Nonlinear Height-Stump Diameter Models for Tectona grandis Linn. F Stands in Omo Forest Reserve, Nigeria

Chukwu, Onyekachi; Osho, J.S.A.

doi:10.31357/jtfe.v7i2.3307

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…The high basal area is correlated to a large tree diameter of the accounted tree individuals (Verma et al 2014;Chukwu et al 2018). In general, the overall mangrove tree density along the Bintuni riverbank was considered as high, ranging from 9,400 trees ha -1 found in Kamp.…”

Section: Discussionmentioning

confidence: 99%

Diversity, composition, structure and canopy cover of mangrove trees in six locations along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia

et al. 2022

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Abstract. Srau M, Bawole R, Marwa J, Sinery AS, Cabuy RL. 2022. Diversity, composition, structure and canopy cover of mangrove trees in six locations along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia. Biodiversitas 23: 5835-5843. Mangroves provide various benefits of ecological and socio-economic aspects. Such benefits could be delivered if mangrove vegetation is in good condition, indicated by several ecological parameters. This study was conducted to investigate the diversity, composition, structure, and canopy cover of mangrove trees along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia. There were six different locations representing biotic and abiotic conditions. The study only focused on the mangrove tree stage with a total of 175 plots established, of which each plot had a size of 10 × 10 m. The name of mangrove species, tree diameter, total height, and canopy cover percentage was recorded and measured. The result showed that the diversity and composition of mangrove trees varied among the six locations indicated by the importance value index (IVI) parameter. The estuary and sub-estuary areas were dominated by Rhizophora mucronata, while in the further area from the estuary toward the land, the dominant mangrove species was Avicennia sp. The highest number of mangrove trees was found in Kampung Lama 1 with 989 trees/ha (593 trees in 60 plots) with an average diameter of 18.8077 cm (SD±7.0279) and an average height of 8.9477 m (SD±2.2814). The lowest tree distribution was found in Kampung Masuhi with 940 trees/ha (94 trees in 10 plots) with an average diameter of 15.4787 m (SD±3.8205). The highest average of canopy covers was noted in the sub-river estuary with a percentage of 86.97% (SD±85) and the lowest percentage was in Kampung Masina with 59.89% (SD±124.85). Statistical analysis of variance (ANOVA) showed that there was a significant difference in terms of average tree diameter and height among the six locations with a p-value of 0.00021 < 0.05 at 95% CI. There was a strong positive correlation between tree diameter and height, as indicated by R2 of 0.69. In addition, a statistical test of analysis of variance from each location was significantly different among these six locations.

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Section: Discussionmentioning

confidence: 99%

Diversity, composition, structure and canopy cover of mangrove trees in six locations along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia

et al. 2022

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“…Chukwu and Olajuyigbe (2017) posited that one major concern about forest sustenance and carbon sequestration is the threat of impermanence, a situation where the forest is destroyed through burning or cutting down at any stage for whatever reason, thus, potentially releasing most of the sequestered carbon back into the atmosphere. There is no doubt that sustainable trade in timber and non-timber forest products can significantly aid transparency and tracking of the sector's activities through certification (Chukwu and Olajuyigbe, 2017).…”

Section: Forestrymentioning

confidence: 99%

Potentials, drivers and barriers to green economy transition: Implications for Africa

Chukwu

2020

Adv. J. Plant Biol.

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African countries depend majorly on natural resources for livelihood sustenance. Despite many untapped potentials in some sectors of Africa's economy, the continent is still faced with several social, economic and environmental problems. Green economy presents an appealing policy framework to help the continent overcome these challenges and transit to a more environmentally-friendly, low-carbon and resource-efficient economy. Achieving this socially-inclusive viable economy is limited by weak institutions and political will, human and institutional capacity gaps, a paucity of data for impact assessment, poor awareness of the benefits of green economy concepts and poor coordination among green economy actors. This review identifies the potentials, drivers and barriers to a green economy in Africa. Some countries recognised the role of the green economy in sustainable development. However, mainstreaming the right policy mix into national plans across the sectors of society remains a big challenge. This review thus recommends strengthening both public institutions and political will that will help to prioritise policy frameworks, mainstream private sector involvement, close capacity gaps, create sufficient public awareness and build sectoral synergy among green economy actors for an environmentally-sustainable, low-carbon and resource-efficient economy.

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“…In practice, instances of illegal tree felling arise, leaving only ground diameter (DG) information for felled trees. Hence, DG serves as a valuable predictor for accurately estimating tree-loss resources [25].…”

Section: Introductionmentioning

confidence: 99%

Construction of Compatible Volume Model for Populus in Beijing, China

Wang,

Feng

et al. 2024

Forests

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The accurate assessment of tree volume is crucial for developing forest management plans, and this can be achieved using tree volume models. In this study, data on individual trees were collected and calculated, including the diameter at breast height (D), ground diameter (DG), tree height (H), and tree volume (V). A total of 400 Populus × tomentosa Carrière, 400 Populus tomentosa Carr, and 400 Populus × canadensis Moench trees were sampled. Two compatible volume model systems were established using corresponding methods. The models consisted of the following five types: V-DH, V-D, V-DG, H-D, and DG-D. In our calculations, before the horizontal line was the dependent variable, and behind the horizontal line was the independent variable. Variations in preferences for the H-D models were observed among the tree species, with the logistic function proving the most suitable for Populus × tomentosa Carrière, Chapman–Richard function for Populus tomentosa Carr, and power function for Populus × canadensis Moench. Among the three volume models, the V-DH model exhibited a superior performance, with its R2 values ranging from 0.965 to 0.984 and mean estimated error (MPE) values ranging from 1.26% to 1.78%. Following this was the V-D model, with R2 values between 0.9359 and 0.9704 and MPE values between 1.71% and 2.46%. The V-DG model ranked third, with R2 values ranging from 0.8746 to 0.9501 and MPE values ranging from 2.33% to 3.16%. In the H-D model, the R2 and MPE values ranged from 0.4998 to 0.7851 and from 1.31% to 1.45%, respectively. For the DG-D model, the R2 values ranged from 0.9563 to 0.9868 and the MPE values ranged from 0.47% to 0.68%. Comparing both compatible methods, the nonlinear seemingly uncorrelated regression (NSUR) was more effective. The three volume models demonstrated high levels of accuracy and compatibility, providing a reliable scientific foundation for forest management and the formulation of harvesting plans in Beijing, with significant practical implications.

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Nonlinear Height-Stump Diameter Models for Tectona grandis Linn. F Stands in Omo Forest Reserve, Nigeria

Cited by 9 publications

References 14 publications

Diversity, composition, structure and canopy cover of mangrove trees in six locations along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia

Diversity, composition, structure and canopy cover of mangrove trees in six locations along Bintuni riverbank, Bintuni Bay, West Papua, Indonesia

Potentials, drivers and barriers to green economy transition: Implications for Africa

Construction of Compatible Volume Model for Populus in Beijing, China

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