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

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 th...

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Bibliographic Details
Published in:Geosciences (Basel) 2018-04, Vol.8 (4), p.134
Main Authors: Matsumoto, Shinji, Ogata, Shunta, Shimada, Hideki, Sasaoka, Takashi, Hamanaka, Akihiro, Kusuma, Ginting
Format: Article
Language:English
Subjects:
Accelerated erosion
acidic conditions
Aggregation
alkaline conditions
Aluminum
artificial rainfall test
Clay
Clay minerals
Clay soils
Earth science
Erosion
Magnesium
Minerals
Moisture content
Molecular chains
pH effects
Physical characteristics
physical characteristics of soils
Physical properties
Plastics
Rain
Rainfall
Rainmaking
Soil
Soil erosion
Soil investigations
Soil particles
Soil pH
Soil physical properties
Soil properties
Soil water
soil water erosion
Southeast Asian countries
Tropical climate
Tropical climates
Water
Water erosion
Zeta potential
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Summary: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.
ISSN:2076-3263
2076-3263
DOI:10.3390/geosciences8040134