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Phosphorus Speciation in Long-Term Drained and Rewetted Peatlands of Northern Germany

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Faculty of Agriculture and Environmental Sciences, University of Rostock, Justus-von-Liebig-Weg 6, 18051 Rostock, Germany
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Institute of Chemistry, University of Rostock, Albert-Einstein-Straße 3a, 18059 Rostock, Germany
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Leibniz Institute for Catalysis, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
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Synchrotron Light Research Institute, Muang District, 111 Moo 6, University Avenue, Nakhon Ratchasima 30000, Thailand
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University of Rostock, Interdisciplinary Faculty, Department Life, Light and Matter, Albert-Einstein Str. 25, 18051 Rostock, Germany
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Author to whom correspondence should be addressed.
Soil Syst. 2020, 4(1), 11; https://doi.org/10.3390/soilsystems4010011
Received: 29 November 2019 / Revised: 22 January 2020 / Accepted: 5 February 2020 / Published: 10 February 2020
Previous studies, conducted at the inception of rewetting degraded peatlands, reported that rewetting increased phosphorus (P) mobilization but long-term effects of rewetting on the soil P status are unknown. The objectives of this study were to (i) characterize P in the surface and subsurface horizons of long-term drained and rewetted percolation mires, forest, and coastal peatlands and (ii) examine the influence of drainage and rewetting on P speciation and distributions using wet-chemical and advanced spectroscopic analyses. The total P was significantly (p < 0.05) different at the surface horizons. The total concentration of P ranged from 1022 to 2320 mg kg−1 in the surface horizons and decreased by a factor of two to five to the deepest horizons. Results of the chemical, solution 31P nuclear magnetic resonance (NMR), and P K-edge X-ray absorption near-edge structure (XANES) indicated that the major proportions of total P were organic P (Po). In the same peatland types, the relative proportions of Po and stable P fractions were lower in the drained than in the rewetted peatland. The results indicate that long-term rewetting not only locks P in organic matter but also transforms labile P to stable P fractions at the surface horizons of the different peatland types. View Full-Text
Keywords: Hedley sequential fractionation; inorganic phosphorus; organic phosphorus; P K XANES; phosphorus fractions; solution 31P NMR Hedley sequential fractionation; inorganic phosphorus; organic phosphorus; P K XANES; phosphorus fractions; solution 31P NMR
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Negassa, W.; Michalik, D.; Klysubun, W.; Leinweber, P. Phosphorus Speciation in Long-Term Drained and Rewetted Peatlands of Northern Germany. Soil Syst. 2020, 4, 11.

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