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# Stress-Deciduous: Long Growing Season

## Overview
When stress-deciduous vegetation is assigned to a climate where strong stresses occur less frequently than once per year, the algorithm shifts towards evergreen behavior. This is evaluated by tracking the number of days since the most recent onset period (n_days_active).

## Long Growing Season (LGS) Calculation
- LGS is calculated as:
  - 0 for n_days_active < 365
  - (n_days_active/365) - 1 for 365 <= n_days_active < 730
  - 1 for n_days_active >= 730

## Background Litterfall Rate
- The background litterfall rate (r_bglf) is calculated as a function of LGS:
  - r_bglf = LGS / (τ_leaf * 365 * 86400)
  - Where τ_leaf is the leaf longevity
- This results in a shift to continuous litterfall as n_days_active increases from 365 to 730.

## Background Onset Growth from Transfer Pools
- The background onset growth rate (r_bgtr) also depends on LGS:
  - r_bgtr = LGS / (365 * 86400)
- This leads to continuous transfer from storage to display pools at a rate that would result in complete turnover of the storage pools in one year at steady state, once LGS reaches 1 (after two years without stress-deciduous offset conditions).

In summary, the article describes how the stress-deciduous algorithm transitions towards evergreen behavior when stress conditions do not occur frequently enough, with calculations for the long growing season variable and its impact on background litterfall and onset growth rates.