Publication Cover
Acta Botanica Gallica
Botany Letters
Volume 148, 2001 - Issue 3
231
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Original Articles

Trees diversity in the Nsork rain forest (Rio Muni, Equatorial Guinea)

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Pages 227-235 | Received 08 Mar 2000, Accepted 12 Feb 2001, Published online: 27 Apr 2013
 

Abstract

The Nsork rain forest is located at 150 km east of Bata (1° 14' N, 11° 01' E), in the continental region of Equatorial Guinea. Within the 6.7 km of transects, trees with DBH ≥ 30 cm were inventoried on 50 m wide (33.5 ha) and those with DBH ≥ 10 cm on 8 sections of 160 × 10 m (1.28 ha). The main emergents (366 individuals with DBH ≥ 70 cm) are: Aucoumea klaineana (3.1 stems/ha), Scyphocephalium mannii (1), Engomegoma gordonii (0.6), Coula edulis (0.5)…Among the DBH > 30 cm (3886 individuals), the more abundant species are three Burseraceae: Santiria trimera (14 stems/ha), Aucoumea klaineana (9) and Dacryodes macrophylla (9). The biodiversity assessment showed that this forest is very important for the conservation, moreover it is characterised by two species identified for the first time in Equatorial Guinea: Engomegoma gordonii (Olacaceae) and Stachyothyrsus staudtii (Caesalpiniaceae).

Résumé

La forêt dense de Nsork se trouve à 150 km à l'est de Bata (1° 14' N, 11° 01' E), dans la partie continentale de la Guinée Équatoriale. Les arbres à DBH ≥ 30 cm ont été répertoriés sur 50 m de large (33,5 ha), au sein de 6,7 km de transects, tandis que ceux à DBH ≥ 10 cm l'ont été sur huit tronçons homogènes de 160 m × 10 m (1,28 ha). En ne considérant que les DBH ≥ 70 cm (366 individus), on met en évidence les principaux émergents: Aucoumea klaineana (3,1 pieds/ha), Scyphocephalium mannii (1), Engomegoma gordonii (0,6), Coula edulis (0,5)…Parmi les DBH ≥ 30 cm (3886 individus), trois Burseraceae se démarquent par leur forte abondance: Santiria trimera (14 pieds/ha), Aucoumea klaineana (9) et Dacryodes macrophylla (9). L'estimation de la biodiversité a montré l'intérêt en terme de conservation de la forêt dense de Nsork, caractérisée en particulier par deux espèces rares identifiées pour la première fois en Guinée Équatoriale: Engomegoma gordonii (Olacaceae) et Stachyothyrsus staudtii (Caesalpiniaceae).

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