Regeneration; Timber species; Pest resistance; Light; Tropical forest management; Seedling
Abstract :
[en] Aucoumea klaineana Pierre isthemost exploited timber species inCentral Africa. Innatural forests, itsregeneration ishindered byvarious factors, including limited light availability andpest attacks. Toaddress these challenges anddevelop effective forest management practices, acomprehensive understanding of A. klaineana seedling ecology isnecessary. This study investigated thelight requirements andpestresistance of A. klaineana seedlings under different light conditions through an18-month experiment conducted inGabon. Sixshade houses with varying light intensities were constructed, ranging from 1%to62%offullirradiance, along with an unshaded platform representing 100%light. Six-month-old seedlings were planted among shade houses and platform and monitored monthly forgrowth parameters (relative growth rate inheight and diameter), morphological parameters (number ofleaves, both total and compound) and mortality. Productivity (total seedling biomass), biomass allocation traits (leaves, roots, andstem mass ratios), number ofbranches, and symptoms ofpests attacks were assessed after 18months. Results: reveal thatlight conditions influence seedling performance, with optimal levels forbiomass andrelative growth rate indiameter andheight identified between 9%and62%ofrelative irradiance. However, pest infestation, particularly bypsyllids andblack canker, poses substantial threats toseedling growth, health, and form, regardless oflight conditions. Pest attacks hadasignificant impact ongrowth butnotonsurvival, which remained high (97.1 %)even under extreme lights conditions (1%and100 %ofrelative irradiance). The findings underscore theimportance ofintegrating pest management strategies andadapting silvicultural practices tomeet thespecies ’ ecological requirements. Wesuggest planting A. klaineana insmall groups (toallow root anastomoses), separated byother species (tolimit pestcontamination), under light canopy cover (around 9–62% ofrelative irradiance, topromote sustained growth rates attheseedling stage). This approach should ensure the conservation of A. klaineana populations andthelong-term viability ofCentral Africa’stimber industry.
Disciplines :
Entomology & pest control Environmental sciences & ecology Phytobiology (plant sciences, forestry, mycology...) Life sciences: Multidisciplinary, general & others
Author, co-author :
Guidosse, Quentin ; Université de Liège - ULiège > TERRA Research Centre
Biwolé, Achille
De Clerck, Caroline ; Université de Liège - ULiège > TERRA Research Centre > Plant Sciences
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Bibliography
Agyeman, V., Swaine, M., Thompson, J., Kyereh, B., Duah-Gyamfi, A., Foli, E., Adu-Bredu, S., A comparison of tree seedling growth in artificial gaps of different sizes in two contrasting forest types. Ghana J. Fores 26 (2010), 14–40, 10.4314/gjf.v26i1.66199.
Agyeman, V.K., Swaine, M.D., Thompson, J., Responses of tropical forest tree seedlings to irradiance and the derivation of a light response index. J. Ecol. 87 (1999), 815–827, 10.1046/j.1365-2745.1999.00400.x.
Aphalo, P.J., Slowikowski, K., Mouksassi, S., 2024. “ggpmisc” Package: Miscellaneous Extensions to “ggplot2.”.
Baraloto, C., Goldberg, D.E., Bonal, D., Performance trade-offs among tropical tree seedlings in contrasting microhabitats. Ecology 86 (2005), 2461–2472, 10.1890/04-1956.
Biraud, J., Reconstitution naturelle et amélioration des peuplements d'okoumé du Gabon. Bois For. Trop. 66 (1959), 3–28.
Biraud, J., Catinot, R., Les plantations artificielles d'Okoumé au Gabon. Bois For. Trop., 1960, 3–24.
Biwolé, A.B., Dainou, K., Fayolle, A., Hardy, O.J., Brostaux, Y., Coste, S., Delion, S., Betti, J.L., Doucet, J.-L., Light Response of Seedlings of a Central African Timber Tree Species, Lophira alata (Ochnaceae), and the Definition of Light Requirements. Biotropica 47 (2015), 681–688, 10.1111/btp.12258.
