A new density model of Cryptomeria fortunei plantation

Abstract

According to the volume increase model of an average individual tree in a plant population and the theory of invariable final output, we put forward a new density model of plant population: V^-β=AN^βB. Here N means the stand density and V stands for average individual tree volume; A, B and β are parameters that change with growth stage. Using the density variation of standard plots of Cryptromeria fortunei plantation to verify the new model, it turns out that this model can well simulate the population density effect law of C. fortunei plantation, and it is markedly better and shows higher accuracy than the commonly used reciprocal model of density effect and secondary-effect model. Let β=1, we can obtain the reciprocal model of density effect, which means the reciprocal model of density effect is only a special case of this new model.