Rhizodeposition is the main source of carbon and energy for nutrient mobilization in subsoil

DFG KU 1184/21
FOR 1320

From 03/2010 to 02/2015

Principal Investigator: Guido L.B. Wiesenberg, Yakov Kuzyakov
Staff: Silke Hafner

Rhizodeposition is a very important source of carbon (C) and energy for microorganisms mobilizing nutrients in soil, but no data is available regarding the importance of rhizodeposition in subsoil. This project aims on the estimation of C input into subsoil, tracing the root-derived C in biopores formed by roots and earthworms, calculation of the budget of root-derived C and its contribution to nutrient mobilization in subsoil. Plants with different root systems (chicory and alfalfa) will be labeled in field by 13CO2 and under controlled conditions by 13C and 14C. Subsequently, the C budget will be followed by both isotopes including incorporation into microbial molecular markers (13C-PLFA) and biopore coatings. Rhizosphere extension in the subsoil will be estimated by analyzing distribution profiles of root-derived C (14C) and depletion of N (15N), P (33P), and K, depending on distance to root and along individual roots (by 14C phosphor-imaging). Availability of nutrients (N, P) in subsoil and biopores and nutrient mobilization by root exudates will be tested in batch experiments. An approach to evaluate the origin of individual biopores will be developed based on composition of lipid biomarkers. The subproject will deliver parameters for modeling of C flow within and into the subsoil, rhizosphere extension, diffusion profiles of nutrients and root exudates, and nutrient availability depending on distance to roots.

 

DFG funding ID 135946177



Upcoming ...

Fr. 2020-07-10 now
12th BayCEER Workshop 2020: "Call for Abstracts" is open
BayCEER Colloquium:
Th. 2020-07-16
Verschoben auf WS 2020/21! Investigating communal pathogen defense and its role in social evolution
Th. 2020-10-22
Extreme redox oscillations in freshwater re-flooded acid sulfate soil wetlands: Effects on Fe, S, and trace metals geochemical behavior
Ecological-Botanical Garden:
We. 2020-07-01 now
Alle Termine im Juli 2020 entfallen!
Fr. 2020-07-03 now
Gewächshäuser ab sofort wieder geöffnet!
BayCEER Blog
13.01.2020
Why Science Communication?
24.05.2019
Stoichiometric controls of C and N cycling
07.05.2019
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
07.05.2019
EGU – interesting research and free coffee
RSS Blog as RSS Feed
Weather research site
Luftdruck (356m): 981.4 hPa
Lufttemperatur: 12.1 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 2.9 km/h
Wind (Max.): 5.0 km/h
Windrichtung: S

...more
Globalstrahlung: -6 W/m²
Lufttemperatur: 11.0 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 8 h/d
Wind (Höhe 32m): 10.1 km/h

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