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.
Fr. 2023-10-20 Forum Waldkontroversen |
BayCEER Colloquium: |
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Th. 2023-10-19 Global change mycology: Towards understanding the role of climate for fruit body-forming fungal communities |
Dialog: |
Fr. 2023-10-06 Forum Zukunftswald: Biotope im Wald für seltene und bedrohte Arten |
Ecological-Botanical Garden: |
Su. 2023-10-01 Führung | "Wilde Früchtchen: Essbares für Mensch und Tier" |
Vortragsreihe "Die dünne Haut der Erde": |
We. 2023-10-11 Mikroorganismen im Boden – Abbau von Mikroplastik und anderen Bodenverschmutzungen |