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The objective of this study is to analyze the dendrochronological potential of two Sahelian species (B. senegalensis and S. birrea) and to evaluate the relationships between their growth rings and the climate. The study was conducted in 2016 in the Ferlo area of Senegal. The biological material consists of wood slices, taken from the trunks of thes...
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Context 1
... example, on some pucks in B. senegalensis, the observable rings show a real possibility of reading over the entire length of the sample and in others, there is a huge difficulty in reading the rings. The pucks sampled show, in general, a very eccentric heart, resulting from unbalanced growth around the trunk, and a large number of "growth abnormalities" such as double and discontinuous rings, scars left by human actions and animal attacks (Figure 7). ...
Citations
... Success of sustainable management of tree species relies on the knowledge about tree age, productivity, and forests dynamics (Bräuning et al., 2010;Nicolini et al., 2010;Gebrekirstos et al., 2014;Randriamalala et al., 2017). As the livelihoods of the majority of the people of West Africa are still based on natural resources, climate change which affects the sustainability of these resources is likely to drive the population of this region into poverty unless the resources are managed in sustainable way (Talla et al., 2021). Therefore, there is a need to explore site-and species-specific studies to develop the network of tree-ring chronologies in West Africa. ...
... Therefore, there is a need to explore site-and species-specific studies to develop the network of tree-ring chronologies in West Africa. Past successful dendrochronological studies, where more than fifty percent of variability could be accounted for, have been reported for some tree species (Nicolini et al., 2010;Gebrekirstos et al., 2012;Mbow et al., 2012;De Ridder et al., 2013;Sinsin et al., 2015;Boakye et al., 2016;Sanogo et al., 2016Sanogo et al., , 2022Talla et al., 2021). All the mentioned studies revealed that variation in rainfall has more influence on tree growth than variations in measured temperature. ...
... Indeed, a significant correlation was found between L. microcarpa tree growth (standard chronology) and precipitation in the two study sites (as well as between major seasonal precipitation and residual chronology). Similar findings were also reported in many tropical forests, particularly in the dry tropics including dry savannas in West Africa (Brienen et al., 2016;Hiltner et al., 2016;Locosselli et al., 2016;Schöngart et al., 2017;Mokria et al., 2017;Talla et al., 2021). However, the absence of significant correlation (r = 0.10, p > 0.05) between the standard chronologies at both sites indicates that L. microcarpa growth is not only influenced by precipitation but other factors such as site conditions (soil type, vegetation, management). ...
... Assessment of six tree species across two habitats clarified chronologies for Afzelia africana, Anogeissus leiocarpus, Daniellia oliveri, Diospyros abyssinica, Isoberlinia doka and Pterocarpus erinaceus (Schöngart et al., 2006). Subsequent studies of West African trees have analysed Acacia seyal (Nicolini et al., 2010;Mbow et al., 2012), Acacia macrostachya (Mbow et al., 2012), Afzelia africana (Boakye et al., 2016;Balima et al., 2020), Anogeissus leiocarpus (Sinsin et al., 2015;Boakye et al., 2016), Boscia senegalensis (Talla et al., 2021), Burkea africana (Sinsin et al., 2015), Faidherbia albida (Massaoudou et al., 2020), Sclerocarya birrea (Gebrekirstos et al., 2012;Talla et al., 2021), Terminalia macroptera (Mbow et al., 2012), Terminalia superba (De Ridder et al., 2013), Vitellaria paradoxa (Sanogo et al., 2016) and Strychnos spinosa (Avakoudjo et al. 2022). As an introduced species, Prosopis africana was studied (Massaoudou et al., 2020), but the chronologies of several of the species prioritized by Tarhule and Hughes (2002) remain undocumented. ...
... Assessment of six tree species across two habitats clarified chronologies for Afzelia africana, Anogeissus leiocarpus, Daniellia oliveri, Diospyros abyssinica, Isoberlinia doka and Pterocarpus erinaceus (Schöngart et al., 2006). Subsequent studies of West African trees have analysed Acacia seyal (Nicolini et al., 2010;Mbow et al., 2012), Acacia macrostachya (Mbow et al., 2012), Afzelia africana (Boakye et al., 2016;Balima et al., 2020), Anogeissus leiocarpus (Sinsin et al., 2015;Boakye et al., 2016), Boscia senegalensis (Talla et al., 2021), Burkea africana (Sinsin et al., 2015), Faidherbia albida (Massaoudou et al., 2020), Sclerocarya birrea (Gebrekirstos et al., 2012;Talla et al., 2021), Terminalia macroptera (Mbow et al., 2012), Terminalia superba (De Ridder et al., 2013), Vitellaria paradoxa (Sanogo et al., 2016) and Strychnos spinosa (Avakoudjo et al. 2022). As an introduced species, Prosopis africana was studied (Massaoudou et al., 2020), but the chronologies of several of the species prioritized by Tarhule and Hughes (2002) remain undocumented. ...
... (Fig. 3). Similar characteristics were reported by Sinsin Talla et al. (2021) for D. oliveri, Pericopsis elata and Sclerocarya birrea in Benin, in Central Republic of Africa and Senegal, respectively. The vessels of our studied species are round to oval shape and solitary or in small groups of two. ...
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.