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## Photosynthetic Capacity

The article discusses the representation of photosynthetic capacity in the CTSM (Community Terrestrial System Model) through two key parameters:

### 1. Maximum Rate of Carboxylation (Vc,max25)
This represents the maximum rate of carboxylation at 25°C.

### 2. Maximum Rate of Electron Transport (Jmax25) 
This represents the maximum rate of electron transport at 25°C.

These parameters are predicted by the LUNA (Leaf Utilization of Nitrogen for Assimilation) V1.0 model, which is based on an optimality hypothesis for nitrogen allocation among different plant functions. The key assumptions are:

1. Nitrogen allocated for light capture, electron transport, and carboxylation are co-limiting.
2. Respiratory nitrogen is allocated to maintain dark respiration determined by Vc,max.

The advantage of the LUNA model is its ability to predict the potential acclimation of photosynthetic capacities under different environmental conditions, such as temperature, radiation, CO2 concentrations, day length, and humidity.