https://scholars.lib.ntu.edu.tw/handle/123456789/606036
標題: | Redox-induced mobilization of phosphorus in groundwater affected arable soil profiles | 作者: | Shaheen S.M Wang J Baumann K Wang S.-L Leinweber P Rinklebe J. SHAN-LI WANG |
關鍵字: | Governing factors;Phosphorus solubility;Redox chemistry;Redoximorphic soils;Agriculture;Biogeochemistry;Dissolution;Groundwater;Organic carbon;Phosphorus;Redox reactions;Soil surveys;Acidic dissolution;Dissolved organic carbon;Groundwater fluctuation;Microcosm system;Redox potentials;Reducing conditions;Soil organic matter mineralizations;Systematic changes;Soils;aluminum;ground water;iron;manganese;organic carbon;oxide;phosphorus;soil organic matter;sulfur;acidity;agricultural soil;dissolved organic carbon;groundwater;redox conditions;redox potential;soil horizon;soil profile;subsoil;topsoil;arable land;Article;bioavailability;Germany;microcosm;mineralization;mobilization;oxidation reduction reaction;pH;soil;soil depth;soil pollutant;Catena;Oxidation-Reduction;Soil;Soil Pollutants | 公開日期: | 2021 | 卷: | 275 | 來源出版物: | Chemosphere | 摘要: | Mobilization of phosphorus (P) in arable soils might be affected by groundwater fluctuations and the associated changes in redox potential (EH). However, the impact of systematic changes of EH 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 (EH = ?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 EH in the toe slope topsoil and 0.69 mg L?1 under high EH 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. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101563903&doi=10.1016%2fj.chemosphere.2021.129928&partnerID=40&md5=d668f8ad65c512b0e167e1dc5bb75b4c https://scholars.lib.ntu.edu.tw/handle/123456789/606036 |
ISSN: | 00456535 | DOI: | 10.1016/j.chemosphere.2021.129928 |
顯示於: | 農業化學系 |
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