Phosphorus removal from sediments by Potamogeton crispus: New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention
文献类型：期刊论文
| 作者 | Yuan, Hezhong; Cai, Yiwei; Yang, Zhen; Li, Qiang; Liu, Enfeng; Yin, Hongbin |
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2021 |
| 卷号 | 109页码:181-192 |
| 英文摘要 | Macrophytes are usually chosen for phytoremediation tools to remove P in eutrophic aquatic ecosystems, but the lack of test methods hinders the understanding of removal mechanism and application. In this study, we used the novel technologies combined of Diffusive gradients in thin films (DGT), Planar optode (PO), and Non-invasive micro-test technology (NMT) to explore P dynamics in water-sediment continuum and rhizosphere of Potamogeton crispus over time. Results of the high-resolution in situ measurement showed that labile P(LPDGT) fluxes at the surficial sediment significantly decreased from approximate 120, 140, and 200 pg/ (cm(2).sec) via 30 days incubation period to 17, 40, and 56 pg/(cm(2).sec) via that of 15 days. Obvious synchronous increase of LPDGT was not detected in overlying water, suggesting the intense assimilation of dissolve reactive P via root over time. PO measurement indicated that O-2 concentration around the rhizosphere remarkably increased and radially diffused into deeper sediment until 100% saturation along with the root stretch downwards. NMT detection of roots showed the obvious O-2 inflow into root tissue with the uppermost flux of 30 pmol/(cm(2).sec) from surroundings via aerenchyma on different treatment conditions. Different from previous reports, gradually saturating O-2 concentrations around the rhizosphere was principally driven by O-2 penetration through interspace attributing to root stretch downward rather than root O-2 leakage. Increased O-2 concentrations in deep sediment over time finally induced the oxidization of labile Fe(II) into Fe(III) bound P and local P immobilization. (C) 2021 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 源URL | [http://159.226.73.51/handle/332005/20359]  |
| 专题 | 中国科学院南京地理与湖泊研究所 |
| 推荐引用方式 GB/T 7714 | Yuan, Hezhong,Cai, Yiwei,Yang, Zhen,et al. Phosphorus removal from sediments by Potamogeton crispus: New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2021,109:181-192. |
| APA | Yuan, Hezhong,Cai, Yiwei,Yang, Zhen,Li, Qiang,Liu, Enfeng,&Yin, Hongbin.(2021).Phosphorus removal from sediments by Potamogeton crispus: New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention.JOURNAL OF ENVIRONMENTAL SCIENCES,109,181-192. |
| MLA | Yuan, Hezhong,et al."Phosphorus removal from sediments by Potamogeton crispus: New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention".JOURNAL OF ENVIRONMENTAL SCIENCES 109(2021):181-192. |
入库方式： OAI收割
来源：南京地理与湖泊研究所
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