Tree-size variable frequency distribution modelling for Cunminghamia lanceolata plantation
Keywords:
Cunminghamia lanceolata,, frequency distribution,, Lao Cai,, modellingAbstract
Understanding tree-size frequency distributions is essential for sustainable
forest ecosystem management. This study was conducted to understand
characteristics of growth quantities, select and compare the best
distributions for their frequency distributions in Lao Cai. The study
established 9 plots for Cunminghamia lanceolata stands and measured
plannt growth variables. The study tested 64 theoretical distributions. The
results showed that the average diameter was 16.41 cm, the average crown
diameter was 71.11 cm. The average total height and commercial height
were 6.71 m and 2.81 m, respectively. The similarity between the height
and the commercial height was higher. In contrast, the crown diameter had
a large difference with the remaining quantities. The distribution of
commercial height, crown diameter and diameter were left skewed.
Meanwhile, the frequency distribution of the total height was right skewed.
Gene. Gamma (4P) was the best distribution for diameter, while the
Wakeby distribution was the best distribution for crown diameter. For the
total height, the Dagum (4P) distribution had the highest ranking. In
contrast, for the commercial height, the Fatigue Life (3P) distribution
ranked highest. These best models can be used to recommend silvicultural
measures and contribute to sustainable forest management and planning in
the study area and areas with similar conditions.
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