Regreening Africa enhances resilience in the Sahel and Horn of Africa by addressing climate change, land degradation, and food insecurity. Through a broad partnership network, the initiative scales context-appropriate land restoration by integrating trees and sustainable practices into farming and pastoral systems. Phase II expands efforts in Somalia, Ethiopia, Senegal, Nigeria, Ghana, Mali, and Niger, focusing on systems scaling for transformative change. Building on Phase I, this phase promotes agroforestry, FMNR, soil and water conservation, soil health improvement, grazing management, and energy-efficient cookstoves to boost land productivity and resilience, particularly in rangeland and mixed landscapes.
Tag: Agroforestry
Climate-growth relationships of Daniellia oliveri (Rolfe) Hutch. & Dalziel in the Sudanian zone of Mali, West Africa
Tree rings depend on seasonal variation in radial tree growth. Where they can be identified, their interannual variation may reflect climate variability. Compared to its use in temperate and boreal regions, tree-ring analysis has been less applied in tropical Africa, with weaker seasonality. Daniellia oliveri often forms the tallest trees in agroforestry parklands of the Sudanian savanna zone of Mali but its growth response to climate (rainfall, temperature) variability has not been documented. We analyzed six stem disks of D. oliveri and used standard dendrochronological methods to process the samples. Contrary to earlier literature likely based on more humid parts of the species distribution range, D. oliveri formed distinct growth ring boundaries in our study area. The mean annual radial growth was 2.73 ± 0.56 mm. All measured tree-ring series were successfully cross-dated with a GLK (Gleichläufigkeit) value of 76.3 ± 5.6. The final tree-ring chronology covers the period 1909-2021. After removing age-related growth trends, the tree-ring width index showed a significant relationship with records of annual rainfall (r2 = 0.46, n = 100 years, p < 0.001). The relationship between wet-season (June to September) precipitation and the residual chronology was slightly higher (r2 = 0.50, n = 100 years, p < 0.001). However, no significant correlation was found for temperature. These results imply that D. oliveri can be successfully used for dendrochronological studies with relevance for the management and restoration of the ecosystems in the Sudanian zone of West Africa, where long-term rainfall records are scarce.
Scaling & Enhancing Restoration Impact Through Gender Transformative Approaches
Regreening Africa enhances resilience in the Sahel and Horn of Africa by addressing climate change, land degradation, and food insecurity. Through a broad partnership network, the initiative scales context-appropriate land restoration by integrating trees and sustainable practices into farming and pastoral systems. Phase II expands efforts in Somalia, Ethiopia, Senegal, Nigeria, Ghana, Mali, and Niger, focusing on systems scaling for transformative change. Building on Phase I, this phase promotes agroforestry, FMNR, soil and water conservation, soil health improvement, grazing management, and energy-efficient cookstoves to boost land productivity and resilience, particularly in rangeland and mixed landscapes.
Scaling & Enhancing Restoration Impact Through Gender Transformative Approaches
Regreening Africa enhances resilience in the Sahel and Horn of Africa by addressing climate change, land degradation, and food insecurity. Through a broad partnership network, the initiative scales context-appropriate land restoration by integrating trees and sustainable practices into farming and pastoral systems. Phase II expands efforts in Somalia, Ethiopia, Senegal, Nigeria, Ghana, Mali, and Niger, focusing on systems scaling for transformative change. Building on Phase I, this phase promotes agroforestry, FMNR, soil and water conservation, soil health improvement, grazing management, and energy-efficient cookstoves to boost land productivity and resilience, particularly in rangeland and mixed landscapes.
