[en] During inventories of lesser-known timber species in eastern Gabon, a new Dialium morphospecies was discovered. To discriminate it from the two other 2–5 leaflets Dialium species, 25 leaf traits were measured on 45 trees (16 Dialium pachyphyllum, 14 Dialium lopense, 15 Dialium sp. nov.). Nine wood chemical traits, as well as infrared spectra, were also examined on harvestable trees (four Dialium pachyphyllum and four Dialium sp. nov.). This study revealed seven discriminant leaf traits that allowed to create a field identification key. Nine significant differences (five in sapwood and four in heartwood) in terms of wood composition were highlighted. The use of the PLS-DA technique on FT-IR wood spectra allowed to accurately identify the new morphospecies. These results provide strong support for describing a new species in this genus. Implications for sustainable management of its populations are also discussed.
Biwolé A.B. Ouédraogo D.-Y. Betti J.L. Picard N. Rossi V. Delion S. Lagoute P. Gourlet-Fleury S. Lejeune P. Doucet J.-L. Dynamique des populations d’azobé, Lophira alata Banks ex C. F. Gaertn., et implications pour sa gestion durable au Cameroun Bois Forets Des Trop. 2019 342 55 68 10.19182/bft2019.342.a31670
Karsenty A. Gourlet-Fleury S. Assessing Sustainability of Logging Practices in the Congo Basin’s Managed Forests: The Issue of Commercial Species Recovery Ecol. Soc. 2006 11 art26 10.5751/ES-01668-110126
FRM Vision Stratégique et Industrialisation de la Filière Bois dans les 6 Pays du Bassin du Congo, Horizon 2030 FRM Montpellier, France 2018
Doucet J.-L. L’alliance Délicate de la Gestion Forestière et de la Biodiversité dans les Forêts du Centre du Gabon Ph.D. Thesis Université de Liège, Gembloux Agro-Bio Tech Gembloux, Belgium 2003
Kleinschroth F. Gourlet-Fleury S. Sist P. Mortier F. Healey J.R. Legacy of logging roads in the Congo Basin: How persistent are the scars in forest cover? Ecosphere 2015 6 64 10.1890/ES14-00488.1
Edwards D.P. Magrach A. Woodcock P. Ji Y. Lim N.T.L. Edwards F.A. Larsen T.H. Hsu W.W. Benedick S. Khen C.V. et al. Selective-logging and oil palm: Multitaxon impacts, biodiversity indicators, and trade-offs for conservation planning Ecol. Appl. 2014 24 2029 2049 10.1890/14-0010.1
Cerutti P.O. Lescuyer G. Tacconi L. Eba’a Atyi R. Essiane E. Nasi R. Tabi Eckbil P.P. Tsanga R. Social impacts of the Forest Stewardship Council certification: An assessment in the Congo basin Int. For. Rev. 2017 19 50 63 10.1505/146554817822295920
Burivalova Z. Hua F. Koh L.P. Garcia C. Putz F. A Critical Comparison of Conventional, Certified, and Community Management of Tropical Forests for Timber in Terms of Environmental, Economic, and Social Variables Conserv. Lett. 2017 10 4 14 10.1111/conl.12244
FSC FSC Forest Stewardship Council Standard for the Congo Basin Forest Stewardship Council A.C. Bonn, Germany 2012
Putz F.E. Zuidema P.A. Synnott T. Peña-Claros M. Pinard M.A. Sheil D. Vanclay J.K. Sist P. Gourlet-Fleury S. Griscom B. et al. Sustaining conservation values in selectively logged tropical forests: The attained and the attainable Conserv. Lett. 2012 5 296 303 10.1111/j.1755-263X.2012.00242.x
Sist P. Piponiot C. Kanashiro M. Pena-Claros M. Putz F.E. Schulze M. Verissimo A. Vidal E. Sustainability of Brazilian forest concessions For. Ecol. Manag. 2021 496 119440 10.1016/j.foreco.2021.119440
Gérard J. Guibal D. Paradis S. Cerre J.-C. Tropical Timber Atlas Quae Versailles, France 2017
Bengono G.B. Souza A. Tosso F. Doucet R. Richel A. Doucet J.-L. Les Dialium de la région guinéo-congolaise (synthèse bibliographique) BASE 2021 25 172 191 10.25518/1780-4507.19114
Ruwet M. Caractérisations Morphologiques, Spectrales et Génétiques des Eyoum (Dialium spp.) Master’s Thesis Université de Liège, Gembloux Agro-Bio Tech Gembloux, Belgium 2021
