Different N and P fractions in microcosm incubation experiment was measured using high-resolution in-situ Peeper and DGT techniques combining with sequential extraction pro-cedure.The results showed the synchronous desorption and release of PO43-,S2-and Fe2+from the solid soil-originated sediment.This trend indicated that the significant reduction of Fe-P and SO42-occurred in the pore water during the inundation.The concentrations of PO43-in the overlying water and pore water increased to more than 0.1 and 0.2 mg/L at the beginning of the incubation experiment.Decreased NO3concentrations from more than 1.5 mg/L to less than 0.5 mg/L combining with increasing NH4+concentrations from less than 1 mg/L to more than 5 mg/L suggested the remarkable NO3-reduction via dissimilatory nitrate reduction to ammonia(DNRA)pathway over time.High NH4+concentrations in the pore water aggravated the release of Fe2+through reduction of Fe(Ⅲ)-P as electric acceptors under anaerobic conditions.This process further stimulated the remarkable releasing of la-bile PO43-from the solid phase to the solution and potential diffusion into overlying water.Additionally,high S2-concentration at deeper layer indicated the reduction and releasing of S2-from oxidation states,which can stimulated the NO3-reduction and the accumulation of NH4+in the pore water.This process can also provoke the reduction of Fe-P as electric acceptors following the release of labile PO43-into pore water.Generally,inundation poten-tially facilitate the desorption of labile P and attention should be paid during the reclaiming lake from polder.

Hezhong Yuan;Bingchan Jia;Juan Wu;Haixiang Wang;Jianghua Yu;Yiwei Cai;Enfeng Liu;Qiang Li;Qingfei Zeng

Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET),School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Gaochun District Water Authority Bureau,Nanjing 211300,China;College of Geography and Environment,Shandong Normal University,Ji'nan 250359,China;Department of Soil Science,University of Wisconsin-Madison,Madison 53706,USA

环境科学学报（英文版）

[1]Hezhong Yuan;Bingchan Jia;Juan Wu;Haixiang Wang;Jianghua Yu;Yiwei Cai;Enfeng Liu;Qiang Li;Qingfei Zeng-.How do inundation provoke the release of phosphorus in soil-originated sediment due to nitrogen reduction after reclaiming lake from polder)[J].环境科学学报（英文版）,2022(08):147-157

polder,Fe2+from,NO3concentrations,NH4+concentrations,Fe2+through

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