Effects of pH-Induced Changes in Soil Physical Characteristics on the Development of Soil Water Erosion
Effects of pH-Induced Changes in Soil Physical Characteristics on the Development of Soil Water Erosion
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DOI：
10.3390/geosciences8040134
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
S. Matsumoto;Shunta Ogata;H. Shimada;T. Sasaoka;A. Hamanaka;G. J. Kusuma
中科院分区：
文献类型：
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作者：
S. Matsumoto;Shunta Ogata;H. Shimada;T. Sasaoka;A. Hamanaka;G. J. Kusuma
土壤水蚀是东南亚热带地区土壤的一个严重问题，pH值的变化影响着土壤水蚀的发展。通过人工模拟降雨试验，将pH值调节为2.0 ~ 10.0，研究pH值变化对土壤水蚀的影响。由于Al、Ca和Mg，在每个pH条件下zeta电位完全向正方向移动。在pH6.0 ~ 2.0范围内，粘土矿物释放的Al ~（3+）和土粒间的分子吸引力导致土粒聚集，使土壤塑性指数（IP）降低。在pH范围内，IP的减少导致了土壤水蚀的发展。当pH超过6.0时，土壤颗粒上的负电荷产生的排斥力IP减小，导致水加速侵蚀。结果表明，在富含Al、Ca、Mg的粘性土中，pH值的变化通过改变Zeta电位而引起土壤物理性质的变化，从而导致土壤水蚀的发展。
Soil water erosion is frequently reported as serious problem in soils in Southeast Asia with tropical climates, and the variations in pH affect the development of the erosion. This study investigated the effects of changes in pH on soil water erosion based on changes in the physical properties of the simulated soils with pH adjusted from 2.0 to 10.0 through artificial rainfall tests. The zeta potential was entirely shifted to positive direction at each pH condition due to Al, Ca, and Mg. In the pH range of 6.0 to 2.0, the aggregation of soil particles resulting from the release of Al3+ from clay minerals and/or molecular attraction between soil particles caused the plastic index (IP) of the soil to decrease. The decrease in IP led to the development of soil water erosion at the pH range. When the pH exceeded 6.0, the repulsive force generated by the negative charges on soil particles decreased IP, resulting in accelerated erosion by water. The results suggest that changes in pH causes physical properties of the soil to change through changes of the zeta potential in the clayey soil rich in Al, Ca, and Mg, leading to the development of soil water erosion.