Abstract In this study, the effects of short-term aerobic conditions on phosphorus (P) mobility in sediment were investigated in the eutrophic lakes. To accomplish this, an indoor cultivation system was established and short-term cultivation (3, 8 and 15 days) was conducted under control and aerobic treatments. High-resolution diffusive gradients in thin films (DGT) and dialysis (HR-Peeper) techniques were used to determine the mobility patterns of P in sediments. The results showed that: (1) Aerobic treatment significantly increased oxygen concentrations (maximum 17.1%) in overlying water within 15 days, with no significant effects on sediment oxygen penetration depth or redox potential. Additionally, aerobic treatment inhibited soluble reactive phosphorus (SRP) and DGT-labile P release from sediment to overlying water. (2) Aerobic treatment decreased the pore water SRP and soluble Fe(II) on day 3 with no impact on sediment SRP/DGT-labile P and soluble/DGT-labile Fe on day 8 and 15. (3) Model simulation using DGT Induced Fluxes in Sediments (DIFS) showed that the pore water SRP replenishment ability of sediment particle P was lower in the aerobic group than the control group, and the sediment system equilibration time was elongated after pore water SRP decreased in the aerobic group on day 3. (4) On day 3, SRP and soluble Fe(II), DGT-labile P and DGT-labile Fe showed significant positive correlations (r > 0.888, p < 0.001), indicating that reduced pore water SRP concentration was related to decreased pore water soluble Fe(II).

中文翻译：

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短期有氧条件对沉积物中磷迁移率的影响

摘要 本研究考察了富营养化湖泊短期好氧条件对沉积物中磷（P）迁移率的影响。为此，建立了室内栽培系统，并在控制和需氧处理下进行短期栽培（3、8 和 15 天）。薄膜中的高分辨率扩散梯度 (DGT) 和透析 (HR-Peeper) 技术用于确定沉积物中 P 的迁移模式。结果表明：（1）好氧处理在15 d内显着提高了上覆水中的氧浓度（最高17.1%），对沉积物氧渗透深度和氧化还原电位没有显着影响。此外，好氧处理抑制了可溶性活性磷 (SRP) 和 DGT 不稳定的磷从沉积物释放到上覆水体。