Allaby M. A Dictionary of Ecology Oxford University Press Oxford, UK 2010
Wieringa J.J. MacKinder B.A. Novitates Gabonensis 79: Hymenostegia elegans and H. robusta spp. nov. (Leguminosae-Caesalpinioideae) from Gabon Nord. J. Bot. 2012 30 144 152 10.1111/j.1756-1051.2011.01260.x
Kenfack D. Sainge M.N. Chuyong G.B. Thomas D.W. The genus cola (Malvaceae) in Cameroon’s Korup national park, with two novelties Plant Ecol. Evol. 2018 151 241 251 10.5091/plecevo.2018.1410
Bissiengou P. Chatrou L.W. Wieringa J.J. Sosef M.S.M. Taxonomic novelties in the genus Campylospermum (Ochnaceae) Blumea J. Plant Taxon. Plant Geogr. 2013 58 1 7 10.3767/000651913X667817
De Azevedo Falcão M.J. De Freitas Mansano V. Dialium heterophyllum (Fabaceae: Dialioideae), a new tree species from the Amazon Phytotaxa 2020 477 47 59 10.11646/phytotaxa.477.1.3
Gérard J. Guibal D. Paradis S. Vernay M. Beauchêne J. Brancheriau L. Châlon I. Daigremont C. Détienne P. Fouquet D. et al. Tropix 7 CIRAD Montpelier, France 2011
TerEA Résumé du Plan D’aménagement. Compagnie Equatoriale des Bois. Precious Wood Gabon TerEA (Terre Environnement Aménagement) Marseille, France 2007
Van Soest P.J. Wine R.H. Use of Detergents in the Analysis of Fibrous Feeds. IV. Determination of Plant Cell-Wall Constituents J. AOAC Int. 1967 50 50 55 10.1093/jaoac/50.1.50
Van Soest P.J. Use of Detergents in the Analysis of Fibrous Feeds. II. A Rapid Method for the Determination of Fiber and Lignin J. AOAC Int. 1990 73 491 497 10.1093/jaoac/73.4.491
Chen H. Ferrari C. Angiuli M. Yao J. Raspi C. Bramanti E. Qualitative and quantitative analysis of wood samples by Fourier transform infrared spectroscopy and multivariate analysis Carbohydr. Polym. 2010 82 772 778 10.1016/j.carbpol.2010.05.052
Sluiter A. Hames B. Ruiz R.O. Scarlata C. Sluiter J. Templeton D. Determination of Ash in Biomass Renew Energy Lab. Golden, CO, USA Laboratory Analytical Procedure (LAP) Golden, CO, USA 2005
Sheppard P.R. Thompson T.L. Effect of Extraction Pretreatment on Radial Variation of Nitrogen Concentration in Tree Rings J. Environ. Qual. 2000 29 2037 2042 10.2134/jeq2000.00472425002900060042x
Gérard J. Paradis S. Thibaut B. Survey on the chemical composition of several tropical wood species Bois Forets Des Trop. 2019 342 79 91 10.19182/bft2019.342.a31809
Oreopoulou A. Tsimogiannis D. Oreopoulou V. Extraction of Polyphenols from Aromatic and Medicinal Plants: An Overview of the Methods and the Effect of Extraction Parameters Polyphenols in Plants Elsevier Amsterdam, The Netherlands 2019 243 259
Ainsworth E.A. Gillespie K.M. Estimation of total phenolic content and other oxidation substrates in plant tissues using Folin-Ciocalteu reagent Nat. Protoc. 2007 2 875 877 10.1038/nprot.2007.102
Engozogho Anris S.P. Bi Athomo A.B. Safou Tchiama R. Santiago-Medina F.J. Cabaret T. Pizzi A. Charrier B. The condensed tannins of Okoume (Aucoumea klaineana Pierre): A molecular structure and thermal stability study Sci. Rep. 2020 10 1773 10.1038/s41598-020-58431-7
Kucheryavskiy S. mdatools—R package for chemometrics Chemom. Intell. Lab. Syst. 2020 198 103937 10.1016/j.chemolab.2020.103937
Hobro A.J. Kuligowski J. Döll M. Lendl B. Differentiation of walnut wood species and steam treatment using ATR-FTIR and partial least squares discriminant analysis (PLS-DA) Anal. Bioanal. Chem. 2010 398 2713 2722 10.1007/s00216-010-4199-1
Wang S.N. Da Zhang F. Huang A.M. Zhou Q. Distinction of four Dalbergia species by FTIR, 2nd derivative IR, and 2D-IR spectroscopy of their ethanol-benzene extractives Holzforschung 2016 70 503 510 10.1515/hf-2015-0125
R Studio Team RStudio: Integrated Development for R. RStudio PBC Boston, MA, USA 2020
Hothorn T. Zeileis A. Partykit: A modular toolkit for recursive partytioning in R J. Mach. Learn. Res. 2015 16 3905 3909
