Summary:

Background Onset Growth
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The article describes a stress-deciduous phenology algorithm that handles situations where stress signals are absent and the vegetation shifts from a deciduous habit to an evergreen habit. In such cases, the regular onset flux mechanism is switched off, and a background onset growth algorithm is invoked (rbgtr > 0).

During this period, small fluxes of carbon and nitrogen from the storage pools into the associated transfer pools are calculated on each time step. The entire contents of the transfer pool are then added to the associated displayed growth pool on each time step.

The article provides the equations for calculating the carbon and nitrogen fluxes from the transfer pools to the corresponding displayed growth pools for various plant components, including leaves, fine roots, live stem, dead stem, live coarse roots, and dead coarse roots.

The key points are:

1. The background onset growth algorithm is used when stress signals are absent, and the vegetation becomes evergreen.
2. It involves small, continuous fluxes of carbon and nitrogen from storage to transfer pools, which are then added to the displayed growth pools.
3. The article provides the specific equations for calculating these carbon and nitrogen fluxes for different plant components.