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Silva Fennica 1926-1997
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Acta Forestalia Fennica
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Articles containing the keyword 'Burkina Faso'.

Category: Research article

article id 1631, category Research article
Jonas Koala, Louis Sawadogo, Patrice Savadogo, Ermias Aynekulu, Janne Heiskanen, Mohammed Saïd. (2017). Allometric equations for below-ground biomass of four key woody species in West African savanna-woodlands. Silva Fennica vol. 51 no. 3 article id 1631. https://doi.org/10.14214/sf.1631
Highlights: Species-specific equations for belowground biomass (BGB) predicted biomass with less bias than generic equations; All the generic equations underestimated BGB; For accurate estimation of BGB in savanna-woodlands, species-specific equations are needed for more species.

Accurate estimates of both above-ground biomass (AGB) and below-ground biomass (BGB) are essential for estimating carbon (C) balances at various geographical scales and formulating effective climate change mitigation programs. However, estimating BGB is challenging, particularly for forest ecosystems, so robust allometric equations are needed. To obtain such equations for savanna-woodlands of the West African north sudanian zone, we selected four common native woody species (Anogeissus leiocarpa (DC.) Guill. & Perr., Detarium microcarpum Guill. & Perr., Piliostigma thonningii (Schumach.) Milne-Redh. and Vitellaria paradoxa C.F. Gaertn.). At two sites in Burkina Faso, we determined the BGB of 30 trees of each of these species by excavation, and measured various above-ground dimensional variables. The root:shoot ratio varied widely among the species, from 0.1 to 3.4. Depending on the species, allometric equations based on stem basal area at 20 cm height, basal area at breast height and tree height explained 50–95% of the variation in BGB. The best generic equation we obtained, based on basal area at 20 cm, explained 60% of the variation in BGB across the species. Three previously published generic allometric equations underestimated BGB by 8 to 63%. The presented equations should significantly improve the accuracy of BGB estimates in savanna-woodlands and help avoid costly needs to excavate root systems.

  • Koala, Centre National de Recherche Scientifique et Technologique (CNRST), Institut de l’Environnement et de Recherches Agricoles (INERA), Département Productions Forestières, 03 BP 7047, Ouagadougou 03, Burkina Faso ORCID ID:E-mail: ezeyamb@yahoo.fr (email)
  • Sawadogo, Centre National de Recherche Scientifique et Technologique (CNRST), Institut de l’Environnement et de Recherches Agricoles (INERA), Département Productions Forestières, 03 BP 7047, Ouagadougou 03, Burkina Faso ORCID ID:E-mail: sawadogo_ls@hotmail.com
  • Savadogo, World Agroforestry Centre & International Crop Research Institute for the Semi-Arid Tropics (ICRAF-ICRISAT), West and Central Africa Region-Sahel Node, BP 12404, Niamey, Niger ORCID ID:E-mail: savadogo.patrice@gmail.com
  • Aynekulu, World Agroforestry Centre (ICRAF), United Nations Avenue, P.O. Box 30677-00100, Nairobi, Kenya ORCID ID:E-mail: e.betemariam@cgiar.org
  • Heiskanen, University of Helsinki, Department of Geosciences and Geography, P.O. Box 68, FI-00014 University of Helsinki, Finland ORCID ID:E-mail: janne.heiskanen@helsinki.fi
  • Saïd, International Livestock Research Institute (ILRI). P.O. Box 30709, Nairobi, Kenya ORCID ID:E-mail: m.said@cgiar.org
article id 452, category Research article
Catherine Ky-Dembele, Mulualem Tigabu, Jules Bayala, Patrice Savadogo, Issaka Joseph Boussim, Per Christer Odén. (2010). Clonal propagation of Detarium microcarpum from root cuttings. Silva Fennica vol. 44 no. 5 article id 452. https://doi.org/10.14214/sf.452
Detarium microcarpum is a valuable tree species for fuelwood, timber, food and medicine in sub-Saharan Africa. However, its population is dwindling due to overexploitation, its seedlings’ low survival rate and slow growth. Vegetative propagation might enhance both survival and growth, but to date a successful clonal method does not exist for D. microcarpum. We conducted four experiments to examine the effects of propagation environment (high versus low humidity), cutting length and diameter, alignment of root segments (horizontal versus vertical) and distance from the root collar of donors on the regeneration ability of root segments collected from field-grown D. microcarpum trees in Burkina Faso. The size of root segments significantly affected their regeneration ability, while alignment had no effect. Sprouting was possible from 10 and 20-cm long segments of 15–60 mm diameter with 7–43% sprouting efficiency and multiple shoots while 5 cm long segments were unsuitable with 0–3% sprouting efficiency. Cuttings maintained at low humidity produced larger diameter sprouts than those in greenhouse. All cuttings showed strong polarity with most of the shoots developing at the proximal end. Rootlings from 20 cm root segments produced more new roots (0.62 ± 0.08 g) than those from 10 cm segments (0.34 ± 0.09 g), but they were similar for sprout and leaf growth. We conclude that lateral roots of field-grown mature trees can be used to produce rootlings in a nursery. Since this study is the first attempt to propagate D. microcarpum from root cuttings, further investigations are required to optimize the technique.
  • Ky-Dembele, Département Productions Forestières, Institut de l’Environnement et de Recherches Agricoles, 03 BP 7047 Ouagadougou 03, Burkina Faso & Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre, P.O. Box 101, SE-230 53 Alnarp, Sweden (catherine.dembele@ess.slu.se) ORCID ID:E-mail: kydembele@hotmail.com (email)
  • Tigabu, Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre, P.O. Box 101, SE-230 53, Alnarp, Sweden ORCID ID:E-mail:
  • Bayala, World Agroforestry Centre, West Africa and Centre Regional Office, Sahel Node, BP E5118 Bamako, Mali ORCID ID:E-mail:
  • Savadogo, Département Productions Forestières, Institut de l’Environnement et de Recherches Agricoles, 03 BP 7047 Ouagadougou 03, Burkina Faso & Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre, P.O. Box 101, SE-230 53 Alnarp, Sweden ORCID ID:E-mail:
  • Boussim, Université de Ouagadougou, Unité de Formation et Recherche en Sciences de la Vie et de la Terre, 03 BP 7021, Ouagadougou 03, Burkina Faso ORCID ID:E-mail:
  • Odén, Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre, P.O. Box 101, SE-230 53, Alnarp, Sweden ORCID ID:E-mail:

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