Sulfur and molybdenum fractionation in marine and riverine alluvium paddy soils
Autor: | Radziah Othman, Mohamed M. Hanafi, Mohd Khanif Yusop, Hamed Zakikhani, Amin Soltangheisi |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Health
Toxicology and Mutagenesis chemistry.chemical_element Soil science Fractionation 010501 environmental sciences Toxicology 01 natural sciences molybdenum lcsh:Environmental pollution Cation-exchange capacity Drainage Paddy Subsoil lcsh:Environmental sciences 0105 earth and related environmental sciences lcsh:GE1-350 Chemical Health and Safety 04 agricultural and veterinary sciences Sulfur alluvial soil chemistry sulfur Soil water lcsh:TD172-193.5 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Alluvium Carbon |
Zdroj: | Chemical Speciation & Bioavailability, Vol 28, Iss 1-4, Pp 170-181 (2016) |
ISSN: | 2047-6523 0954-2299 |
Popis: | Intermittently submergence and drainage status of paddy fields can cause alterations in morphological and chemical characteristics of soils. We conducted a sequential fractionation study to provide an insight into solubility of Sulfur (S) and Molybdenum (Mo) in flooded alluvial paddy soils. The samples (0–15 and 15–30 cm) were taken from marine and riverine alluvial soils in Kedah and Kelantan areas, respectively, and were sequentially extracted with NaHCO3, NaOH, HCl, and HClO4–HNO3. Total S in upper and lower layers of Kedah and Kelantan ranged between 273 and 1121 mg kg−1, and 177 to 1509 mg kg−1, respectively. In upper layers and subsoil of Kedah, average total Mo were 0.34 and 0.27 mg kg−1, respectively. Average total Mo in Kelantan were 0.25 mg kg−1 (surface layer) and 0.28 mg kg−1 (subsoil). Cation exchange capacity (CEC) was positively correlated with plant available amounts of Mo in upper layers of Kedah area. Also, total and medium-term plant-available S was correlated with total carbon (C) at lower layers of Kelantan soil series. But in surface layers of Kelantan soil series, CEC was strongly correlated with total and medium-term plant-available S. Our results indicates that the influence of flooding conditions on soil S and Mo contents in paddy fields may cause long-term changes in S and Mo chemical reactivities. |
Databáze: | OpenAIRE |
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