Pomerantsev A.L. Acceptance areas for multivariate classification derived by projection methods J. Chemom. 2008 22 601 609 10.1002/cem.1147
Rohart F. Gauthier B. Signh A. Lê Cao K.A. mixOmics: An R package for omics feature selection and multiple data integration PLoS Comput Biol. 2017 13 e1005752 10.1371/journal.pcbi.1005752
Mahalanobis P.C. On the Generalised Distance in Statistics Proc. Natl. Inst. Sci. India 1936 2 49 55
Chong I.G. Jun C.H. Performance of some variable selection methods when multicollinearity is present Chemom. Intell. Lab. Syst. 2005 78 103 112 10.1016/j.chemolab.2004.12.011
Kassambara A. rstatix: Pipe-Friendly Framework for Basic Statistical Tests (v 0.7.0) R Project for Statistical Computing Vienna, Austria 2021
Grasel F.D.S. Ferrão M.F. Wolf C.R. Development of methodology for identification the nature of the polyphenolic extracts by FTIR associated with multivariate analysis Spectrochim. Acta—Part A Mol. Biomol. Spectrosc. 2016 153 94 101 10.1016/j.saa.2015.08.020 26296253
González-Peña M.M. Hale M.D.C. Rapid assessment of physical properties and chemical composition of thermally modified wood by mid-infrared spectroscopy Wood Sci. Technol. 2011 45 83 102 10.1007/s00226-010-0307-9
Yap M.G.S. Que Y.T. Chia L.H.L. FTIR characterization of tropical wood–polymer composites J. Appl. Polym. Sci. 1991 43 2083 2090 10.1002/app.1991.070431115
Popescu C.-M. Jones D. Kržišnik D. Humar M. Determination of the effectiveness of a combined thermal/chemical wood modification by the use of FT–IR spectroscopy and chemometric methods J. Mol. Struct. 2020 1200 127133 10.1016/j.molstruc.2019.127133
Backa S. Brolin A. Nilsson T. Characterisation of fungal degraded birch wood by FTIR and Py-GC Holzforschung 2001 55 225 232 10.1515/HF.2001.037
Shen D. Liu G. Zhao J. Xue J. Guan S. Xiao R. Thermo-chemical conversion of lignin to aromatic compounds: Effect of lignin source and reaction temperature J. Anal. Appl. Pyrolysis 2015 112 56 65 10.1016/j.jaap.2015.02.022
Trilokesh C. Uppuluri K.B. Isolation and characterization of cellulose nanocrystals from jackfruit peel Sci. Rep. 2019 9 16709 10.1038/s41598-019-53412-x
Abdul Latif M.H. Attiya H.G. Al–Abayaji M.A. Lignin FT-IR study of Iraqi date palm Phoenix dactylifera frond bases wood Plant Arch. 2019 19 327 332
Nuopponen M.H. Wikberg H.I. Birch G.M. Jääskeläinen A.S. Maunu S.L. Vuorinen T. Stewart D. Characterization of 25 tropical hardwoods with fourier transform infrared, ultraviolet resonance raman, and13C-NMR cross-polarization/magic- angle spinning spectroscopy J. Appl. Polym. Sci. 2006 102 810 819 10.1002/app.24143
Huang A. Zhou Q. Liu J. Fei B. Distinction of three wood species by Fourier transform infrared spectroscopy and two-dimensional correlation IR spectroscopy J. Mol. Struct. 2008 883–884 160 166 10.1016/j.molstruc.2007.11.061
Özgenç Ö. Durmaz S. Boyaci I.H. Eksi-Kocak H. Determination of chemical changes in heat-treated wood using ATR-FTIR and FT Raman spectrometry Spectrochim. Acta—Part A Mol. Biomol. Spectrosc. 2017 171 395 400 10.1016/j.saa.2016.08.026
Pasquet R.S. Classification infraspecifique des formes spontanees de Vigna unguiculata (L.) Walp. (Fabaceae) a partir de donnees morphologiques Bull. Du Jard. Bot. Natl. Belg. 1993 62 127 10.2307/3668271
Vandrot H. Nomenclature of the new caledonian genera arthroclianthus Baill. and nephrodesmus schindl. (Fabaceae-Desmodieae) Adansonia 2018 40 103 129 10.5252/adansonia2018v40a8
Rojo J.P. Studies in the Genus Dialium (Cassieae-Caesalpinioideae) Ph.D. Thesis Oxford University Oxford, UK 1982
Zimmerman E. Prenner G. Bruneau A. Floral ontogeny in Dialiinae (Caesalpinioideae: Cassieae), a study in organ loss and instability S. Afr. J. Bot. 2013 89 188 209 10.1016/j.sajb.2013.06.020
