Multi-model soil carbon simulation

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Method synopsis

Comparative simulation study using five different soil organic carbon models (DAYCENT, CORPSE, MIMICS, MEND, RESOM) to project responses to warming and litter addition manipulations. Models were run under identical conditions to isolate differences in model structure and assumptions.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure as described in the canonical source

Steps below were extracted from the paper that introduces this protocol — Multiple models and experiments underscore large uncertainty in soil carbon dynamics (2018), Biogeochemistry. Implementations in other papers (listed below) may differ.

1. Model equilibration
   Each of the five SOC models (DAYCENT, CORPSE, MIMICS, MEND, RESOM) was spun up to equilibrium under constant environmental conditions with continuous carbon inputs until reaching steady state.
   Quantities: Constant temperature 20°C, moisture 50% of saturation, carbon inputs 500 g C m⁻² year⁻¹, equilibration target less than 0.5% change in total carbon stock over 50-year periodDuration: Spun up separately for each combination of clay content and litter quality until equilibrium reachedConditions: Constant temperature 20°C, moisture 50% of saturation
   Equipment: Five different soil carbon models: DAYCENT, CORPSE, MIMICS, MEND, RESOM
2. Warming manipulation simulations
   Applied instantaneous step changes in temperature above baseline conditions and ran simulations to observe model responses over time.
   Quantities: Temperature increases of 2°C and 5°C above 20°C baseline, maintaining same litter composition and quality as spin-upDuration: 50 years of simulation following temperature manipulationConditions: Doubled carbon input rate relative to spin-up (1000 g C m⁻² year⁻¹), same litter composition and quality
   Equipment: Same five soil carbon models
3. Litter addition manipulation simulations
   Applied doubling of continuous carbon input rate while maintaining baseline temperature and simulated model responses.
   Quantities: Carbon inputs doubled from 500 to 1000 g C m⁻² year⁻¹, temperature maintained at 20°CDuration: 50 years of simulation following litter input manipulationConditions: Baseline temperature 20°C, baseline moisture 50% saturation

Typical Equipment

• Five different soil carbon models: DAYCENT, CORPSE, MIMICS, MEND, RESOM

Output Measurements

• total soil carbon stocks
• CO2 flux rates
• protected and unprotected carbon fractions

Papers Using This Protocol (1)

Species Studied With This Protocol

Places Where Used