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## Carbon and Nitrogen Stoichiometry of New Growth

The article discusses the carbon (C) and nitrogen (N) stoichiometry of new plant growth, describing the equations and parameters used in the model.

Key points:
- The carbon flux available for new growth allocation (CF_avail_alloc) is calculated by subtracting maintenance and excess respiration from gross primary productivity.
- Allocation of this available carbon to different plant tissues (leaves, fine roots, woody components) is determined by allometric parameters (a1, a2, a3, a4).
- The C:N ratios for each tissue type (CN_leaf, CN_fr, CN_lw, CN_dw) are defined as constants for each plant functional type.
- Equations are provided to calculate total C (CF_alloc) and N (NF_alloc) allocation to new growth based on the new leaf carbon allocation.
- The total plant N demand for new growth (NF_plant_demand) is then calculated from the available C allocation and the C:N ratios.

The summary captures the key aspects of the carbon-nitrogen stoichiometry modeling approach described in the article, including the relevant equations and parameters.