Transformation of calcium phosphates in alkaline vertisols by acidified incubation
| Autor: | Christopher Guppy, Karl O. Andersson, Wantana Klysubun, Cassandra R. Schefe, Leanne Lisle, Paul J. Milham, Enzo Lombi, Matthew Tighe, Timothy I. McLaren |
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| Přispěvatelé: | Andersson, Karl O, Tighe, Matthew K, Guppy, Christopher N, Milham, Paul J, McLaren, Timothy I, Schefe, Cassandra R, Lombi, Enzo, Lisle, Leanne M, Klysubun, Wantana |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Calcium Phosphates
chemistry.chemical_element agricultural practices Vertisol 010501 environmental sciences Calcium 01 natural sciences P-limited agricultural systems Phosphates Soil Environmental Chemistry Soil Pollutants Incubation Dissolution 0105 earth and related environmental sciences Phosphorus Sorption Agriculture General Chemistry Soil type X-Ray Absorption Spectroscopy chemistry Environmental chemistry Soil water acid-soluble soil phosphorus (P) |
| Popis: | Acid-soluble soil phosphorus (P) is a potential resource in P-limited agricultural systems that may become critical as global P sources decrease in the future. The fate of P in three alkaline Vertisols, a major agricultural soil type, after acidic incubation was investigated using synchrotron-based K-edge X-ray absorption near-edge structure (XANES) spectroscopy, geochemical modeling, wet chemistry soil extraction, and a P sorption index. Increases in labile P generally coincided with decreased stability and dissolution of calcium phosphate (CaP) minerals. However, only a minor proportion of the CaP dissolved in each soil was labile. In two moderate-P soils (800 mg P kg-1), XANES indicated that approximately 160 mg kg-1 was repartitioned to sorbed phases at pH 5.1 of one soil and at pH 4.4 of the second; however, only 40 and 28% were labile, respectively. In a high-P soil (8900 mg P kg-1), XANES indicated a decrease in P of 1170 mg kg-1 from CaP minerals at pH 3.8, of which approximately only 33% was labile. Phosphorus mobilized by agricultural practices without concurrent uptake by plants may be repartitioned to sorbed forms that are not as plant-available as prior to acidification Refereed/Peer-reviewed |
| Databáze: | OpenAIRE |
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