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Although the Congo River Basin contains the second largest tropical rainforest in the world, tropical Africa has fewer tree census plots than tropical Asia or America. Thus, more data are needed to describe species richness and diversity. We conducted a tree census to reveal the species richness and composition of a middle-altitude forest in Moukalaba-Doudou National Park, Gabon. We set a 150×150-m plot (2°3.2'S, 10°25.0'E) at an altitude of 220 m. All trees >10 cm in diameter at breast height (DBH) were marked, and the DBH of each was measured. We recorded 988 trees, 692 (70.0 %) of which were fully identified to 63 species. Among the rest, 267 trees (27.0 %) were classified into 27 genera, and 22 trees (2.23 %) were classified into 10 families. The 6 most common species accounted for 50.6 % (500 trees) of the total number of trees: Dichostemma glaucescens (Euphorbiaceae), Diospyros sp. 1 (Ebenaceae), Strombosia pustulata (Olacaceae), Synsepalum longecuneatum (Sapotaceae), Staudtia kamerunensis var. gabonensis (Myristicaceae) and Pausinystalia macroceras (Rubiaceae). The remaining 86 species had <10 trees per ha, and 42 species of these had <1 tree per ha on average. These low-density species reflect a high-diversity forest.

Species composition of a middle altitude forest in Moukalaba-Doudou National Park, Gabon