当pH值低于 4时 ,风化速率却急剧下降 .造成这种现象的原因可能是在低pH值时盐基阳离子和铝离子大量溶出 ,过高的产物浓度限制了风化反应的进行 .土壤的风化速率与淋溶速率之间近似成线性关系 ,用淋溶液pH值和淋溶液量两个因素对实验结果进行了校正

 
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