Upscaling of agar orchard to agroforestry systems for improving productivity and land use efficiency in the Brahmaputra floodplain of Bangladesh
The commercial plantation of agar trees has been increasing in the Brahmaputra floodplain under the greater Mymensingh region of Bangladesh. Agar plantation in the plainland allows enough space for cultivating different crops in between the two rows of agar trees. The present field study transformed a commercial agar (Aquilaria malaccensis Roxb.) plantation into agroforestry systems, where the performance of winter vegetables (radish, spinach, broccoli, and tomato) and the annual crop papaya were evaluated at different distances from the tree row. Afterward, it was compared with their respective non-agroforestry sole crops planted in open-field (control) conditions. The findings of the investigation revealed that the yield reduction for radish, spinach, broccoli, and tomato was 40%, 58%, 37%, and 40%, respectively, in agroforestry systems compared to the control. The yields of the seasonal crops were boosted with increasing planting distances from tree rows. These findings also indicated that the light intensity, which is indispensable for crop production, was highly interfered with in the agroforestry system by the straight canopy structure of agar trees. Though having some adverse impacts on yield performances of seasonal crops, the net return, benefit–cost ratio (BCR), and land equivalent ratio (LER) were greatly higher in agar-based agroforestry systems compared to non-agroforestry systems. Compared to non-agroforestry control plots, the total nitrogen, phosphorus, and potassium content in agroforestry systems was 41%, 27%, and 150% higher, respectively. Thus, it can be concluded that the Aquilaria plantation can be transformed into an agroforestry system to ensure higher income, optimum land use, and soil fertility status, and sustain food security.
Scaling & Enhancing Restoration Impact Through Gender Transformative Approaches
Regreening Africa enhances resilience in the Sahel and Horn of Africa by addressing climate change, land degradation, and food insecurity. Through a broad partnership network, the initiative scales context-appropriate land restoration by integrating trees and sustainable practices into farming and pastoral systems. Phase II expands efforts in Somalia, Ethiopia, Senegal, Nigeria, Ghana, Mali, and Niger, focusing on systems scaling for transformative change. Building on Phase I, this phase promotes agroforestry, FMNR, soil and water conservation, soil health improvement, grazing management, and energy-efficient cookstoves to boost land productivity and resilience, particularly in rangeland and mixed landscapes.
Vegetation Structure and Diversity Under Farmer Managed Natural Regeneration: A Comparison of Silvo-Arable and Silvo-Pastoral Systems in Kenya
Farmer Managed Natural Regeneration (FMNR) is a low-cost, adaptable agroforestry practice that enhances land restoration by promoting systematic integration of naturally regenerating trees within farming systems through tree selection and management. Despite its increasing adoption in sub-Saharan Africa, comparative evidence across land uses remains limited. This study empirically compares tree and woody regeneration density, species richness, and composition between silvo-arable (maize cultivation) and silvo-pastoral (grazing) FMNR systems in semi-arid Kenya. Sixty-three plots were established across these two land uses, within which a total of 1409 trees and 505 woody regeneration individuals were recorded. Tree density was higher in silvo-pastoral FMNR systems (558/ha) than in silvo-arable systems (150/ha), though the difference was not statistically significant. In contrast, woody regeneration density was significantly greater in silvo-arable systems (2450/ha vs. 727/ha). Rarefied species richness of trees was the same in silvo-arable FMNR and silvo-pastoral FMNR systems, while richness of regeneration was either significantly higher than the tree community, like in silvo-arable systems, or significantly lower than the tree community, like in silvo-pastoral systems. Non-metric multidimensional scaling showed that silvo-pastoral FMNR systems exhibited similar species composition between trees and regeneration, whereas silvo-arable FMNR systems displayed greater variability in tree composition across fields, reflecting less variable preferences by farmers. Given that regeneration represents future tree communities, reduced regeneration diversity in silvo-pastoral systems may constrain long-term species richness. These findings suggest that silvo-arable and silvo-pastoral FMNR systems follow distinct restoration pathways, with implications for biodiversity conservation, livelihoods, and the scaling of FMNR as a restoration practice.
