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.
BayCEER Colloquium: |
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Th. 2023-04-06 Human-Wildlife Conflicts (HWC) in Southern Africa |
Dialog: |
We. 2023-03-01 now Main FlussFilmFest 2023 |
Ecological-Botanical Garden: |
Su. 2023-04-02 Führung | Rosen-Seide & Soja-Kaschmir: Textilien von morgen |
Su. 2023-04-16 Führung | Den ÖBG kennenlernen: Allgemeine Gartenführung |
Su. 2023-04-16 Ausstellungseröffnung | Die dünne Haut der Erde - Unsere Böden. |