In situ, high-resolution evidence for iron-coupled mobilization of phosphorus in sediments

被引：125
作者：
Ding, Shiming [1 ]
Wang, Yan [1 ]
Wang, Dan [1 ]
Li, Yang Yang [1 ,2 ]
Gong, Mengdan [1 ]
Zhang, Chaosheng [3 ,4 ]
机构：
[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China
[2] Nanjing Univ Sci & Technil, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China
[3] Natl Univ Ireland, Ryan Inst, GIS Ctr, Galway, Ireland
[4] Natl Univ Ireland, Sch Geog & Archaeol, Galway, Ireland
来源：
SCIENTIFIC REPORTS | 2016年 / 6卷
基金：
中国国家自然科学基金; 英国工程与自然科学研究理事会;
关键词：
DISSOLVED REACTIVE PHOSPHORUS; THIN-FILMS TECHNIQUE; DIFFUSIVE GRADIENTS; LABILE PHOSPHORUS; PHOSPHATE RELEASE; SHALLOW LAKE; GREEN RUST; SOILS; WATER; GEL;
D O I：
10.1038/srep24341
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Reductive dissolution of phosphorus-bearing iron (Fe) (oxyhydr)oxides has been regarded as a primary mechanism responsible for the mobilization of phosphorus (P) in sediments for over 70 years. However, to date there is little in situ evidence to support this hypothesis. In this study, a total of 16 sites in the large eutrophic Lake Taihu were selected for investigation. Newly-developed diffusive gradients in thin films (ZrO-Chelex DGT) probes were deployed to simultaneously measure labile Fe and P mainly released from sediment solids at millimeter spatial resolution. Significantly positive correlations were observed between DGT-labile Fe and P at 14 sites, implying a release of P following reductive dissolution of Fe (oxyhydr) oxides. A coincident resupply of Fe(II) and P was observed from sediment solids to buffer their releases from DGT perturbance, further verifying the mechanism of Fe-coupled mobilization of P. The ratio of DGT-labile Fe/P was found to be positively correlated with the ratio of easily reducible (oxyhydr)oxide Fe to its associated P, indicating that this solid phase should retain P prior to its release. The results provide direct evidence for the coupling between Fe and P in sediments and further identify the easily reducible Fe (oxyhydr)oxide species involved in the coupling process.
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页数：11
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