Phosphorus speciation in surface sediments of a hypertrophic lake, Southwestern China: insights from fractionation and 31P NMR
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- 作者：Runyu Zhang ; Liying Wang ; Fengchang Wu
- 关键词：Sediment ; Phosphorus ; Bioavailability ; Eutrophication ; 31P NMR
- 刊名：Chinese Journal of Geochemistry
- 出版年：2015
- 出版时间：June 2015
- 年：2015
- 卷：34
- 期：2
- 页码：167-176
- 全文大小：761 KB
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Ruban V, - 作者单位：Runyu Zhang (1) (2)
Liying Wang (1)
Fengchang Wu (3)
1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Mianyang, 621010, China
3. Chinese Research Academy of Environmental Sciences, Beijing, 100012, China - 刊物主题：Geochemistry;
- 出版者：SP Science Press
- ISSN：1993-0364
文摘
Phosphorus (P) species in surface sediments from a shallow, hypertrophic lake, Lake Dianchi, China, were investigated by P fractionation and 31P nuclear magnetic resonance (NMR) spectroscopy during a regional algal bloom. In addition, their potential contributions to the overlying water were also evaluated. Labile fractions of P extracted by NH4Cl, bicarbonate dithionite and NaOH ranged from 340.6 to 1,725.8?mg?kg?, accounting for 20.5?%-7.2?% of the total P. A two-step extraction method refinement of P recovery was performed before the 31P NMR analysis. Recovery rates of sedimentary TP and organic P, by combining EDTA pretreatment and NaOH or mixed reagents, ranged from 31.8?% to 69.3?% and from 19.8?% to 51.7?%. 31P NMR results showed that ortho-P and monoester-P were the most abundant P components in the sediment extractable P of sediments, followed by diester-P and pyro-P. Spatial distribution of the sum of ortho-P, diester-P and pyro-P detected by 31P NMR corresponded well with the labile P concentration determined by fractionation. Both exhibited a significant positive correlation with the total P in the water column, suggesting that internal loading may be an important source of P for the lake ecosystem. Biogenic P other than ortho-P may contribute to phytoplankton growth, with the relative proportion being 4.4?%-8.7?%. The release of labile P fractions fueled algal bloom, and the decay of organic matter, following the bloom events, consumed oxygen and elevated the pH value. This co-dependence might lead to a vicious cycle. Transformation mechanisms of various P species remain ambiguous and are worthy of further investigation.