Journal article

Publication year: 2021

Journal: Chemosphere

Volume number: 275

ISSN: 0045-6535

eISSN: 1879-1298

DOI Link: https://doi.org/10.1016/j.chemosphere.2021.129928

Publisher: Elsevier

Abstract: 
Y Mobilization of phosphorus (P) in arable soils might be affected by groundwater fluctuations and the associated changes in redox potential (E-H). However, the impact of systematic changes of E-H on P mobilization in redoximorphic arable soils along a catena has not been studied so far. Therefore, we investigated P mobilization under different redox conditions in top- and sub-soil horizons of three groundwater affected arable soils along a slight slope (toe-, mid-, and upper-slope position) in Northern Germany using an automated biogeochemical microcosm system. The impact of pH, Al, Fe, Mn, and dissolved organic carbon (DOC) on P mobilization was also studied. The initial EH (+351 to +431 mV) and pH (6.5-7.0) decreased in all soil samples (E-H = 280 mV; pH = 4.4) when creating a slurry. Thereafter, the pH increased to 7.1 and 6.4 with increasing EH in the mid-and toe-slope soil, respectively. Concentrations of dissolved P ranged between 20.8 mg L-1 under low E-H in the toe slope topsoil and 0.69 mg L-1 under high E-H in the toe- and mid-slop subsoil. Concentrations (mg L-1) of dissolved Fe (0.31-13.3) and DOC (92-2651) increased under low EH and decreased under high EH. The increase of P mobilization under low EH and pH in the soils might be due to the release of P via the reductive and acidic dissolution of Fe-(oxhydr)oxides and/or due to soil organic matter mineralization. The high mobilization of P under reducing conditions may increase its bioavailability; however, it may increase its loss in the soils, particularly in the toe slope profile. (C) 2021 Elsevier Ltd. All rights reserved.

Harvard Citation style: Shaheen, S., Wang, J., Baumann, K., Wang, S., Leinweber, P. and Rinklebe, J. (2021) Redox-induced mobilization of phosphorus in groundwater affected arable soil profiles, Chemosphere, 275, Article 129928. https://doi.org/10.1016/j.chemosphere.2021.129928

APA Citation style: Shaheen, S., Wang, J., Baumann, K., Wang, S., Leinweber, P., & Rinklebe, J. (2021). Redox-induced mobilization of phosphorus in groundwater affected arable soil profiles. Chemosphere. 275, Article 129928. https://doi.org/10.1016/j.chemosphere.2021.129928