Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria

Oladele Fisayo Falade; Dami Adewale Aruwajoye

doi:doi:10.11648/j.ajaf.20231104.12

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Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria

Oladele Fisayo Falade, Dami Adewale Aruwajoye

Published in American Journal of Agriculture and Forestry (Volume 11, Issue 4)

Received: 31 May 2023 Accepted: 21 June 2023 Published: 11 July 2023

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Abstract

Size and species structures control the natural mechanisms maintaining high structural diversity. Use of size inequality and species diversity measures singly for conservation decisions brings about inconsistent results. Therefore, most conservation efforts fail due to lack of understanding of mechanisms promoting coexistence of tree species. However, relationship between size inequality and species diversity indicates the natural mechanism promoting coexistence of high species diversity. Therefore, this study investigated the relationship between tree size inequality and species diversity in Akure Strict Nature Reserve. Eighteen and twelve plots (30m × 30m) were laid on parallel transects of 3.60km long and 50m width in Old-growth and Riparian forests, respectively. Trees with diameter-at-breast-height (dbh) ≥ 10cm were counted and identified to species level. Tree diameter at base, middle and top and total height were measured using girth tape and Relaskop. Tree species diversity (Shannon-Weiner; Simpson; Margalef indices) and dbh inequality measures (Gini coefficient, Gini; Coefficient of Variation, CV; Skewness Coefficient, Skewness) were computed and compared. Stem biomass were computed and converted to carbon stock. Data were analysed using descriptive, and correlation analysis at α_0.05. Fifty-five (56) tree species representing 17 families were found in the forest. Species diversity indices were higher in Riparian while size inequalities in Old-growth forests. GC correlate with Shannon-Weiner (r=0.54; n=18, p≤0.018) and Margalef (r=0.473; n=18, p≤0.04) in Old-growth while GC correlate with CV (r=0.716; n=12, p≤0.09) in Riparian forests. The size inequality measures were strongly related with each other in Riparian while species and size inequality measures were strongly related with each other in Old-growth forests. The carbon stocks of Old-growth and Riparian forests were 117.21Mg/ha and 43.47Mg/ha, respectively. Triplochiton scleroxylon and Bridelia micrantha contained highest carbon stock in Old-growth and Riparian forests, respectively. Asymmetric mode of interaction in the absence of competition shows competition for below-ground resource, especially presence of moisture and nutrient gradient. Size inequality among different and within the same species determined coexistence tree communities in Old-growth and Riparian forests of Akure Strict Nature Reserve, respectively.

Published in	American Journal of Agriculture and Forestry (Volume 11, Issue 4)
DOI	10.11648/j.ajaf.20231104.12
Page(s)	128-135
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2023. Published by Science Publishing Group

Keywords

Tree Species Diversity, Stem Size Hierarchy, Tree Size Inequality, Stem Carbon Stock

References

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Oladele Fisayo Falade, Dami Adewale Aruwajoye. (2023). Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria. American Journal of Agriculture and Forestry, 11(4), 128-135. https://doi.org/10.11648/j.ajaf.20231104.12

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Oladele Fisayo Falade; Dami Adewale Aruwajoye. Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria. Am. J. Agric. For. 2023, 11(4), 128-135. doi: 10.11648/j.ajaf.20231104.12

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Oladele Fisayo Falade, Dami Adewale Aruwajoye. Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria. Am J Agric For. 2023;11(4):128-135. doi: 10.11648/j.ajaf.20231104.12

