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Rhizosphere priming: Quantifying plant impacts on carbon dioxide emissions from a warming Arctic

Objective

Rapid warming is accelerating Arctic carbon cycling, including CO2 release by degradation of thawing soil organic matter and CO2 uptake by better-growing plants. Projections of future Arctic greenhouse gas fluxes retain large uncertainties and do not consider plant-soil interactions that can substantially affect CO2 release - the RHIZOSPHERE PRIMING EFFECT. Theoretical considerations, comparison of ecosystem carbon stocks and model extrapolation of temperate studies suggest a high potential for globally-relevant, priming-induced CO2 emissions from a warming Arctic following shifts in vegetation and rooting patterns.

PRIMETIME aims to provide the first observation-based estimate of total plant effects on circum-Arctic soil and ecosystem carbon stocks in a changing climate. Central questions include:
(1) How do different vegetation types affect soil and ecosystem carbon stocks and CO2 balance?
(2) How do changes in rooting depth interact with depth gradients of soil properties to affect carbon stocks and CO2 fluxes?
(3) What is the net effect of expected changes in plant productivity, vegetation distribution and rooting on ecosystem carbon storage across the circum-Arctic?

The EXPERIMENTAL MODULE will quantify plant-soil carbon fluxes and plant impacts on soil CO2 release for different vegetation types and soil depths, combining a novel living-plant macrocosm experiment with field observations, cutting-edge 14C-dating (high risk) and 13C-labelling.
The MODELLING MODULE will take our recent model to the next level and integrate experimental data to calculate the combined plant effect on ecosystem CO2 sink/source strength in a changing Arctic. The model will be validated against Eddy Covariance-observed CO2 fluxes (high risk).

The integrated PRIMETIME approach will break new ground by shedding light on plant impacts on belowground carbon cycling, and provide a tool box to quantify and integrate these fine-scale processes in large-scale emission estimates.

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Topic(s)

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Funding Scheme

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HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

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(opens in new window) ERC-2021-STG

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Host institution

STOCKHOLMS UNIVERSITET
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 1 499 230,00
Address
UNIVERSITETSVAGEN 10
10691 Stockholm
Sweden

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Region
Östra Sverige Stockholm Stockholms län
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 1 499 230,00

Beneficiaries (1)

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