Early evaluation of Racosperma auriculiforme and R. mangium provenance trials on four sites in Zaire

• Published in: Forest ecology and management Vol. 78; no. 1-3; pp. 99 - 113
• Main Authors: Khasa, P.D., Li, P., Vallée, G., Magnussen, S., Bousquet, J.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-10-1995; Elsevier
• Subjects: Acacia; ACACIA AURICULIFORMIS; ACACIA MANGIUM; Agronomy. Soil science and plant productions; ANATOMIA DE LA PLANTA; ANATOMIE VEGETALE; Biological and medical sciences; BOIS; CARACTERISTICAS DEL SITIO; CRECIMIENTO; CROISSANCE; DENSIDAD; DENSITE; DENSITY; FACTEUR LIE AU SITE; Forestry; Fundamental and applied biological sciences. Psychology; Generalities. Production, biomass. Quality of wood and forest products. General forest ecology; Genetics and breeding of economic plants; GENOTYPE ENVIRONMENT INTERACTION; GRAINE; GROWTH; INTERACCION GENOTIPO AMBIENTE; INTERACTION GENOTYPE ENVIRONNEMENT; MADERA; PLANT ANATOMY; PROCEDENCIA; Production. Biomass; PROVENANCE; Provenance trial; Racosperma; SEEDS; SEMILLA; SITE FACTORS; SUPERVIVENCIA; SURVIE; SURVIVAL; Varietal selection. Specialized plant breeding, plant breeding aims; WOOD; Yield, quality, earliness, varia; ZAIRE; Zaire; Africa; Provenance trial; Racosperma; Growth; Acacia; Origin; Productivity; Wood; Tropical zone; Variety trial; Survival; Leguminosae; Genotype environment interaction; Dicotyledones; Angiospermae; Spermatophyta; Morphometry; Geographical variation; Acacia auriculiformis
• ISSN: 0378-1127; 1872-7042
• DOI: 10.1016/0378-1127(95)03593-6

We examined provenance variation in two Racosperma species (R. auriculiforme and R. mangium) on four test sites in Zaire. Seeds for the two species were obtained from Northern Territory and Queensland of Australia, Papua New Guinea, Indonesia, Congo and Zaire. Growth and morphological characters (height, diameter, number of stems, branch angle, stem straightness, volume and flowering), survival and wood specific gravity were measured at ages 3, 9, 15 and 21 months. Site effects were significant and significant provenance differences existed in all traits except branch angle. The rank of provenances changed across sites, indicating significant genotype × environment interactions. Correlations of field growth traits (diameter, height and volume) at different ages were positive but negatively correlated with nursery results. Clinal variation was observed, especially for survival rate. The Racosperma provenances with the greatest volume production were from Papua New Guinea. They are suited for reforestation programs in Zaire and other tropical countries sharing similar biogeoclimatic conditions. Additional genetic gains in growth and wood density could be obtained through selection and breeding of superior individuals from these provenances.