https://scholars.lib.ntu.edu.tw/handle/123456789/606035
標題: | Soil acidification enhances the mobilization of phosphorus under anoxic conditions in an agricultural soil: Investigating the potential for loss of phosphorus to water and the associated environmental risk | 作者: | Zhang S Yang X Hsu L.-C Liu Y.-T SHAN-LI WANG White J.R Shaheen S.M Chen Q Rinklebe J. |
關鍵字: | Diffuse P pollution loss;Eutrophication;Fe-Mn reduction;Redox dynamic changes;Soil acidification;Acidification;Agriculture;Binary alloys;Dissolution;Iron alloys;Iron oxides;Phosphorus;Redox reactions;Soil pollution;Water pollution;X ray absorption;Acidic soils;Agricultural soils;Anoxic conditions;Environmental risks;Fe reductions;Fe-mn reduction;Mobilisation;Redox dynamic change;Soil acidifications;Soils;aluminum oxide;calcium carbonate;calcium oxide;carbon;dissolved organic matter;ferric hydroxide;inorganic compound;iron oxide;magnesium oxide;manganese oxide;phosphorus;phosphorus pentoxide;water;acidification;agricultural soil;anoxic conditions;diffusion;dissolved inorganic carbon;dissolved organic carbon;environmental risk;eutrophication;mobilization;pH;redox conditions;reduction;speciation (chemistry);agriculture;anoxic condition;Article;concentration (parameter);controlled study;correlation analysis;dissolution;enhanced biological phosphorus removal;environmental impact;environmental parameters;fractionation;geochemical analysis;reduction (chemistry);soil acidification;species differentiation;spectroscopy;water supply;X ray absorption near edge structure spectroscopy;soil;soil pollutant;Hydrogen-Ion Concentration;Soil;Soil Pollutants;Water | 公開日期: | 2021 | 卷: | 793 | 來源出版物: | Science of the Total Environment | 摘要: | Soil redox potential (EH) and pH are key parameters regulating the solubility and fate of phosphorus (P). However, the impact of soil acidification on the redox-induced mobilization and speciation of P in soils under a wide range of EH values has not been extensively studied. Here, we investigated the mobilization and speciation of P in an acidified agricultural soil at two different pH values (e.g., highly acidic soil; pH = 5.6 and slightly acidic soil; pH = 6.1) compared to the un-acidified soil (control soil; pH = 7.3) under a wide range of EH condition (+459 to ?281 mV). The impacts of EH/pH-dependent changes of Fe-Mn oxides, and dissolved organic (DOC) and inorganic (DIC) carbon on P mobilization and speciation were also investigated using geochemical and spectroscopic (X-ray absorption near edge structure) techniques. The concentrations of dissolved P under anoxic conditions increased up to 69.3% in the highly acidic soil compared with the control soil. The decrease of the Fe-P fraction, the decrease of Ferrihydrite-Pads speciation, and the strong linear correlation between the dissolved P and Fe2+ (R2 > 0.85) supports the finding that enhanced P mobilization under anoxic conditions may be attributed to Fe reduction in the highly acidic soil. The concentration of dissolved Fe and P remained low until pH dropped below 6.35 for P and 6.28 for Fe, while a liner increase was found in dissolved Mn accompanying a general trend of pH decrease. This result suggests that the dissolution of reducible Mn under acidic soil conditions was an important factor for enhancing mobilization of dissolved P under anoxic conditions. This trend was due to the low amount of Mn, indirectly speeding up Fe reduction. These results can help to develop management practices to effectively mitigate P export and protect water resources from diffuse P pollution. ? 2021 |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85108420065&doi=10.1016%2fj.scitotenv.2021.148531&partnerID=40&md5=5e456b41360b9f50ed3927e52ee8f857 https://scholars.lib.ntu.edu.tw/handle/123456789/606035 |
ISSN: | 00489697 | DOI: | 10.1016/j.scitotenv.2021.148531 |
顯示於: | 農業化學系 |
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