Silicon Fractionation of Soluble Silicon in Volcanic Ash Soils That May Affect Groundwater Silicon Content on Jeju Island, Korea
| Autor: | Hae-Nam Hyun, Won-Pyo Park, Bon-Jun Koo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Hydraulic engineering
Geography Planning and Development sequential silicon extraction Fractionation 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry allophane lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 Allophane 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 readily soluble silicon 04 agricultural and veterinary sciences Andisol Pedogenesis Environmental chemistry Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Soil horizon Groundwater Volcanic ash |
| Zdroj: | Water, Vol 12, Iss 2686, p 2686 (2020) Water Volume 12 Issue 10 |
| ISSN: | 2073-4441 |
| Popis: | Silicon (Si) is found in various fractions of soil, depending on the pedogenic processes of the environment. Dissolved Si (DSi) is adsorbed in soil particles or leaches through the soil profile into the groundwater. The objective of this study is to quantify, using the sequential extraction method, the different Si fractions in volcanic ash soils on Jeju Island that may affect groundwater Si content, and to compare them with those in forest soils on mainland Korea. Most of the Si in these soils was bound in unavailable forms as primary and secondary silicates. The second largest proportion of Si in the non-Andisols of Jeju Island and Korean mainland soils was accumulated as amorphous Si, while in the Andisols of Jeju Island, the second most significant Si fraction was in pedogenic oxides and hydroxides. The products of these soil formations were short-range-order minerals such as allophane (4&ndash 40%). The adsorbed Si concentration tended to increase at lower depths in Andisols (100&ndash 1400 mg kg&minus 1) and was approximately five times higher than that in non-Andisols. The results indicate that Si is more soluble in the Andisols of high precipitation regions and that Andisols on Jeju Island potentially affect groundwater Si concentration. |
| Databáze: | OpenAIRE |
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