Thin ferrihydrite sediment capping sequestrates phosphorus experiencing redox conditions in a shallow temperate lacustrine wetland
文献类型：期刊论文
| 作者 | Y. C. Zou, M. R. Grace, K. L. Roberts and X. F. Yu |
| 刊名 | Chemosphere
 |
| 出版日期 | 2017 |
| 卷号 | 185页码:673-680 |
| 通讯作者 | 于晓菲 |
| 中文摘要 | Synthesized ferrihydrite (Fh) with the dosages of 0.3, 0.6 and 0.9 cm thickness (labeled as Fh, 2Fh and 3Fh respectively, equivalent to 248-774 g/m(2)) were deployed to serve as the reactive capping layer covering the Ornamental Lake sediments, the Royal Botanic Garden of Melbourne. The sediments were exposed to an alternating regime of oxic/anoxic conditions using laboratory reactors for 45 days. Dynamics of disSolved oxygen (DO), pH, filterable reactive phosphorus (FRP), filterable ammonium (NHS'), nitrate and nitrite (NOx), total dissolved nitrogen (TDN) and dissolved iron (Fe) of overlying water were examined. After incubation, O-2 and H2S profiles across the water-sediment interface were observed with microelectrodes. The element distributions in the upper sediments were tested as well. Results showed that DO and pH kept relatively stable during oxic period, while decreased significantly during anoxic period. Fh cappings decreased both DO and pH, and inhibited the release of FRP. No significant increments of FRP in overlying waters were observedduring anoxic period. Fh cappings prompted the releases of NH4+ and TDN, while inhibited that of NO(x center dot)NH(4)(+)increased while NOx decreased during anoxic period. Fe(II) and TFe increased only in 3Fh, especially during anoxic conditions. Fh cappings increased O-2 and H2S concentrations across the water-sediment interfaces. TP and TN in the sediments decreased after capping, while TFe increased significantly. We concluded that 0.6 cm thickness of (496 g/m(2)) Fh capping could sequestrate P, even experiencing redox conditions. (C) 2017 Elsevier Ltd. All rights reserved. |
| WOS记录号 | WOS:000408597300077 |
| 源URL | [http://ir.iga.ac.cn/handle/131322/7566]  |
| 专题 | 东北地理与农业生态研究所_湿地与全球变化学科组 |
| 推荐引用方式 GB/T 7714 | Y. C. Zou, M. R. Grace, K. L. Roberts and X. F. Yu. Thin ferrihydrite sediment capping sequestrates phosphorus experiencing redox conditions in a shallow temperate lacustrine wetland[J]. Chemosphere,2017,185:673-680. |
| APA | Y. C. Zou, M. R. Grace, K. L. Roberts and X. F. Yu.(2017).Thin ferrihydrite sediment capping sequestrates phosphorus experiencing redox conditions in a shallow temperate lacustrine wetland.Chemosphere,185,673-680. |
| MLA | Y. C. Zou, M. R. Grace, K. L. Roberts and X. F. Yu."Thin ferrihydrite sediment capping sequestrates phosphorus experiencing redox conditions in a shallow temperate lacustrine wetland".Chemosphere 185(2017):673-680. |
入库方式： OAI收割
来源：东北地理与农业生态研究所
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