## 2.20.1. General Phenology Flux Parameterization[¶](#general-phenology-flux-parameterization "Permalink to this headline")
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Fluxes of carbon and nitrogen from storage pools and into displayed tissue pools pass through a special transfer pool (denoted _\_xfer_), maintained as a separate state variable for each tissue type. Storage (_\_stor_) and transfer (_\_xfer_) pools are maintained separately to reduce the complexity of accounting for transfers into and out of storage over the course of a single growing season.

![Image 1: ../../_images/image110.png](https://escomp.github.io/ctsm-docs/versions/master/html/_images/image110.png)

Figure 2.20.1 Example of annual phenology cycle for seasonal deciduous.[¶](#id1 "Permalink to this image")