Bosco Mbagou J. Variabilité Intra-Arbre des Propriétés Physico-Mécaniques Et Chimiques du Tessmania Africana en Provenance du Gabon Ph.D. Thesis Université de Laval Québec, QC, Canada 2017
Lourenço A. Neiva D.M. Gominho J. Marques A.V. Pereira H. Characterization of lignin in heartwood, sapwood and bark from Tectona grandis using Py–GC–MS/FID Wood Sci. Technol. 2015 49 159 175 10.1007/s00226-014-0684-6
Adamopoulos S. Voulgaridis E. Passialis C. Variation of certain chemical properties within the stemwood of black locust (Robinia pseudoacacia L.) Eur. J. Wood Wood Prod. 2005 63 327 333 10.1007/s00107-005-0018-3
Lhate I. Cuvilas C. Terziev N. Jirjis R. Chemical composition of traditionally and lesser used wood species from Mozambique Wood Mater. Sci. Eng. 2010 5 143 150 10.1080/17480272.2010.484867
Doat J. Etude papetière de l’Okoumé. Essais de laboratoire, semi-industriels et industriels (1re partie) Bois Forets Des Trop. 1972 146 31 52
Nuopponen M.H. Birch G.M. Sykes R.J. Lee S.J. Stewart D. Estimation of wood density and chemical composition by means of diffuse reflectance mid-infrared fourier transform (DRIFT-MIR) spectroscopy J. Agric. Food Chem. 2006 54 34 40 10.1021/jf051066m
Martin A.R. Erickson D.L. Kress W.J. Thomas S.C. Wood nitrogen concentrations in tropical trees: Phylogenetic patterns and ecological correlates N. Phytol. 2014 204 484 495 10.1111/nph.12943
Gérardin P. Fritsch C. Cosgun S. Brennan M. Dumarçay S. Colin F. Gérardin P. Effet de la hauteur de prélèvement sur la composition quantitative et qualitative des polyphénols de l’écorce d’Abies alba Mill Rev. For. Française 2020 72 411 423 10.20870/revforfr.2020.5338
Bikoro Bi Athomo A. Engozogho Anris S.P. Safou-Tchiama R. Santiago-Medina F.J. Cabaret T. Pizzi A. Charrier B. Chemical composition of African mahogany (K. ivorensis A. Chev) extractive and tannin structures of the bark by MALDI-TOF Ind. Crops Prod. 2018 113 167 178 10.1016/j.indcrop.2018.01.013
Nisca A. Ștefănescu R. Stegăruș D.I. Mare A.D. Farczadi L. Tanase C. Comparative Study Regarding the Chemical Composition and Biological Activity of Pine (Pinus nigra and P. sylvestris) Bark Extracts Antioxidants 2021 10 327 10.3390/antiox10020327
Tchinda Saha J.-B. Abia D. Dumarç Ay S. Kor Ndikontar M. Gérardin P. Noah J.N. Perrin D. Antioxidant activities, total phenolic contents and chemical compositions of extracts from four Cameroonian woods: Padouk (Pterocarpus soyauxii Taubb), tali (Erythrophleum suaveolens), moabi (Baillonella toxisperma), and movingui (Distemonanthus benthamianus) Ind. Crops Prod. 2012 41 71 77
Poorter L. Leaf traits show different relationships with shade tolerance in moist versus dry tropical forests N. Phytol. 2009 181 890 900 10.1111/j.1469-8137.2008.02715.x
Sack L. Cowan P.D. Jaikumar N. Holbrook N.M. The ‘hydrology’ of leaves: Co-ordination of structure and function in temperate woody species Plant. Cell Environ. 2003 26 1343 1356 10.1046/j.0016-8025.2003.01058.x
Barnett J. Jeronimidis G. Wood Quality and Its Biological Basis Blackwell Publishing Ltd. Carlton, VIC, Australia 2003
Cruz N. Bustos C. Aguayo M.G. Cloutier A. Castillo R. THM densification of wood BioResources 2018 13 2268 2282
Dirol D. Deglise X. Durabilité des Bois et Problèmes Associés Hermès Science Paris, France 2001
Anouhe B.J.S. Niamké F.B. Faustin M. Virieux D. Pirat J.L. Adima A.A. Kati-Coulibaly S. Amusant N. The role of extractives in the natural durability of the heartwood of Dicorynia guianensis Amsh: New insights in antioxydant and antifungal properties Ann. For. Sci. 2018 75 15 10.1007/s13595-018-0691-0
Scalbert A. Tannins in Woods and Their Contribution to Microbial Decay Prevention Plant Polyphenols Springer Boston, MA, USA 1992 935 952
Akai S. Fukutomi M. Preformed Internal Physical Defenses How Plants Defend Themselves Horsfall J.G. Cowling E.B. Elsevier Amsterdam, The Netherlands 1980 139 159