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How do inundation provoke the release of phosphorus in soil-originated sediment due to nitrogen reduction after reclaiming lake from polder

引用

Journal of Environmental Sciences 2022年第8期34卷 147-157页

作者： Hezhong Yuan Bingchan Jia JuanWu 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 EngineeringNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Gaochun District Water Authority Bureau Nanjing 211300China College of Geography and Environment Shandong Normal UniversityJi’nan 250359China Department of Soil Science University of Wisconsin-MadisonMadison 53706USA

Different N and p fractions inmicrocosm incubation experiment was measured using highresolution in-situ peeper and DGT techniques combining with sequential extraction *** results showed the synchronous desorption and release of pO_(4)^(3-),S^(2-)and Fe^(2+)from the solid soil-originated *** trend indicated that the significant reduction of Fe-p and SO_(4)^(2-) occurred in the pore water during the *** concentrations of pO_(4)^(3-) in the overlying water and pore water increased to more than 0.1 and 0.2 mg/L at the beginning of the incubation *** NO_(3)^(-) concentrations from more than 1.5 mg/L to less than 0.5 mg/L combining with increasing NH^(4+) concentrations from less than 1mg/L tomore than 5 mg/L suggested the remarkable NO_(3)-reduction via dissimilatory nitrate reduction to ammonia(DNRA)pathway over *** NH^(4+) concentrations in the pore water aggravated the release of Fe^(2+) through reduction of Fe(Ⅲ)-p as electric acceptors under anaerobic *** process further stimulated the remarkable releasing of labile pO_(4)^(3-) from the solid phase to the solution and potential diffusion into overlying ***,high S^(2-) concentration at deeper layer indicated the reduction and releasing of S^(2-)from oxidation states,which can stimulated the NO_(3)^(-)reduction and the accumulation of NH^(4+)in the pore *** process can also provoke the reduction of Fe-p as electric acceptors following the release of labile pO_(4)^(3-)into pore ***,inundation potentially facilitate the desorption of labile p and attention should be paid during the reclaiming lake from polder.

关键词： Reclaiming lake from polder p release NO3-reduction Fe2+ Microcosmic incubation Experiment peeper and DGT peeper and DGT

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