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Minor contribution of leaf litter to N nutrition of beech (Fagus sylvatica) seedlings in a mountainous beech forest of Southern Germany |
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| Authors: | Chanjuan Guo Judy Simon Rainer Gasche Pascale Sarah Naumann Carolin Bimüller Rodica Pena Andrea Polle Ingrid Kögel-Knabner Bernd Zeller Heinz Rennenberg Michael Dannenmann |
| Affiliation: | 1. Institute of Forest Botany and Tree Physiology, Chair of Tree Physiology, University of Freiburg, Georges-Koehler-Allee 53/54, 79110, Freiburg, Germany 2. Institute for Meteorology and Climate Research, Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), Kreuzeckbahnstrasse 19, 82467, Garmisch-Partenkirchen, Germany 3. Lehrstuhl für Bodenkunde, Department für ?kologie und ?kosystemmanagement, Wissenschaftszentrum Weihenstephan. Technische Universit?t München, 85350, Freising-Weihenstephan, Germany 4. Abteilung Forstbotanik und Baumphysiologie, Büsgen-Institut, Büsgenweg 2, Georg-August Universit?t G?ttingen, 37077, G?ttingen, Germany 5. IAS-Institute for Advanced Study, Technische Universit?t München, Lichtenbergstra?e 2a, 85748, Garching, Germany 6. INRA Centre de Nancy, UR 1138, Biogéochimie des Ecosystèmes Forestiers, 54280, 16 Champenoux, France 7. King Saud University, PO Box 2454, Riyadh, 11451, Saudi Arabia |
| Abstract: | AimsOur aims were to characterize the fate of leaf-litter-derived nitrogen in the plant-soil-microbe system of a temperate beech forest of Southern Germany and to identify its importance for N nutrition of beech seedlings.Methods15N-labelled leaf litter was traced in situ into abiotic and biotic N pools in mineral soil as well as into beech seedlings and mycorrhizal root tips over three growing seasons.ResultsThere was a rapid transfer of 15N into the mineral soil already 21 days after tracer application with soil microbial biomass initially representing the dominant litter-N sink. However, 15N recovery in non-extractable soil N pools strongly increased over time and subsequently became the dominant 15N sink. Recovery in plant biomass accounted for only 0.025 % of 15N excess after 876 days. After three growing seasons, 15N excess recovery was characterized by the following sequence: non-extractable soil N?>>?extractable soil N including microbial biomass?>>?plant biomass?>?ectomycorrhizal root tips.ConclusionsAfter quick vertical dislocation and cycling through microbial N pools, there was a rapid stabilization of leaf-litter-derived N in non-extractable N pools of the mineral soil. Very low 15N recovery in beech seedlings suggests a high importance of other N sources such as root litter for N nutrition of beech understorey. |
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