Blaser, J., Frizzo, J.C., Norgrove, L., 2021. Not only timber: the potential for managing non-timber forest products in tropical production forests—a comprehensive literature review, in: 50. Presented at the w. ITTO Technical Series No. 50. International Tropical Timber Organization (ITTO), Yokohama, Japan.
Bosu, P.P., Cobbinah, J.R., Nichols, J.D., Nkrumah, E.E., Wagner, M.R., Survival and growth of mixed plantations of Milicia excelsa and Terminalia superba 9 years after planting in Ghana. For. Ecol. Manag. 233 (2006), 352–357, 10.1016/j.foreco.2006.05.032.
Bouet, C., La saga de l'Okoumé au Gabon. Cah. O.R.S.T.O.M. S. éR. Sci. Hum. 17 (1980), 269–272.
Brienen, R.J.W., Zuidema, P.A., Lifetime growth patterns and ages of Bolivian rain forest trees obtained by tree ring analysis. J. Ecol. 94 (2006), 481–493, 10.1111/j.1365-2745.2005.01080.x.
Caballé, G., 1978. Essai sur la géographie forestière du Gabon.
Caballé, G., Fontes, J., Les inventaires forestiers au Gabon: Application à la phytogéographie. Bois Et. êts Des. Trop., 1978, 15–33.
Caroff, Y., Rydalesky, G., 1970. Zones climatiques au Gabon, ASECNA. ed. Libreville, Gabon.
De Kam, M., Verkaar, H.J.P.A., Evers, P.V., Van Dam, B.C., Breteler, F.J., Biologie de l'okoumé. Rapport final de l'appui technique (No. IBN Research Report 96/8). Fondation Tropenbos. Wagening., Pays Bas, 1996.
Delègue, M.-A., Fuhr, M., Schwartz, D., Mariotti, A., Nasi, R., Recent origin of a large part of the forest cover in the Gabon coastal area based on stable carbon isotope data. Oecologia 129 (2001), 106–113, 10.1007/s004420100696.
Dent, D.H., Burslem, D.F.R.P., Performance Trade-offs Driven by Morphological Plasticity Contribute to Habitat Specialization of Bornean Tree Species: Habitat Specialization of Tropical Tree Species. Biotropica 41 (2009), 424–434, 10.1111/j.1744-7429.2009.00505.x.
Dos Santos, V.A.H.F., Ferreira, M.J., Initial establishment of commercial tree species under enrichment planting in a Central Amazon secondary forest: Effects of silvicultural treatments. For. Ecol. Manag. 460 (2020), 1–10, 10.1016/j.foreco.2019.117822.
Doucet, J.-L., 2003. L'alliance délicate de la gestion forestière et de la biodiversité dans les forêts du centre du Gabon (PhD Thesis). Université de Liège - Gembloux Agro-Bio Tech, Gembloux, Belgium.
Doucet, J.-L., African Rain Forests: Evolution and Threats. Presented at the International Symposium Tropical Forests in a Changing Global Context, Royal Academy of Overseas Sciences United Nations Educational. Sci. Cult. Organ., Bruss., 2004, 45–60.
Doucet, J.-L., Otimbo, Nchandi, Boubady, A.-G, P.-A., Comment assister la régénération naturelle de l'okoumé dans les concessions forestières. Bois For. Trop. 279 (2004), 59–72.
Doucet, J.-L., Daïnou, K., Ligot, G., Ouédraogo, D.-Y., Bourland, N., Ward, S.E., Tekam, P., Lagoute, P., Fayolle, A., Enrichment of Central African logged forests with high-value tree species: testing a new approach to regenerating degraded forests. Int. J. Biodivers. Sci., Ecosyst. Serv. Manag. 12 (2016), 83–95, 10.1080/21513732.2016.1168868.
Durrieu de Madron, L.D., Forni, E., Mekok, M., 1998. Les techniques d'exploitation à faible impact en forêt dense humide camerounaise (No. 17), Forafri. CIRAD-Forêt.
