Multiple soil nutrient competition between plants, microbes, and mineral surfaces
January 18, 2016
- Develop, calibrate, and test a nutrient competition model that accounts for multiple soil nutrients and abiotic consumers.
- Calibrate and test model against N and P fertilization experiments.
- Predict dynamic competitive regimes.
- Model includes three primary soil nutrients (NH4+, NO3-, POx) and five competitors (plant roots, decomposing microbes, nitrifiers, denitrifiers, and mineral surfaces).
- Competition modeled with the Equilibrium Chemistry Approximation (ECA).
- Calibrated at a tropical forest site (Tapajos) and tested at two other tropical forest sites (Hawaii and Puerto Rico).
- Model accurately replicated the experimentally manipulated forest responses that were not used in model calibration.
- Relative competitiveness of consumers was dynamic. For NH4, nitrifiers and decomposers were comparably competitive and out-competed roots.
- These mechanisms are being integrated in ALM and tested against >80 field studies.
Zhu, Qing, William J. Riley, Jinyun Tang, and Charles D. Koven. January 18, 2016. “Multiple Soil Nutrient Competition Between Plants, Microbes, and Mineral Surfaces: Model Development, Parameterization, and Example Applications in Several Tropical Forests.” Biogeosci., 13(1):341–363. doi:10.5194/bg-13-341-2016.