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<p>Tropical rainforests are critical for biodiversity, carbon sequestration, and providing ecosystem services. However, deforestation and overexploitation threaten forests sustainability for accurate resources management. The developments of volume equation for these forest reserves were to determine the growth of these natural forests for effective management of forest resources and their products. This study was conducted in Akure enrichment planting (EP) and Omo biosphere reserve (BR). Tree growth data were obtained for all trees (dbh ≥ 10&#xa0;cm) in 32 plots of 25 × 25&#xa0;m, plots were laid at alternate distance along transect at every 100&#xa0;m interval. In all the 32 sampled plots, total of individual trees were (EP 531; BR 514), constituting (EP 47; BR 52) species and (EP 21; BR 31) families. Species grouping was obtained using a cluster analysis to group the entire tree species in Akure EP (47) and Omo BR (52) into one of the five clusters. The species groups obtained did not follow any particular taxonomic pattern, as there were species of the same genus that fell into different clusters. The important value index (IVI) ranged from 0.357 to 7.419% for Akure EP and 0.021% 14.862% for Omo BR while Shannon-Wiener diversity index for Akure EP was 3.372 and Omo BR was 3.505. This indicated that there is high species richness in Omo BR than Akure EP. The mean form factor calculated for these forests were (EP 0.973; BR 0.695) while form factor estimation for tree species ranged from 0.502 to 1.590 in Akure EP and 0.214 to 0.757 for Omo BR. There was no significant difference (<i>p</i> &gt; 0.05) between the observed and predicted volumes for all models and there was strong positive correlation between observed and predicted volumes. Form factors and volume equation models derived in this study can be recommended for this forests and similar forests tree volume estimation.</p>

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Model and form factor determination for stand volume estimation in natural forest ecosystem and enrichment planting site

  • 期刊论文

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  • 发表日期：

    2025年8月13日

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  • Aladesanmi Daniel Agbelade

摘要

Tropical rainforests are critical for biodiversity, carbon sequestration, and providing ecosystem services. However, deforestation and overexploitation threaten forests sustainability for accurate resources management. The developments of volume equation for these forest reserves were to determine the growth of these natural forests for effective management of forest resources and their products. This study was conducted in Akure enrichment planting (EP) and Omo biosphere reserve (BR). Tree growth data were obtained for all trees (dbh ≥ 10 cm) in 32 plots of 25 × 25 m, plots were laid at alternate distance along transect at every 100 m interval. In all the 32 sampled plots, total of individual trees were (EP 531; BR 514), constituting (EP 47; BR 52) species and (EP 21; BR 31) families. Species grouping was obtained using a cluster analysis to group the entire tree species in Akure EP (47) and Omo BR (52) into one of the five clusters. The species groups obtained did not follow any particular taxonomic pattern, as there were species of the same genus that fell into different clusters. The important value index (IVI) ranged from 0.357 to 7.419% for Akure EP and 0.021% 14.862% for Omo BR while Shannon-Wiener diversity index for Akure EP was 3.372 and Omo BR was 3.505. This indicated that there is high species richness in Omo BR than Akure EP. The mean form factor calculated for these forests were (EP 0.973; BR 0.695) while form factor estimation for tree species ranged from 0.502 to 1.590 in Akure EP and 0.214 to 0.757 for Omo BR. There was no significant difference (p > 0.05) between the observed and predicted volumes for all models and there was strong positive correlation between observed and predicted volumes. Form factors and volume equation models derived in this study can be recommended for this forests and similar forests tree volume estimation.