Schwerpunktprogramm (SPP) 1685: Ecosystem nutrition: forest strategies for limited phosphorus resources; Ökosystemernährung: Forststrategien zum Umgang mit limitierten Phosphor-Ressourcen, Microbial P mobilization and immobilization in the rhizosphere and root-free soil (SPP: P Nutrition & recycling)

Description: Soil microorganisms can mobilize and immobilize phosphorus (P), and therefore strongly affect the availability of P to plants. In this project we hypothesize that the ratio of labile P to microbial P increases during the transition from acquiring to recycling ecosystems. Microbial and plant P uptake will be studied with 33P that will be quantified in microbial and plant biomass as well as in lipids. To what extent microorganisms immobilize and mobilize P during decomposition of soil organic matter will be explored with a 14C/33P labeled monoester. Seasonal dynamics of actual and potential P mineralization (33P dilution and phosphatase activity), and microbial P immobilization will be studied with soils of the transition from acquiring to recycling ecosystems. The contribution of litter-derived P will be explored in a litter exclusion experiment in the field. Spatial patterns of microbial and plant P mineralization in the rhizosphere will be explored by analyses of areas of high acid and alkaline (=microbial-derived) phosphatase activity by soil zymography, and their relations with areas of high rhizodeposition (14C imaging). In conclusion, we will analyse mechanisms of actual and potential microbial P mineralization and immobilization, localization, and consequences for P uptake by plants.

SupportProgram

Tags: Lipid ? Recycling ? Waldressourcen ? Humus ? Phosphor ? Bodenmikroorganismen ? Recyclingquote ? Rhizosphäre ? Siedlungsabfall ? Wirkung ? Pflanzenwurzel ? Bodenökosystem ? Bodenuntersuchung ? Phytomasse ? Recyclingpotenzial ? Mikroorganismen ? Säure ? Boden ? Verwitterung ? Biologische Aktivität ? Ernährung ? Gebiet ? Ökosystem ? DEMOBILISIERUNG ? STARK ? VERHAELTNIS ? Verdünnung ? Vermehrung ? EXPERIMENT ? FREI ? MECHANISMEN ? Bepflanzung ? Mineralisation ? Ortsbestimmung ? POTENZIAL ? PROJEKT ?

Region: Bayern Bayern

Bounding boxes: 8.980116870810098° .. 13.839424358777723° x 47.27036232638313° .. 50.564452934875554°

License: Creative Commons Namensnennung-keine Bearbeitung-Nichtkommerziell 4.0

Language: Englisch/English

Organisations

• Deutsche Forschungsgemeinschaft (Finanzielle Förderung)
• Umweltbundesamt (Bereitstellung)
• Universität Bayreuth, Fachgruppe Geowissenschaften, Bayreuther Zentrum für Ökologie und Umweltforschung (BayCEER), Lehrstuhl für Bodenökologie (Projektverantwortung)
• Universität Göttingen, Büsgen-Institut, Abteilung Ökopedologie der gemäßigten Zonen (Mitwirkung)

Last harvest: 28.09.2026 00:09

Time ranges: 2013-01-01 - 2026-10-25

Status

Aktiv

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