Maturity

: Light extinction coefficient

: Radiation use efficiency in ambient CO((kg/ha)/(MJ/m))

CO: Elevated CO atmospheric concentration (ppmv)

: Radiation use efficiency at elevated CO atmospheric concentration value for CO((kg/ha)/(MJ/m))

: The number of years for the tree species to reach full development (years)

: The biomass of a fully developed tree stand for the specific tree species (metric tons/ha)

: Rate of decline in radiation-use efficiency per unit increase in vapor pressure deficit (kg/ha⋅(MJ/m)⋅kPaor(10 g/MJ)⋅kPa)

: potential heat units for plant growing at beginning of simulation (heat units)

: potential heat units for plant whose growth is initiated in a planting operation (heat units)

: Fraction of the growing season corresponding to the 1st point on the optimal leaf area development curve

: Fraction of the maximum plant leaf area index corresponding to the 1st point on the optimal leaf area development curve

: Fraction of the growing season corresponding to the 2nd point on the optimal leaf area development curve

: Fraction of the maximum plant leaf area index corresponding to the 2nd point on the optimal leaf area development curve

: Plant’s potential maximum canopy height (m)

: Potential maximum leaf area index for the plant

: Fraction of growing season at which senescence becomes the dominant growth process

: Maximum rooting depth in soil (mm)

: Maximum rooting depth for plant (mm)