Eba'a Atyi, R., Hiol Hiol, F., Lescuyer, G., Mayaux, P., Defourny, P., Bayol, N., Saracco, F., Pokem, D., Sufo Kankeu, R., Nasi, R., Les forêts du bassin du Congo: État des Forêts 2021. Center for International Forestry Research (CIFOR). Bogor.,Indonésie, 2022, 10.17528/cifor/008565.
Engone Obiang, N.L., Ngomanda, A., White, L.J.T., Jeffery, K.J., Chézeaux, É., Picard, N., Disentangling the effect of size and competition: a growth model for Aucoumea klaineana. Ann. For. Sci. 70 (2013), 241–249, 10.1007/s13595-012-0255-7.
Ezzine De Blas, D., Ruiz Pérez, M., Prospects for Reduced Impact Logging in Central African logging concessions. For. Ecol. Manag. 256 (2008), 1509–1516, 10.1016/j.foreco.2008.05.016.
Fayolle, A., Ouédraogo, D.-Y., Ligot, G., Daïnou, K., Bourland, N., Tekam, P., Doucet, J.-L., Differential Performance between Two Timber Species in Forest Logging Gaps and in Plantations in Central Africa. Forests 6 (2015), 380–394, 10.3390/f6020380.
FRMi, 2018. Vision stratégique et industrialisation de la filière Bois dans les 6 pays du Bassin du Congo. Horizon 2030. Accroitre/ Sécuriser/ Valoriser les ressources en bois (Rapport stratégique régional), Développement intégré et durable de la filière bois dans le Bassin du Congo: opportunités, défis et recommandations opérationnelles. Plan de travail issu de la mission de cadrage. Montpellier, France.
Fuhr, M., 1999. Structure et dynamique de la forêt côtière du Gabon. Implications pour une succession secondaire dérivant de la forêt monodominante à Okoumé ( Aucoumea klaineana Pierre) (PhD Thesis). Université Montpellier II.
Fuhr, M., Delegue, M.-A., Nasi, R., Minkoué, J.-M., 1998. Dynamique et croissance de l'Okoumé en zone côtière du Gabon (No. 16), Forafri. CIRAD-Forêt, Montpellier, France.
Gilbert, G., La masse forestière congolaise. Bois For. Trop. 204 (1984), 3–20.
Goodale, U.M., Ashton, M.S., Berlyn, G.P., Gregoire, T.G., Singhakumara, B.M.P., Tennakoon, K.U., Disturbance and tropical pioneer species: Patterns of association across life history stages. For. Ecol. Manag. 277 (2012), 54–66, 10.1016/j.foreco.2012.04.020.
Grison, F., Travaux sur la biologie florale de l'Okoumé. Bois For. Trop. 166 (1976), 46–47.
Grison, F., Où en est l'amélioration génétique de l'Okoumé au Gabon?. Rev. Fr. 31 (1979), 504–511, 10.4267/2042/21308.
Groulez, J., Note sur les plantations de conversion dans les forêts tropicales humides. Bois For. Trop., 1975, 3–25.
Guidosse, Q., du Jardin, P., White, L.J.T., Lassois, L., Doucet, J.-L., Gabon's green gold: a bibliographical review of thirty years of research on okoumé (Aucoumea klaineana Pierre). Biotechnol. Agron. Soc. Environ. 26 (2022), 30–42, 10.25518/1780-4507.19458.
Hall, J.S., Harris, D.J., Medjibe, V., Ashton, P.M.S., The effects of selective logging on forest structure and tree species composition in a Central African forest: implications for management of conservation areas. For. Ecol. Manag. 183 (2003), 249–264, 10.1016/S0378-1127(03)00107-5.
Hawthorne, W., 1993. Forest regeneration after logging: findings of a study in the Bia South Game Production Reserve, Ghana, ODA Forestry Series. ODA, United Kingdom.
Hawthorne, W., 1995. Ecological profiles of Ghanaian forest trees, Tropical forestry papers. Oxford Forestry Institute, Department of Plant Sciences, University of Oxford [u.a.], Oxford.
