不可渗透的粘土限制了水和黄腐酸的向下渗透，从而减少了化学风化和土壤灰化作用。
Impermeable clay limits downward percolation of water and fulvic acids, reducing chemical weathering and podzolization.
下蜀土较强的化学风化过程可能受长江下游地区较强的季风性气候控制。
Strong chemical weathering underwent by the Xiashu loess might be related to strong monsoon climate in the lower reaches of the Changjiang River.
由于非连续特性，化学风化可增大水岩界面，提升矿物溶解反应的规模及速率。
Because of discontinuity, chemical weathering can add water-rock interface and raise mineral dissolution rate.
结果显示，紫色沉积岩发育的土壤，在一定程度上继承了母岩的特点，化学风化作用微弱。
The results show that the soils have, in varying degree inherited some properties of purple sedimentary rocks for their very weak chemical weathering.
不同风化程度的岩石处于整个化学风化过程的不同阶段，因而具有不同的化学成分和风化度指标。
Rocks with different weathering degrees should possess distinctive chemical compositions, which thus can be used to develop various weathering indices.
频率曲线众数峰含量随深度的变化，不但指示了化学风化趋势，而且反映了风化程度的变化梯度。
The variation of frequency curve's mode peak content with the increasing of depth, shows not only the trend of chemical weathering but also variation gradient of weathering extent.
同时，所有样品伊利石化学指数值均大于0.5，说明粘土矿物经历了强烈的化学风化作用，盆地内部为暖湿气候。
Chemical index of the illite samples is higher than 0.5, indicating that clay minerals had undergone strong chemical weathering and interior of the Basin had a relatively warm and wet climate.
因此，黄土-古土壤序列中元素含量的分布、化学综合参数等地球化学特征都对环境变化有直接的指示意义，代表了该区域化学风化的强度及时空规律。
Accordingly, the distribution of elements content and the chemical parameter all can show the variety of environment and intension of weathering in the Weihe Valley.
在碳酸盐岩地区，流域侵蚀过程中硫酸是否参与，对于我们正确理解流域化学风化速率，以及流域侵蚀对大气co2的消耗和全球碳循环等都有重要的意义。
It is important to ascertain the role of sulfuric acid in carbonate weathering so as to understand the chemical weathering rate carbonate rocks, CO2 consumption and global carbon cycle.
在碳酸盐岩地区，流域侵蚀过程中硫酸是否参与，对于我们正确理解流域化学风化速率，以及流域侵蚀对大气co2的消耗和全球碳循环等都有重要的意义。
It is important to ascertain the role of sulfuric acid in carbonate weathering so as to understand the chemical weathering rate carbonate rocks, CO2 consumption and global carbon cycle.
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