RCEES OpenIR  > 城市与区域生态国家重点实验室
Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed
Mihiranga, H. K. M.; Jiang, Yan; Li, Xuyong; Wang, Wei; De Silva, Koshila; Kumwimba, Mathieu Nsenga; Bao, Xin; Nissanka, S. P.
2021-12-15
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume790Pages:-
AbstractEutrophication in freshwater environments may be enhanced by the elevation of sulfate in waters, through the release of internal phosphorus (P) from anoxic sediments. However, the influence of increasing but modest sulfate concentrations (less than 3000 mu M) on P release under oxic conditions across the sediment-water interface (SWI) in eutrophic freshwater is poorly understood. In this study, the profiles of P, iron (Fe), sulfur (S) and physicochemical parameters were measured in a simulated lacustrine system with varying concentrations of sulfate (970-2600 mu M) in overlying water. The results indicated that elevated concentrations of sulfate increased the soluble reactive Pin overlying waters under oxic conditions across the SWI. A 100 mu M increase of sulfate was found to induce a 0.128 mgm-2d-1 increase of P flux from surface sediments into overlying waters under oxic conditions. Higher sulfate concentrations in the overlying waters increased the concentrations of labile S(-II) in the deep sediments, due to sulfate penetration and subsequent reduction to S(-II). We also found the fluxes of labile Fe (10.34 to 18.33 mgm-2d-1) and P (2.70 to 1.33 mgm-2d-1) from deep to surface sediment were both positive and greater than the corresponding fluxes (Fe, 2.2 to 3.51 and P, 2.6 to 0.39 mgm-2d-1, respectively) from surface sediment to the overlying water, suggesting that reduction of P-bearing Fe(III)(oxyhydr)oxides in deep anoxic sediment acted as a major source of internal P release. In addition, the upward flux of Fe(II) was significantly lower under higher sulfate conditions, indicating that the Fe(II) flux could be mitigated by formation of Fe(II) sulfides in the deep sediment. Under these conditions, less Fe(II) from deep sediments could be re-oxidized and combine with Pin the surface, oxic sediment, thereby reducing the retention capacity for P and leading to higher release of internal P to the water column. (c) 2021 Elsevier B.V. All rights reserved.
Department城市与区域生态国家重点实验室
KeywordEutrophication Internal P loading Sulfate Freshwater DGT
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46746
Collection城市与区域生态国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Lubumbashi, Fac Agron, Lubumbashi, DEM REP CONGO
4.Univ Peradeniya, Fac Agr, Dept Crop Sci, Peradeniya, Sri Lanka
Recommended Citation
GB/T 7714
Mihiranga, H. K. M.,Jiang, Yan,Li, Xuyong,et al. Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,790:-.
APA Mihiranga, H. K. M..,Jiang, Yan.,Li, Xuyong.,Wang, Wei.,De Silva, Koshila.,...&Nissanka, S. P..(2021).Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed.SCIENCE OF THE TOTAL ENVIRONMENT,790,-.
MLA Mihiranga, H. K. M.,et al."Nitrogen/phosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed".SCIENCE OF THE TOTAL ENVIRONMENT 790(2021):-.
Files in This Item: Download All
File Name/Size DocType Version Access License
Nitrogenphosphorus b(1955KB)期刊论文出版稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Mihiranga, H. K. M.]'s Articles
[Jiang, Yan]'s Articles
[Li, Xuyong]'s Articles
Baidu academic
Similar articles in Baidu academic
[Mihiranga, H. K. M.]'s Articles
[Jiang, Yan]'s Articles
[Li, Xuyong]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Mihiranga, H. K. M.]'s Articles
[Jiang, Yan]'s Articles
[Li, Xuyong]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Nitrogenphosphorus behavior traits and implications during storm events in a semi-arid mountainous watershed.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.