Karsenty, A., Gourlet-Fleury, S., Assessing Sustainability of Logging Practices in the Congo Basin's Managed Forests: the Issue of Commercial Species Recovery. ES, 11, 2006, art26, 10.5751/ES-01668-110126.
Koumba Zaou, P., Mapaga, D., Verkaar, H.J., Effect of shade on young Aucoumea klaineana Pierre trees of various provenance under field conditions. For. Ecol. Manag. 106 (1998), 107–114, 10.1016/S0378-1127(97)00301-0.
Koumba Zaou, P., Nze Nguema, S., Mapaga, D., Deleporte, P, Croissance de 13 essences de bois d’œuvre plantées en forêt gabonaise. Bois For. Trop. 256 (1998), 21–33.
Kyereh, B., Swaine, M.D., Thompson, J., Effect of light on the germination of forest trees in Ghana. J. Ecol. 87 (1999), 772–783, 10.1046/j.1365-2745.1999.00386.x.
Leroy Deval, J., 1974. Structure dynamique de la rhizosphère de l'okoumé dans ses rapports avec la sylviculture. CTFT, Nogent-sur-Marne.
Leroy Deval, J., 1976a. Biologie et sylviculture de l'Okoumé (Aucoumea klaineana Pierre). Tome 1: La sylviculture de l'Okoumé, CTFT. ed. Nogent-sur-Marne.
Leroy Deval, J., 1976b. Biologie et sylviculture de l'Okoumé (Aucoumea klaineana Pierre). Tome 2: Maladies et défauts de l'Okoumé, CTFT. ed. Nogent-sur-Marne.
Leroy Deval, J., Les liaisons et anastomoses racinaires. Bois For. Trop. 152 (1973), 37–49, 10.19182/bft1973.152.a19173.
Loubota Panzou, G.J., Ligot, G., Gourlet-Fleury, S., Doucet, J., Forni, E., Loumeto, J., Fayolle, A., Architectural differences associated with functional traits among 45 coexisting tree species in Central Africa. Funct. Ecol. 32 (2018), 2583–2593, 10.1111/1365-2435.13198.
Loubota Panzou, G.J., Monthe, F.K., Ligot, G., Julve, C., Doucet, J.-L., 2023. Actualisation du statut de vulnérabilité des espèces ligneuses exploitées en Afrique centrale. ULiège- Gembloux Agro-Bio Tech.
Louppe, D., Hamel, O., Jaffre, R., Roda, J.M., 2000. Etude coûts et bénéfices des plantations d'okoumé au Gabon, Projet forêts et environnement. CIRAD-Forêt, Montepellier, France.
Marien, J.-N., Mallet, B., Nouvelles perspectives pour les plantations forestières en Afrique centrale. Bois For. Trop. 282 (2004), 67–79.
Maus, L., 2018. L'enrichissement en trouées d'abattage: Un suivi des essais menés à CEB - Precious Woods (Gabon). Université de Liège - Gembloux Agro-Bio Tech, Gembloux.
Meunier, Q., Moumbogou, C., Doucet, J.-L., 2015. Les arbres utiles du Gabon. Les Presses agronomiques de Gembloux, Gembloux, Belgium.
Midoko Iponga, D.M., Mpikou, R.G.J., Loumeto, J., Picard, N., The effect of different anthropogenic disturbances on litterfall of a dominant pioneer rain forest tree in Gabon. Afr. J. Ecol. 58 (2019), 281–290, 10.1111/aje.12696.
Morin-Rivat, J., Fayolle, A., Favier, C., Bremond, L., Gourlet-Fleury, S., Bayol, N., Lejeune, P., Beeckman, H., Doucet, J.-L., 2017. Present-day central African forest is a legacy of the 19th century human history. eLife e20343, 1–18. https://doi.org/10.7554/eLife.20343.
Nasi, R., Billand, A., van Vliet, N., Managing for timber and biodiversity in the Congo Basin. For. Ecol. Manag. 268 (2012), 103–111, 10.1016/j.foreco.2011.04.005.