Temporal and spatial variability in photosynthetic activity of Vitellaria paradoxa in agroforestry parklands of Burkina Faso
This study investigated the temporal and spatial variation in photosynthetic activity of Vitellaria paradoxa (shea tree) growing in agroforestry parklands across two contrasting climatic zones of Burkina Faso. Measurements of chlorophyll fluorescence, chlorophyll content, leaf temperature, stomatal conductance, and environmental variables were conducted from April to December 2023 to assess physiological responses to climatic variability. Significant differences were observed between the northern and southern Sudanian phytogeographical zones, particularly in chlorophyll content, energy dissipation mechanisms, and photosynthetic performance. Trees in the more humid southern Sudanian zone exhibited higher chlorophyll content and better photosynthetic efficiency than those in the drier northern zone. Leaf temperature was strongly influenced by ambient temperature, while vapor pressure deficit and photosynthetically active radiation affected stomatal conductance and energy dissipation processes. The results demonstrate that V. paradoxa possesses physiological mechanisms that enable adaptation to changing environmental conditions, including regulation of heat dissipation, chlorophyll utilization, and gas exchange. These findings improve understanding of the ecophysiological resilience of shea trees under climate change and provide insights for sustaining agroforestry parklands in the Sudano-Sahelian region.
Climate-growth relationships of Daniellia oliveri (Rolfe) Hutch. & Dalziel in the Sudanian zone of Mali, West Africa
Tree rings depend on seasonal variation in radial tree growth. Where they can be identified, their interannual variation may reflect climate variability. Compared to its use in temperate and boreal regions, tree-ring analysis has been less applied in tropical Africa, with weaker seasonality. Daniellia oliveri often forms the tallest trees in agroforestry parklands of the Sudanian savanna zone of Mali but its growth response to climate (rainfall, temperature) variability has not been documented. We analyzed six stem disks of D. oliveri and used standard dendrochronological methods to process the samples. Contrary to earlier literature likely based on more humid parts of the species distribution range, D. oliveri formed distinct growth ring boundaries in our study area. The mean annual radial growth was 2.73 ± 0.56 mm. All measured tree-ring series were successfully cross-dated with a GLK (Gleichläufigkeit) value of 76.3 ± 5.6. The final tree-ring chronology covers the period 1909-2021. After removing age-related growth trends, the tree-ring width index showed a significant relationship with records of annual rainfall (r2 = 0.46, n = 100 years, p < 0.001). The relationship between wet-season (June to September) precipitation and the residual chronology was slightly higher (r2 = 0.50, n = 100 years, p < 0.001). However, no significant correlation was found for temperature. These results imply that D. oliveri can be successfully used for dendrochronological studies with relevance for the management and restoration of the ecosystems in the Sudanian zone of West Africa, where long-term rainfall records are scarce.
Climate-growth relationships of Daniellia oliveri (Rolfe) Hutch. & Dalziel in the Sudanian zone of Mali, West Africa
Tree rings depend on seasonal variation in radial tree growth. Where they can be identified, their interannual variation may reflect climate variability. Compared to its use in temperate and boreal regions, tree-ring analysis has been less applied in tropical Africa, with weaker seasonality. Daniellia oliveri often forms the tallest trees in agroforestry parklands of the Sudanian savanna zone of Mali but its growth response to climate (rainfall, temperature) variability has not been documented. We analyzed six stem disks of D. oliveri and used standard dendrochronological methods to process the samples. Contrary to earlier literature likely based on more humid parts of the species distribution range, D. oliveri formed distinct growth ring boundaries in our study area. The mean annual radial growth was 2.73 ± 0.56 mm. All measured tree-ring series were successfully cross-dated with a GLK (Gleichläufigkeit) value of 76.3 ± 5.6. The final tree-ring chronology covers the period 1909-2021. After removing age-related growth trends, the tree-ring width index showed a significant relationship with records of annual rainfall (r2 = 0.46, n = 100 years, p < 0.001). The relationship between wet-season (June to September) precipitation and the residual chronology was slightly higher (r2 = 0.50, n = 100 years, p < 0.001). However, no significant correlation was found for temperature. These results imply that D. oliveri can be successfully used for dendrochronological studies with relevance for the management and restoration of the ecosystems in the Sudanian zone of West Africa, where long-term rainfall records are scarce.