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<p>Agroforestry parklands with key species (<i>Vitellaria paradoxa</i> C.F. Gaertn. and <i>Parkia biglobosa</i> Jacq.) support carbon storage which is crucial for climate mitigation, but structural and diversity parameters that influence the latter remain underexplored. This study assesses the carbon storage potential of these parklands in Benin’s Sudanian (SZ) and Sudano-Guinean (SGZ) zones, focusing on diversity and structural parameters. Forest inventories with data on diameter at breast height (DBH) and total tree height were collected on 170 circular plots of 18&#xa0;m radius. Descriptive statistics were used to summarize structural, diversity and carbon storage parameters. A multiple linear model was used to assess structural and diversity parameter effects on carbon storage. Results indicated a low diversity in these parklands with 41 species belonging to 38 genera and 17 families and the Shannon index and Reciprocal Simpson index mean were 1.07 and 1.57, respectively. The mean DBH, height, tree density, and basal area differed significantly between SZ and SGZ. The mean carbon storage (Aboveground and Belowground) was 2.04 ± 1.11 MgC/ha, with significant differences between SZ (2.44 ± 1.19) and SGZ (1.83 ± 1.00). CO₂ equivalents were also higher in SZ (<i>p</i> &lt; 0.001). Key species’ carbon storage contribution was 49% and 51% of associated species. Tree density, basal area and species richness had a positive effect on carbon storage, while Shannon index had a negative effect. These results emphasize the crucial role of key species in carbon storage for climate change mitigation and highlight the need for further research on sustainable management practices to enhance carbon sequestration while preserving biodiversity.</p>

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Structural parameters and species diversity drive potential carbon storage in agroforestry parklands dominated by Vitellaria paradoxa C. F. Gaertn. and Parkia biglobosa Jacq. in Benin (West Africa)

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Chaffra Charles Yabi,
  • Serge Adomou,
  • Séverin Biaou,
  • Jacques Idohou Kadjogbé Ayena,
  • Thierry Dèhouégnon Houehanou,
  • Gérard Nounagnon Gouwakinnou

摘要

Agroforestry parklands with key species (Vitellaria paradoxa C.F. Gaertn. and Parkia biglobosa Jacq.) support carbon storage which is crucial for climate mitigation, but structural and diversity parameters that influence the latter remain underexplored. This study assesses the carbon storage potential of these parklands in Benin’s Sudanian (SZ) and Sudano-Guinean (SGZ) zones, focusing on diversity and structural parameters. Forest inventories with data on diameter at breast height (DBH) and total tree height were collected on 170 circular plots of 18 m radius. Descriptive statistics were used to summarize structural, diversity and carbon storage parameters. A multiple linear model was used to assess structural and diversity parameter effects on carbon storage. Results indicated a low diversity in these parklands with 41 species belonging to 38 genera and 17 families and the Shannon index and Reciprocal Simpson index mean were 1.07 and 1.57, respectively. The mean DBH, height, tree density, and basal area differed significantly between SZ and SGZ. The mean carbon storage (Aboveground and Belowground) was 2.04 ± 1.11 MgC/ha, with significant differences between SZ (2.44 ± 1.19) and SGZ (1.83 ± 1.00). CO₂ equivalents were also higher in SZ (p < 0.001). Key species’ carbon storage contribution was 49% and 51% of associated species. Tree density, basal area and species richness had a positive effect on carbon storage, while Shannon index had a negative effect. These results emphasize the crucial role of key species in carbon storage for climate change mitigation and highlight the need for further research on sustainable management practices to enhance carbon sequestration while preserving biodiversity.