Ndonda Makemba, R., 2023. Autécologie de Cylicodiscus gabunensis Harms au Gabon (PhD Dissertation). Université de Liège - Gembloux Agro-Bio Tech, Gembloux, Belgium.
Nichols, J.D., Wagner, M.R., Agyeman, V.K., Bosu, P., Cobbinah, J.R., Influence of artificial gaps in tropical forest on survival, growth, and Phytolyma lata attack on Milicia excelsa. For. Ecol. Manag. 110 (1998), 353–362.
Nichols, J.D., Ofori, D.A., Wagner, M.R., Bosu, P., Cobbinah, J.R., Survival, growth and gall formation by Phytolyma lata on Milicia excelsa established in mixed-species tropical plantations in Ghana. Agric. For. Ent 1 (1999), 137–141, 10.1046/j.1461-9563.1999.00014.x.
Onguene, N.A., Tsimi, J.P.M., Balla, M.J.E., Statut mycorhizien de l'okoumé (Aucoumea klaineana Pierre) en régénération artificielle au sud Cameroun. Tropicultura 20 (2002), 104–108.
Ouédraogo, D.-Y., Beina, D., Picard, N., Mortier, F., Baya, F., Gourlet-Fleury, S., Thinning after selective logging facilitates floristic composition recovery in a tropical rain forest of Central Africa. For. Ecol. Manag. 262 (2011), 2176–2186, 10.1016/j.foreco.2011.08.009.
Pangou, S.V., Maury-Lechon, G., Moutanda, A., Monodominant forests of Aucoumea klaineana and Terminalia superba in the Chaillu forest (SW Congo, Africa). Polish Botanical. Journal 48 (2003), 145–162.
Poorter, L., Growth responses of 15 rain-forest tree species to a light gradient: the relative importance of morphological and physiological traits. Funct. Ecol. 13 (1999), 396–410, 10.1046/j.1365-2435.1999.00332.x.
Poorter, L., Light-dependent changes in biomass allocation and their importance for growth of rain.pdf. Func. Ecol. 15 (2001), 113–123.
Poorter, L., Bongers, F., Leaf traits are good predictors of plant performance across 53 rain forest species. Ecology 87 (2006), 1733–1743 https://doi.org/10.1890/0012-9658(2006)87[1733:LTAGPO]2.0.CO;2.
Poorter, L., Kitajima, K., Carbohydrate storage and light requirements of tropical moist and dry forest tree species. Ecology 88 (2007), 1000–1011, 10.1890/06-0984.
Price, P.W., The Plant Vigor Hypothesis and Herbivore Attack. Oikos, 62, 1991, 244, 10.2307/3545270.
R Core Team. R: A language and environment for statistical computing. R Foundation for Statistical Computing, 2021 Vienna, Austria.
Ruiz Pérez, M., Ezzine De Blas, D., Nasi, R., Sayer, J.A., Sassen, M., Angoué, C., Gami, N., Ndoye, O., Ngono, G., Nguinguiri, J.-C., Nzala, D., Toirambe, B., Yalibanda, Y., Logging in the Congo Basin: A multi-country characterization of timber companies. For. Ecol. Manag. 214 (2005), 221–236, 10.1016/j.foreco.2005.04.020.
Saint-Aubin, G. de, 1963. La forêt du Gabon, CTFT. ed. Nogent-sur-Marne.
Sheil, D., Salim, A., Chave, J., Vanclay, J., Hawthorne, W.D., Illumination-size relationships of 109 coexisting tropical forest tree species. J. Ecol. 94 (2006), 494–507, 10.1111/j.1365-2745.2006.01111.x.
Swaine, M.D., Whitmore, T.C., On the definition of ecological species groups in tropical rain forests. Vegetatio 75:1–2 (1998), 81–86.
Tosso, F., Évolution et adaptation fonctionnelle des arbres tropicaux: le cas du genre Guibourtia Benn, 2018, Faculté Universitaire des Sciences Agronomiques de Gembloux, Gembloux, Belgium (PhD Thesis).