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@article{10.11648/j.ajaf.20231104.12,
  author = {Oladele Fisayo Falade and Dami Adewale Aruwajoye},
  title = {Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria},
  journal = {American Journal of Agriculture and Forestry},
  volume = {11},
  number = {4},
  pages = {128-135},
  doi = {10.11648/j.ajaf.20231104.12},
  url = {https://doi.org/10.11648/j.ajaf.20231104.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajaf.20231104.12},
  abstract = {Size and species structures control the natural mechanisms maintaining high structural diversity. Use of size inequality and species diversity measures singly for conservation decisions brings about inconsistent results. Therefore, most conservation efforts fail due to lack of understanding of mechanisms promoting coexistence of tree species. However, relationship between size inequality and species diversity indicates the natural mechanism promoting coexistence of high species diversity. Therefore, this study investigated the relationship between tree size inequality and species diversity in Akure Strict Nature Reserve. Eighteen and twelve plots (30m × 30m) were laid on parallel transects of 3.60km long and 50m width in Old-growth and Riparian forests, respectively. Trees with diameter-at-breast-height (dbh) ≥ 10cm were counted and identified to species level. Tree diameter at base, middle and top and total height were measured using girth tape and Relaskop. Tree species diversity (Shannon-Weiner; Simpson; Margalef indices) and dbh inequality measures (Gini coefficient, Gini; Coefficient of Variation, CV; Skewness Coefficient, Skewness) were computed and compared. Stem biomass were computed and converted to carbon stock. Data were analysed using descriptive, and correlation analysis at α0.05. Fifty-five (56) tree species representing 17 families were found in the forest. Species diversity indices were higher in Riparian while size inequalities in Old-growth forests. GC correlate with Shannon-Weiner (r=0.54; n=18, p≤0.018) and Margalef (r=0.473; n=18, p≤0.04) in Old-growth while GC correlate with CV (r=0.716; n=12, p≤0.09) in Riparian forests. The size inequality measures were strongly related with each other in Riparian while species and size inequality measures were strongly related with each other in Old-growth forests. The carbon stocks of Old-growth and Riparian forests were 117.21Mg/ha and 43.47Mg/ha, respectively. Triplochiton scleroxylon and Bridelia micrantha contained highest carbon stock in Old-growth and Riparian forests, respectively. Asymmetric mode of interaction in the absence of competition shows competition for below-ground resource, especially presence of moisture and nutrient gradient. Size inequality among different and within the same species determined coexistence tree communities in Old-growth and Riparian forests of Akure Strict Nature Reserve, respectively.},
 year = {2023}
}

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TY - JOUR
T1 - Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria
AU - Oladele Fisayo Falade
AU - Dami Adewale Aruwajoye
Y1 - 2023/07/11
PY - 2023
N1 - https://doi.org/10.11648/j.ajaf.20231104.12
DO - 10.11648/j.ajaf.20231104.12
T2 - American Journal of Agriculture and Forestry
JF - American Journal of Agriculture and Forestry
JO - American Journal of Agriculture and Forestry
SP - 128
EP - 135
PB - Science Publishing Group
SN - 2330-8591
UR - https://doi.org/10.11648/j.ajaf.20231104.12
AB - Size and species structures control the natural mechanisms maintaining high structural diversity. Use of size inequality and species diversity measures singly for conservation decisions brings about inconsistent results. Therefore, most conservation efforts fail due to lack of understanding of mechanisms promoting coexistence of tree species. However, relationship between size inequality and species diversity indicates the natural mechanism promoting coexistence of high species diversity. Therefore, this study investigated the relationship between tree size inequality and species diversity in Akure Strict Nature Reserve. Eighteen and twelve plots (30m × 30m) were laid on parallel transects of 3.60km long and 50m width in Old-growth and Riparian forests, respectively. Trees with diameter-at-breast-height (dbh) ≥ 10cm were counted and identified to species level. Tree diameter at base, middle and top and total height were measured using girth tape and Relaskop. Tree species diversity (Shannon-Weiner; Simpson; Margalef indices) and dbh inequality measures (Gini coefficient, Gini; Coefficient of Variation, CV; Skewness Coefficient, Skewness) were computed and compared. Stem biomass were computed and converted to carbon stock. Data were analysed using descriptive, and correlation analysis at α0.05. Fifty-five (56) tree species representing 17 families were found in the forest. Species diversity indices were higher in Riparian while size inequalities in Old-growth forests. GC correlate with Shannon-Weiner (r=0.54; n=18, p≤0.018) and Margalef (r=0.473; n=18, p≤0.04) in Old-growth while GC correlate with CV (r=0.716; n=12, p≤0.09) in Riparian forests. The size inequality measures were strongly related with each other in Riparian while species and size inequality measures were strongly related with each other in Old-growth forests. The carbon stocks of Old-growth and Riparian forests were 117.21Mg/ha and 43.47Mg/ha, respectively. Triplochiton scleroxylon and Bridelia micrantha contained highest carbon stock in Old-growth and Riparian forests, respectively. Asymmetric mode of interaction in the absence of competition shows competition for below-ground resource, especially presence of moisture and nutrient gradient. Size inequality among different and within the same species determined coexistence tree communities in Old-growth and Riparian forests of Akure Strict Nature Reserve, respectively.
VL - 11
IS - 4
ER -

