sum_of_clm_tech_note/CLM50_Tech_Note_Decomposition/2.21.2.-Century-based-Pool-Structure-Rate-Constants-and-Parameterscentury-based-pool-structure-rate-constants-and-parameters-Permalink-to-this-headline.sum.md

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Century-based Decomposition Cascade

The Century-based decomposition cascade is a first-order decay model, similar to CLM-CN, but with differences in the number of pools, pool connections, turnover times, and respired fractions.

Pool Structure, Turnover Times, and C:N Ratios

The Century-based model has the following pool structure, turnover times, and C:N ratios:

• CWD: 4.1 year turnover time
• Litter 1, 2, 3: 0.066, 0.25, 0.25 year turnover times
• SOM 1: 0.17 year turnover time, C:N ratio of 8
• SOM 2: 6.1 year turnover time, C:N ratio of 11
• SOM 3: 270 year turnover time, C:N ratio of 11

Respiration Fractions

The respiration fractions for the litter and SOM pools in the Century-based structure are:

• Litter 1: 0.55
• Litter 2, 3: 0.5
• SOM 1: variable (function of text, not provided)
• SOM 2, 3: 0.55

In summary, the Century-based decomposition cascade model has a distinct pool structure, turnover times, C:N ratios, and respiration fractions compared to the CLM-CN model, reflecting different assumptions about soil organic matter dynamics.