Ugwu, J.A., Prospects of botanical pesticides in management of Iroko gall bug, Phytolyma fusca (Hemiptera, Psylloidea) under laboratory and field conditions. JoBAZ, 82, 2021, 24, 10.1186/s41936-021-00223-0.
Ugwu, J.A., Omoloye, A.A., Effects of Net Barrier and Synthetic Insecticides on Phytolyma lata (Homoptera: Psyllidae) Infestation, Growth and Survival of Milicia excelsa in the Field. J. Entomol. 11 (2014), 218–224, 10.3923/je.2014.218.224.
Ugwu, J.A., Omoloye, A.A., Biology of Iroko Gall Bug, Phytolyma lata Scott. (Homoptera; Psylidae) on Milicia excelsa (Welw) C.C. Berg. J. Entomol. 11 (2014), 34–41, 10.3923/je.2014.34.41.
Ugwu, J.A., Omoloye, A.A., Perception on the Constraints to Propagation of Iroko (Milicia excelsa) (WELW) C.C. BERG in South West Nigeria. Res. J. For. 9 (2015), 48–57, 10.3923/rjf.2015.48.57.
Van Gemerden, B.S., Shu, G.N., Olff, H., 2003. Recovery of conservation values in Central African rain forest after logging and shifting cultivation. Biodviersity and Conservation 12, 1553–1570.
Vancutsem, C., Achard, F., Pekel, J.-F., Vieilledent, G., Carboni, S., Simonetti, D., Gallego, J., Aragão, L.E.O.C., Nasi, R., Long-term (1990–2019) monitoring of forest cover changes in the humid tropics. Sci. Adv., 7, 2021, eabe1603, 10.1126/sciadv.abe1603.
Veneklaas, E.J., Poorter, L., Inherent variation in plant growth. Physiological mechanisms and ecological consequences. Growth and Carbon Partitioning of Tropical Tree Seedlings in Contrasting Light Environments, 1998, Backhuis Publishers, Leiden: The Netherlands, 337–361.
Waag, H., Duplaquet, L., Observations nouvelles sur l'Okoumé du Gabon. jatba 16 (1936), 982–990, 10.3406/jatba.1936.5688.
Wadsworth, R.M., Lawton, J.R.S., The effect of light intensity on the growth of seedlings of some tropical tree species. J. West Afr. Sci. Assoc., 1968, 211–214.
Wagner, M.R., Cobbinah, J.R., Ofori, D.A., Companion planting of the nitrogen-fixing Gliricidia sepium with the tropical timber species Milicia excelsa and its impact on the gall forming insect Phytolyma lata. Dynamics of forest herbivory: quest for pattern and principle. For. Serv. Gen. Tech. Rep. NC-183. North Central For. Exp., 1996.
White, L., 1998. Aucoumea klaineana. The IUCN Red List of Threatened Species [WWW Document]. IUCN Red List of Threatened Species. URL https://dx.doi.org/10.2305 (accessed 1.13.20).
White, L., Oslisly, R., Abernethy, K., Maley, J., L'Okoumé ( Aucoumea klaineana): expansion et déclin d'un arbre pionnier en Afrique centrale atlantique au cours de l'Holocène. Servant, M., Servant-Vildary, S., (eds.) Dynamique à long terme des écosystèmes forestiers intertropicaux, 2000, UNESCO, Paris, France, 399–411.
White, M.G., 1964. Research in Nigeria on the Iroko Gall Bug (Phytolyma sp.): Being a Report to the Director of Forest Research on Investigation on Gall Bug (Phytolyma sp.) Injury to Iroko Tree (Chlorophora sp.). Federal Ministry of Information, Lagos.
Wise, M.J., Abrahamson, W.G., Beyond the compensatory continuum: environmental resource levels and plant tolerance of herbivory. Oikos 109 (2005), 417–428, 10.1111/j.0030-1299.2005.13878.x.
Wise, M.J., Abrahamson, W.G., Effects of resource availability on tolerance of herbivory: a review and assessment of three opposing models. Am. Nat. 169 (2007), 443–454, 10.1086/512044.
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