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 ...


BayCEER Colloquium:
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.
Weather research site
Luftdruck (356m): 979.1 hPa
Lufttemperatur: 1.9 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 8.6 km/h
Wind (Max.): 24.1 km/h
Windrichtung: S

...more
Globalstrahlung: 1 W/m²
Lufttemperatur: 0.8 °C
Niederschlag: 0.0 mm/24h
Wind (Höhe 32m): 14.3 km/h

...more
This site makes use of cookies More information