Summary of the article:

Fire Impact in the Community Land Model (CLM)

1. Fire Carbon Emissions
   - Carbon emissions from biomass burning of each plant functional type (PFT), φ_j, are calculated as:
     φ_j = A_b,j * C_j * CC_j
     where A_b,j is the burned area, C_j is the carbon density vector, and CC_j is the combustion completeness factor vector.
   - Litter and coarse woody debris burning contribute additional carbon emissions.

2. Fire-induced Mortality and Carbon Transfers
   - Uncombusted carbon from leaf, stem, root, and transfer/storage pools is transferred to litter, Ψ_j1, based on mortality factors.
   - Uncombusted carbon from live stems is transferred to dead stems, Ψ_j2.
   - Fire nitrogen emissions and transfers are calculated similarly using the same combustion and mortality factors.

3. Dynamic Vegetation Impact
   - With dynamic vegetation enabled, the number of killed tree individuals per unit area, P_disturb,j, is calculated based on burned area, PFT population density, and whole-plant mortality factor.

The article provides the detailed equations and parameters used in the CLM to simulate the impacts of fire on carbon and nitrogen cycling, as well as the effects on dynamic vegetation.