Journalartikel
Autorenliste: Shaheen, Sabry M.; Wang, Jianxu; Baumann, Karen; Ahmed, Ashour A.; Hsu, Liang-Ching; Liu, Yu-Ting; Wang, Shan-Li; Kuehn, Oliver; Leinweber, Peter; Rinklebe, Joerg
Jahr der Veröffentlichung: 2022
Zeitschrift: Chemosphere
Bandnummer: 288
ISSN: 0045-6535
eISSN: 1879-1298
DOI Link: https://doi.org/10.1016/j.chemosphere.2021.132652
Verlag: Elsevier
Abstract:
Sustainable engineering and management of hydromorphic arable soils need deep knowledge about the redox-mediated interactions between nutrients and soil colloids. Consequently, we examined the redox-mediated in-teractions of P with metal oxides and organic carbon (OC) in toe-, mid-, and upper-slope arable soils under dynamic redox changes using geochemical (biogeochemical microcosm), spectroscopic (XANES), and molecular (quantum chemical calculations (QCC)) approaches. We controlled the redox potential (E-H) in two directions i.e., 1) slowly oxidizing direction (SOD; E-H increased from-286 to +564 mV); and 2) slowly reducing direction (SRD; E-H decreased from +564 to-148 mV). In the SOD of all soils, P, Fe2+ and OC mobilized at E-H <= 200 mV, due to the pH decrease from 7.2 to 4.1 and dissolution of Fe-oxyhydroxides/carbonates, as indicated by the decrease of Fe-P and Ca-P determined by P-K-edge-XANES. At E-H > 200 mV, P immobilized due to the strong P binding with Fe3+ as suggested by QCC. In the SRD of mid-slope-soil, P immobilized with decreasing E-H, due to pH increase and P retention by aromatic carbon and/or precipitation by carbonates, as supported by increase of organic-P and Ca-P. These findings help for management of P in arable soils.
Zitierstile
Harvard-Zitierstil: Shaheen, S., Wang, J., Baumann, K., Ahmed, A., Hsu, L., Liu, Y., et al. (2022) Stepwise redox changes alter the speciation and mobilization of phosphorus in hydromorphic soils, Chemosphere, 288, Article 132652. https://doi.org/10.1016/j.chemosphere.2021.132652
APA-Zitierstil: Shaheen, S., Wang, J., Baumann, K., Ahmed, A., Hsu, L., Liu, Y., Wang, S., Kuehn, O., Leinweber, P., & Rinklebe, J. (2022). Stepwise redox changes alter the speciation and mobilization of phosphorus in hydromorphic soils. Chemosphere. 288, Article 132652. https://doi.org/10.1016/j.chemosphere.2021.132652
Schlagwörter
GOETHITE; Hydromorphic arable soils; Phosphorus loss; PHYTOAVAILABILITY; Quantum chemical calculations; Sustainable management
