- KOREAN
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- E-ISSN2288-1220
- SCOPUS, KCI
ISSN : 2287-8327
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Relationship between Maximum Stem Volume and Density during a Courseof Self-thinning in a Cryptomeria japonica Plantation
Akio Hagihara (Ryukyus Univ.)
Abstract
Cryptomeria japonica plantation was monitored every year during 15 years from 1983 to 1997 for stem diameter and volume. The reciprocal equation, 1Y= A + BN , was applied to the relationship between cumulative volume Y and cumulative number N from the largest tree in the stand each year. The parameters A and B, which means respectively the reciprocal of an asymptotic value of total stand stem volume and the reciprocal of the maximum stem volume, are related by a power function. The power functional relationship between A and B derived a linear relationship of B-points (NB, YB; NB = BA, YB = 1 2A) of each Y-N curve on log-log coordinates. The gradient of B-point line was so steep that the Y-N curve moved parallel upward year by year. The time trajectory of mean stem volume (‾w ) and density (ρ) provided evidence in favor of the 3/2 power law of self-thinning, because the gradient of ‾w -ρ trajectory on log-log coordinates approximated to -3/2 at the final stage of stand development. On the basis of the results of Y-N curves and ‾w -ρ trajectory, the time trajectory of maximum stem volume wmaxobs and ρ was derived theoretically. The gradient of wmax obs - ρ trajectory on log-log coordinates is calculated to be -0.6105 at the final stage. The gradient of wmax obs - ρ trajectory was steeper than that of ‾w -ρ trajectory at the early stage, while the former is gentler than the latter at the later stage.
- keywords
- Cryptomeria japonica, Density, Maximum stem volume, Mean stem volume, 3/2 power law of selfthinning, Y-N curve
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