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  • The seedlings and adult trees are divided to phenological functional types, based on the timing of bud burst
  • For each functional type, the bud burst is determined to occur at a fixed calendar day
  • The phenological functional types are arranged in sequential order according to the timing of bud burst
  • For each phenological functional type there is no leaf area before the bud burst (no light absorption or shading), and full leaf area after bud burst (full light absorption and shading)
  • The light model is used to simulate the light environment separately for the periods from the timing of bud burst of one functional type to the timing of bud burst of the following functional type
  • The period of the last simulation of the light model starts at the timing of the bud burst of the latest functional type and ends at the end of growing season (if it is equal for all functional types, otherwise more model simulations are needed)
  • The total radiation available annually for each functional type is the sum of radiation available during all periods after its bud burst
  • Generally, each year there are as many runs of the light model as is the number of the phenological functional types. For other processes the time step of the model is one year