Effects of pH-Induced Changes in Soil Physical Characteristics on the Development of Soil Water Erosion

Geosciences

Shunta Ogata¹  Hideki Shimada¹  Takashi Sasaoka¹  Akihiro Hamanaka¹  GintingJalu Kusuma²  Shinji Matsumoto³ 

[1] Department of Earth Resources Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 8190395, Japan;Department of Mining Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia;Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Higashi 1-1-1, Ibaraki, Tsukuba 3058567, Japan;

关键词: soil water erosion;    physical characteristics of soils;    acidic conditions;    alkaline conditions;    artificial rainfall test;    Southeast Asian countries;   

DOI  :  10.3390/geosciences8040134

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown