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| 001 | 864358 | ||
| 005 | 20210130002530.0 | ||
| 024 | 7 | _ | |a 10.1016/j.geoderma.2018.11.034 |2 doi |
| 024 | 7 | _ | |a 0016-7061 |2 ISSN |
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| 100 | 1 | _ | |a Baumann, Karen |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Biological soil crusts as key player in biogeochemical P cycling during pedogenesis of sandy substrate |
| 260 | _ | _ | |a Amsterdam [u.a.] |c 2019 |b Elsevier Science |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Little is known about phosphorus (P) in biological soil crusts (BSCs) and their role in biogeochemical P cycling. The present study evaluated P in BSCs with an array of methodological approaches including sequential P fractionation, solution 31P nuclear magnetic resonance (NMR) spectroscopy, synchrotron-based P K-edge X-ray absorption near-edge structure (XANES) spectroscopy, elemental mapping (μ-XRF) combined with μ-XANES and P-lipid quantification. BSCs (light algal crusts) were collected at seven sites along a sediment weathering gradient in north-eastern Germany (based on feldspar weathering indices) from non-weathered dune sands at the Baltic Sea coast to more strongly weathered Weichselian glacio-fluvial sands near Berlin. The total P (Pt) concentrations of BSCs ranged from 93 to 389 mg kg−1 and were not significantly correlated with the change in feldspar weathering index. While concentrations of stable P (H2SO4-extractable) strongly decreased, labile P (resin- + NaHCO3-extractable P) in BSCs increased with increasing sediment weathering. Based on 31P NMR spectra, 20 to 62% of NaOH-EDTA extracted P was orthophosphate monoesters and 0 to 9% was diesters. For BSCs, P K-edge XANES showed that Ca-P species decreased with increasing weathering. Heterogeneity of the BSCs was exemplarily shown at the micrometre scale by element mapping μ-XRF and μ-XANES, using four 10 × 10 μm spots of a vertical cross-section within a coastal dune BSC. While only the P-lipid class phosphatidic acid (PA) increased with increasing weathering, analyses of BSC phospholipid fatty acids (PLFAs) revealed decreasing contributions of Gram-positive bacteria with increasing coastal sediment weathering but different taxa were independent of any investigated P parameter. Proportions of lipid-P varied between 0.02 and 0.1% of Pt, indicating a constant share of living biomass in BSCs along the gradient. In conclusion, this multi-method study of P speciation in BSCs showed that these communities play a key role in the biogeochemical P cycle, especially by transforming stable P into labile, easily bioavailable P. |
| 536 | _ | _ | |a 255 - Terrestrial Systems: From Observation to Prediction (POF3-255) |0 G:(DE-HGF)POF3-255 |c POF3-255 |f POF III |x 0 |
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| 700 | 1 | _ | |a Siebers, Meike |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Kruse, Jens |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a Eckhardt, Kai-Uwe |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Hu, Yongfeng |0 0000-0002-7510-9444 |b 4 |
| 700 | 1 | _ | |a Michalik, Dirk |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Siebers, Nina |0 P:(DE-Juel1)164361 |b 6 |
| 700 | 1 | _ | |a Kar, Gourango |0 P:(DE-HGF)0 |b 7 |
| 700 | 1 | _ | |a Karsten, Ulf |0 P:(DE-HGF)0 |b 8 |
| 700 | 1 | _ | |a Leinweber, Peter |0 P:(DE-HGF)0 |b 9 |
| 773 | _ | _ | |a 10.1016/j.geoderma.2018.11.034 |g Vol. 338, p. 145 - 158 |0 PERI:(DE-600)2001729-7 |p 145 - 158 |t Geoderma |v 338 |y 2019 |x 0016-7061 |
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