Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems
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Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems Andrei Rodionov . Sara L. Bauke . Christian von Sperber . Carmen Hoeschen . Ellen Kandeler . Jens Kruse . Hans Lewandowski . Sven Marhan . Carsten W. Mueller . Margaux Simon . Federica Tamburini . David Uhlig . Friedhelm von Blanckenburg . Friederike Lang . Wulf Amelung
Received: 1 February 2020 / Accepted: 28 August 2020 / Published online: 1 October 2020 Ó The Author(s) 2020
Abstract Tree roots penetrate the soil to several meters depth, but the role of subsoils for the supply of nutrient elements such as phosphorus (P) to the trees is poorly understood. Here, we tested the hypothesis that increased P deficiency in the topsoil results in an increased microbial recycling of P from the forest subsoil. We sampled soils from four German temperate forest sites representing a gradient in total P stocks. We analyzed the oxygen isotopic composition of HClextractable phosphate (d18OP) and identified
Responsible Editor: Edward Brzostek.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10533-020-00700-8) contains supplementary material, which is available to authorized users. A. Rodionov S. L. Bauke (&) C. von Sperber J. Kruse M. Simon W. Amelung Institute of Crop Science and Resource Conservation (INRES) – Soil Science and Soil Ecology, University of Bonn, Nussallee 13, 53115 Bonn, Germany e-mail: [email protected] A. Rodionov Soil Ecology, University of Bayreuth, Dr.-Hans-FrischStr. 1-3, 95448 Bayreuth, Germany C. von Sperber Department of Geography, McGill University, 805 Sherbrooke St. W., Montreal, QC H3A 0B9, Canada
differences in P speciation with increasing soil depth using X-ray absorption near-edge structure (XANES) spectroscopy. We further determined microbial oxygen demand with and without nutrient supply at different soil depths to analyse nutrient limitation of microbial growth and used nanoscale secondary ion mass spectrometry (NanoSIMS) to visualize spatial P gradients in the rhizosphere. We found that d18OP values in the topsoil of all sites were close to the isotopic signal imparted by biological cycling when oxygen isotopes in phosphate are exchanged by enzymatic activity. However, with increasing soil depth and increasing HCl-P concentrations, d18O values continuously decreased towards values expected for primary minerals in parent material at depths below 60 cm at sites with high subsoil P stocks
C. Hoeschen C. W. Mueller Chair of Soil Science, Department of Ecology and Ecosystem Management, Technical University of Munich, Emil-Ramann-Str. 2, 85350 Freising-Weihenstephan, Germany E. Kandeler S. Marhan Institute of Soil Science and Land Evaluation, Soil Biology Department, University of Hohenheim, EmilWolff-Str. 27, 70599 Stuttgart, Germany J. Kruse H. Lewandowski D. Uhlig W. Amelung Institute of Bio- and Geosciences – Agrosphere (IBG-3), Forschungszentrum Ju¨lich GmbH, Wilhelm-JohnenStraße, 52428 Ju¨lich,
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