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The growth characteristics of the aboveground vegetative organs in two fig cultivars, ‘Masui dauphine’ and ‘Houraishi’ (Ficus carica L.), were analyzed by applying numerical techniques of logistic theory of the density effect to the results from our preceding study, which dealt with the influence of tree density on aboveground vegetative growth and reproduction in young fig monocultures. Three major growth characteristics, biological time (τ), growth rate (λ), and final yield (Y) in aboveground vegetative organs, were calculated by the theory, and their seasonal changes were examined. The τ and Y represented a sigmoid curve with respect to time, while λ peaked in late June or early July and decreased after mid-July. Throughout the growing season before defoliation, τ, λ, and Y were always larger in ‘Houraishi’ than in ‘Masui dauphine’, clearly suggesting the superiority of ‘Houraishi’ to ‘Masui dauphine’ in aboveground vegetative growth. The proposed index could express the distance between focal cultivars in terms of three growth characteristics. By comparing λ values of the cultivars with those of other herbs and trees, the status of cultivars in the biological gradient of plant growth rates was examined, and it was concluded that the cultivars are neither herbs nor trees but in-between. Furthermore, the effect of plant mass removal caused by natural or artificial events was incorporated into the reciprocal equation of the density effect in order to discuss leaf defoliation and shoot pruning.

Analysis of Aboveground Vegetative Growth by Using the Logistic Theory of the Density Effect in Young Monocultures of Ficus carica L.