Modelling CO2 and phosphorus interactions
Project team: Belinda Medlyn (Western Sydney University), Min Zhao (Western Sydney University), further: Kristian Schufft (Max-Planck Institute for Biogeochemistry), Katrin Fleischer (Vrije Universiteit Amsterdam), Anja Rammig (Technical University of Munich), Lin Yu (University Hamburg), Mingkai Jiang (Zhejiang University), Soenke Zaehle (Max-Planck Institue for Biogeochemistry)
Project period: 2023 – ongoing
Summary
Modelling plant soil interactions under CO2 and P fertilization. Specifically implementing root exudation and its impacts on microbes/feedbacks to plants in the terrestrial biosphere model QUINCY-JSM. Observations for evaluating the model used published data (2013-2023) and data, currently in review (2025)
Findings so far: In the model, increased root exudation let to increased heterotrophic respiration under eCO2. A substantial percentage of the additional exudation was directly respired. While root exudation increased microbial induced cycling of soil organic matter (SOM), the impacts on actual SOM-stocks were relatively small. Under simulated P fertilization root exudation and plant-microbe competition for additional available PO4, driven by microbial and plant demand, modulates the effect of P fertilization on soil respiration
Publications
One paper in review. One paper in preparation (2025)
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