J Integr Plant Biol. ›› 1991, Vol. 33 ›› Issue (12): -.

• Research Articles •    

Relationships Between Population Growth and Population Density in Monocultures of Larix leptolepis

Fang Jing-yun, Kan Makoto and Yamakura Takuo   

Abstract: One year-old Japanese larch (Larix leptolepis) seedlings were planted in a nursery from 1984 to 1986 at four density levels with four replicates in order to investigate the relationships between plant growth and density of survivors. As the results shown, self-thinning occurred severely in populations growing at high densities. The rate of the self-thinning followed a trajectory defined by the 3/2 power law. The relationship between mean dry weight per tree and population density at a given stage of growth followed the reciprocal equation and power equation at early experimental stages, but changed gradually to follow the 3/2 power law as plants grew further. Shch a change was mainly caused by the constant basal area per ms and decreased growth of tree height along a gradient of the density. The relationship between tree height (h) and density (p) also be discussed and in the 3/2 power law system it could be described by an equation consisting of h=αp(-1/2) where α is a constant.

Key words: Basal area of diameter per mS, Larix leptolepis, Reciprocal equation, Population density, 3/2 power law, Tree height

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