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Article

A Dual Source of Phosphorus to Lake Sediments Indicated by Distribution, Content, and Speciation: Inle Lake (Southern Shan State, Myanmar)

1
Department of Physics, University of Mandalay, 73 Street, 05032 Mandalay, Myanmar
2
Department of Earth and Environmental Sciences, University of Pavia, Via Ferrata 9, I-27100 Pavia, Italy
3
Earth Sciences Department, University of Pisa, Via Santa Maria 53, 56126 Pisa, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(7), 1993; https://doi.org/10.3390/w12071993
Received: 12 June 2020 / Revised: 7 July 2020 / Accepted: 9 July 2020 / Published: 14 July 2020
(This article belongs to the Special Issue Geochemistry of Water and Sediment)
In this study, grab and core sediments from Inle lake were collected and analysed for their water and organic matter (O.M.) contents. Total phosphorus (TPSMT) and P fractions, namely inorganic-P (IP), organic-P (OP), P bound to Al, Fe and Mn oxy-hydroxides (Fe-P), and calcium-bound P (Ca-P) were determined by a sequential extraction procedure. TPSMT varied considerably (152–1980 mg/kg), with minimum concentrations detected at sites away from the main inflow rivers and maximum concentrations in the floating gardens area. In core sediments, TPSMT concentrations tended to decrease with depth, reaching values of <100 mg/kg. Concerning P forms, the overall abundance sequence in grab sediments was IP >> OP and Ca-P ≥ OP > Fe-P, whereas in core sediments it showed marked differences with depth and between sites. The relative abundance of the inorganic species (Ca-P, Fe-P) was controlled by the mineralogy of the sediments. While the TPSMT distribution pointed to an increased anthropogenic input, the relative abundance of P species provided information on the P origin, incorporation processes, and evolution over time. This information, combined with chemical and mineralogical data, permitted to identify two different P sources: the agricultural input in the floating gardens area and the detrital input related to soil erosion. View Full-Text
Keywords: wetland; cultural eutrophication; sequential extractions; organic matter; endogenic Calcite; soil erosion wetland; cultural eutrophication; sequential extractions; organic matter; endogenic Calcite; soil erosion
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MDPI and ACS Style

Thin, M.M.; Sacchi, E.; Setti, M.; Re, V. A Dual Source of Phosphorus to Lake Sediments Indicated by Distribution, Content, and Speciation: Inle Lake (Southern Shan State, Myanmar). Water 2020, 12, 1993. https://doi.org/10.3390/w12071993

AMA Style

Thin MM, Sacchi E, Setti M, Re V. A Dual Source of Phosphorus to Lake Sediments Indicated by Distribution, Content, and Speciation: Inle Lake (Southern Shan State, Myanmar). Water. 2020; 12(7):1993. https://doi.org/10.3390/w12071993

Chicago/Turabian Style

Thin, Myat Mon, Elisa Sacchi, Massimo Setti, and Viviana Re. 2020. "A Dual Source of Phosphorus to Lake Sediments Indicated by Distribution, Content, and Speciation: Inle Lake (Southern Shan State, Myanmar)" Water 12, no. 7: 1993. https://doi.org/10.3390/w12071993

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