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

DFG SP1389/4-1 im SPP 1685

From 10/2013 to 12/2016

Principal Investigator: Marie Spohn
Staff: Christine Heuck

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.

Homepage: https://www.ecosystem-nutrition.uni-freiburg.de/projekte/projekt_spohn

Upcoming ...

Fr. 2023-10-20
Forum Waldkontroversen
BayCEER Colloquium:
Th. 2023-10-19
Global change mycology: Towards understanding the role of climate for fruit body-forming fungal communities
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
Weather research site
Globalstrahlung: -2 W/m²
Lufttemperatur: 12.9 °C
Niederschlag: 0.1 mm/24h
Wind (Höhe 32m): 11.5 km/h

This site makes use of cookies More information