TF24
model
TF24 is the hydraulically-explicit strategy. It keeps the trait-based functional-balance growth and allocation machinery of FF16 but replaces FF16’s fixed light-use efficiency with a mechanistic leaf model: at each instant the plant chooses stomatal conductance to maximise carbon profit net of the hydraulic cost of transpiration.
That leaf-level optimisation — photosynthetic revenue from the Farquhar model, hydraulic cost from a xylem vulnerability curve, and the golden-section search that balances them — is the heart of TF24 and is documented in full on the core theory page:
- Assimilation & hydraulics — the profit-maximisation leaf model, equation by equation, with worked examples.
How TF24 relates to FF16
| FF16 | TF24 | |
|---|---|---|
| Carbon income | fixed leaf-level light-use efficiency | Farquhar photosynthesis coupled to stomatal conductance |
| Water | implicit | explicit supply–demand hydraulics with a vulnerability curve |
| Stomata | — | conductance set by profit maximisation |
| Allocation / growth | functional balance (shared) | functional balance (shared) |
Everything below the leaf model — how assimilate is turned into height, diameter, and tissue pools, and how those feed the size-structured PDE — is inherited from FF16.
Soil water and root uptake
TF24’s hydraulics terminate at the root collar. The supply side — soil water balance and multi-layer root water uptake — has been prototyped and benchmarked separately; those explorations live in the notebook:
The original strategy_TF24 vignette was an empty stub. This page assembles TF24 from its documented parts (the leaf model and the inherited FF16 machinery). A full strategy-level write-up — the exact coupling of the leaf model into whole-plant growth, and the complete TF24 parameter set — is still TODO and should be supplied by the model authors rather than guessed.