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Author Information

Oladele Fisayo Falade

Department of Forest Production and Products, University of Ibadan, Ibadan, Nigeria
Dami Adewale Aruwajoye

Department of Forest Production and Products, University of Ibadan, Ibadan, Nigeria

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APA Style

Oladele Fisayo Falade, Dami Adewale Aruwajoye. (2023). Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria. American Journal of Agriculture and Forestry, 11(4), 128-135. https://doi.org/10.11648/j.ajaf.20231104.12

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ACS Style

Oladele Fisayo Falade; Dami Adewale Aruwajoye. Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria. Am. J. Agric. For. 2023, 11(4), 128-135. doi: 10.11648/j.ajaf.20231104.12

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Oladele Fisayo Falade, Dami Adewale Aruwajoye. Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria. Am J Agric For. 2023;11(4):128-135. doi: 10.11648/j.ajaf.20231104.12

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@article{10.11648/j.ajaf.20231104.12,
  author = {Oladele Fisayo Falade and Dami Adewale Aruwajoye},
  title = {Tree Species and Size Diversity of Akure Strict Nature Reserve, Nigeria},
  journal = {American Journal of Agriculture and Forestry},
  volume = {11},
  number = {4},
  pages = {128-135},
  doi = {10.11648/j.ajaf.20231104.12},
  url = {https://doi.org/10.11648/j.ajaf.20231104.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajaf.20231104.12},
  abstract = {Size and species structures control the natural mechanisms maintaining high structural diversity. Use of size inequality and species diversity measures singly for conservation decisions brings about inconsistent results. Therefore, most conservation efforts fail due to lack of understanding of mechanisms promoting coexistence of tree species. However, relationship between size inequality and species diversity indicates the natural mechanism promoting coexistence of high species diversity. Therefore, this study investigated the relationship between tree size inequality and species diversity in Akure Strict Nature Reserve. Eighteen and twelve plots (30m × 30m) were laid on parallel transects of 3.60km long and 50m width in Old-growth and Riparian forests, respectively. Trees with diameter-at-breast-height (dbh) ≥ 10cm were counted and identified to species level. Tree diameter at base, middle and top and total height were measured using girth tape and Relaskop. Tree species diversity (Shannon-Weiner; Simpson; Margalef indices) and dbh inequality measures (Gini coefficient, Gini; Coefficient of Variation, CV; Skewness Coefficient, Skewness) were computed and compared. Stem biomass were computed and converted to carbon stock. Data were analysed using descriptive, and correlation analysis at α0.05. Fifty-five (56) tree species representing 17 families were found in the forest. Species diversity indices were higher in Riparian while size inequalities in Old-growth forests. GC correlate with Shannon-Weiner (r=0.54; n=18, p≤0.018) and Margalef (r=0.473; n=18, p≤0.04) in Old-growth while GC correlate with CV (r=0.716; n=12, p≤0.09) in Riparian forests. The size inequality measures were strongly related with each other in Riparian while species and size inequality measures were strongly related with each other in Old-growth forests. The carbon stocks of Old-growth and Riparian forests were 117.21Mg/ha and 43.47Mg/ha, respectively. Triplochiton scleroxylon and Bridelia micrantha contained highest carbon stock in Old-growth and Riparian forests, respectively. Asymmetric mode of interaction in the absence of competition shows competition for below-ground resource, especially presence of moisture and nutrient gradient. Size inequality among different and within the same species determined coexistence tree communities in Old-growth and Riparian forests of Akure Strict Nature Reserve, respectively.},
 year = {2023}
}

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