Description: Das Projekt "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)" wird/wurde gefördert durch: Deutsche Forschungsgemeinschaft. Es wird/wurde ausgeführt durch: Universität Bayreuth, Fachgruppe Geowissenschaften, Bayreuther Zentrum für Ökologie und Umweltforschung (BayCEER), Lehrstuhl für Bodenökologie.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
Origin: /Bund/UBA/UFORDAT
Tags: Phosphorrückgewinnung ? Recycling ? Humus ? Lipid ? Phosphor ? Waldressourcen ? Pflanzenwurzel ? Bodenmikroorganismen ? Recyclingquote ? Rhizosphäre ? Siedlungsabfall ? Wirkung ? Bodenökosystem ? Bodenuntersuchung ? Mineralisation ? Phytomasse ? Recyclingpotenzial ? Verdünnung ? Mikroorganismen ? Säure ? Boden ? Verwitterung ? Biologische Aktivität ? Ernährung ? Ökosystem ? Gebiet ? DEMOBILISIERUNG ? STARK ? VERHAELTNIS ? Vermehrung ? EXPERIMENT ? FREI ? MECHANISMEN ? Ortsbestimmung ? Bepflanzung ? POTENZIAL ? PROJEKT ?
Region: Bayern
Bounding boxes: 12.53381° .. 12.53381° x 47.795° .. 47.795°
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2013-01-01 - 2025-04-25
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