Microbial P mobilization and immobilization in rhizosphere and in root free soil

Break neu

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.

For further information, see:
Soil Science of Temperate and Boreal Ecosystems





Principal investigators:


Prof. Dr. Yakov Kuzyakov
Universität Göttingen
Ökopedologie der Gemäßigten Zonen
Büsgenweg 2
37077 Göttingen
Tel.: (+49) (0)551-399765


PhD student:


Dipl.-Geow. Thomas Zilla
Universität Göttigen
Soil Science of Temperate and Boreal Ecosystems
Büsgenweg 2
37077 Göttingen
Tel.: (+49) (0)551-3933521

Study sites


Bad Brückenau (BBR)

Conventwald (CON)

Lüss (LUE)

Mitterfels (MIT)

Vessertal (VES)

Tuttlingen (TUT)



Funded by


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Benutzerspezifische Werkzeuge