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<p>Despite the importance of FMNR, the temporal ecological dynamics of woody species along the climate gradient remain poorly understood in Niger. This study seeks to examine temporal variability in the diversity and structural features of woody species from 2019–2024 over 300–400&#xa0;mm and 400–500&#xa0;mm isohyets found in south-central Niger. It employed a combination of forest inventory and socio-economic surveys. This study took place in georeferenced plots of 2500&#xa0;m2, established in 2019 and revisited in 2024. A total of 271 plots were evaluated, 100 of them in the 300–400&#xa0;mm zone and 171 in the 400–500&#xa0;mm zone. Diameter at breast height, total height and the two perpendicular crown diameters, in each plot, were measured on all trees with a diameter ≥ 2&#xa0;cm to establish diversity, structural and dendrometric parameters. Additionally, 230 farmers practicing FMNR across 14 sites were interviewed regarding their tree management practices. Our results revealed a slight increase in diversity in the two zones. The basal area also increased at 16.20% in the first zone and at 20.70% in the second. A similar trend was observed for canopy cover at 8.40% and 2.20% in the 300–400&#xa0;mm and 400–500&#xa0;mm zones, respectively. Both canopy cover and adult tree density decreased in the 300–400&#xa0;mm zone at − 2.9% and − 11.4%, respectively. Farmers’ perceptions of cultural practices showed a decrease in topping, clear-cutting, and pruning in the 400–500&#xa0;mm zone, while an increase in the last two practices was reported in the 300–400&#xa0;mm zone, likely influencing the observed dynamics. Although the absence of a non-FMNR control treatment is a limitation, these findings highlight a woody species dynamic associated with FMNR, among others, that would be strengthened, particularly in the 300–400&#xa0;mm zone, for the sustainable management of agroforestry parklands in Niger.</p>

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Influence of farmer-managed natural regeneration (FMNR) on the woody species diversity and structure in agroforestry parklands of South-central Niger

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Maman Mansour Samaila Abdou,
  • Massaoudou Moussa,
  • Dan Lamso Nomaou,
  • Félix Christian Serge Zounon,
  • Tougiani Abasse

摘要

Despite the importance of FMNR, the temporal ecological dynamics of woody species along the climate gradient remain poorly understood in Niger. This study seeks to examine temporal variability in the diversity and structural features of woody species from 2019–2024 over 300–400 mm and 400–500 mm isohyets found in south-central Niger. It employed a combination of forest inventory and socio-economic surveys. This study took place in georeferenced plots of 2500 m2, established in 2019 and revisited in 2024. A total of 271 plots were evaluated, 100 of them in the 300–400 mm zone and 171 in the 400–500 mm zone. Diameter at breast height, total height and the two perpendicular crown diameters, in each plot, were measured on all trees with a diameter ≥ 2 cm to establish diversity, structural and dendrometric parameters. Additionally, 230 farmers practicing FMNR across 14 sites were interviewed regarding their tree management practices. Our results revealed a slight increase in diversity in the two zones. The basal area also increased at 16.20% in the first zone and at 20.70% in the second. A similar trend was observed for canopy cover at 8.40% and 2.20% in the 300–400 mm and 400–500 mm zones, respectively. Both canopy cover and adult tree density decreased in the 300–400 mm zone at − 2.9% and − 11.4%, respectively. Farmers’ perceptions of cultural practices showed a decrease in topping, clear-cutting, and pruning in the 400–500 mm zone, while an increase in the last two practices was reported in the 300–400 mm zone, likely influencing the observed dynamics. Although the absence of a non-FMNR control treatment is a limitation, these findings highlight a woody species dynamic associated with FMNR, among others, that would be strengthened, particularly in the 300–400 mm zone, for the sustainable management of agroforestry parklands in Niger.