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Vegetation assessment and forest dynamic study of various areas in Gabon from 2000 to 2018

Citation

Engone Obiang N L, Ngomanda A, Kenfack D (2019). Vegetation assessment and forest dynamic study of various areas in Gabon from 2000 to 2018. Version 1.4. Herbier National du Gabon. Sampling event dataset https://doi.org/10.15468/i8fwlf accessed via GBIF.org on 2022-06-30.

Description

Data are provided by Institut de Recherche en Ecologie Tropicale (IRET), Herbier National du Gabon and the Smithsonian Institution via the Rabi plot. Trees with diameter at breast height (dbh) ≥ 1cm or 10 cm was measured according the study site. The dbh is measured with a diametric tape at approximately 1.3 m from ground, avoiding lianas growing on the trunk or above buttresses and stilt roots.

Sampling Description

Study Extent

Data were collected from different projects related to vegetation assessment and forest dynamic studies of various areas in Gabon. Those areas were: Monts de Cristal, Sibang (Estuaire); Bagombé, Kouma, Leke, Okouma (Haut Ogooué) ; Haut Abanga (Moyen Ogooué), Dango, Dibwangui, Dondon-Mobi, Mandji, Mouila, Ndendé, Ovala, Waka, Yombi (Ngounié) ; Ipassa, Ivindo, Koungou, Zadié (Ogooué Ivindo) ; Rabi (Ogooué Maritime); Bitam (Woleu-Ntem) and Lastourville (Ogooué Lolo).

Sampling

The presented data come from either permanent or non-permanent plots. • The 1 ha permanent plots from the National parks of Monts de Cristal and Waka were established according to the standardized methodology describe in Sunderland et al (2004) and Balinga et al (2006). • The 1 ha-plots of the IRET had been divided into 100 quadrats of 10m x 10m (see Picard and Gourlet-Fleury 2008). • The 25 ha-plot of Smithsonian in Rabi was subdivided into 625 quadrats of 20 m × 20 m, with elevation recorded at the 676 grid corners. Plot establishment followed the Smithsonian-ForestGEO standard methods (Condit 1998; Anderson-Teixeira et al. 2015; Memiaghe et al. 2016). • In the non-permanent rectangular or circular plots, trees were not tagged or located. Identification of trees were done directly on the trees with dbh ≥10 cm.

Quality Control

BRAHMS, XAMPP were used for quality control. These data were of high quality because they were subject of numerous scientific publications.

Method steps

  1. Different steps were described in the following papers: - Condit (1998) - Sunderland et al (2004) - Balinga et al (2006) - Picard et Gourlet-Fleury 2008) - Anderson-Teixeira et al. (2015) - Memiaghe et al. (2016)

Taxonomic Coverages

These data are inventory data from 414 plots that contain 224191 trees including 722 species, 339 genera and 74 families.
  1. Achariaceae
    rank: family
  2. Anacardiaceae
    rank: family
  3. Anisophylleaceae
    rank: family
  4. Annonaceae
    rank: family
  5. Apocynaceae
    rank: family
  6. Aptandraceae
    rank: family
  7. Araliaceae
    rank: family
  8. Arecaceae
    rank: family
  9. Asparagaceae
    rank: family
  10. Asteraceae
    rank: family
  11. Bignoniaceae
    rank: family
  12. Burseraceae
    rank: family
  13. Calophyllaceae
    rank: family
  14. Cannabaceae
    rank: family
  15. Cardiopteridaceae
    rank: family
  16. Centroplacaceae
    rank: family
  17. Chrysobalanaceae
    rank: family
  18. Clusiaceae
    rank: family
  19. Combretaceae
    rank: family
  20. Connaraceae
    rank: family
  21. Coulaceae
    rank: family
  22. Ctenolophonaceae
    rank: family
  23. Cucurbitaceae
    rank: family
  24. Dichapetalaceae
    rank: family
  25. Dipterocarpaceae
    rank: family
  26. Ebenaceae
    rank: family
  27. Erythropalaceae
    rank: family
  28. Erythroxylaceae
    rank: family
  29. Euphorbiaceae
    rank: family
  30. Fabaceae
    rank: family
  31. Gentianaceae
    rank: family
  32. Huaceae
    rank: family
  33. Humiriaceae
    rank: family
  34. Hypericaceae
    rank: family
  35. Icacinaceae
    rank: family
  36. Irvingiaceae
    rank: family
  37. Ixonanthaceae
    rank: family
  38. Lamiaceae
    rank: family
  39. Lauraceae
    rank: family
  40. Lecythidaceae
    rank: family
  41. Loganiaceae
    rank: family
  42. Malvaceae
    rank: family
  43. Melastomataceae
    rank: family
  44. Meliaceae
    rank: family
  45. Moraceae
    rank: family
  46. Myristicaceae
    rank: family
  47. Myrtaceae
    rank: family
  48. Ochnaceae
    rank: family
  49. Octoknemaceae
    rank: family
  50. Pandaceae
    rank: family
  51. Passifloraceae
    rank: family
  52. Peraceae
    rank: family
  53. Peridiscaceae
    rank: family
  54. Phyllanthaceae
    rank: family
  55. Picrodendraceae
    rank: family
  56. Polygalaceae
    rank: family
  57. Primulaceae
    rank: family
  58. Putranjivaceae
    rank: family
  59. Rhamnaceae
    rank: family
  60. Rhizophoraceae
    rank: family
  61. Rubiaceae
    rank: family
  62. Rutaceae
    rank: family
  63. Salicaceae
    rank: family
  64. Santalaceae
    rank: family
  65. Sapindaceae
    rank: family
  66. Sapotaceae
    rank: family
  67. Simaroubaceae
    rank: family
  68. Stemonuraceae
    rank: family
  69. Strombosiaceae
    rank: family
  70. Thomandersiaceae
    rank: family
  71. Urticaceae
    rank: family
  72. Violaceae
    rank: family
  73. Vochysiaceae
    rank: family

Geographic Coverages

Data were collected in the following areas of Gabon: Monts de Cristal, Sibang (Estuaire); Bagombé, Kouma, Leke, Okouma (Haut Ogooué); Haut Abanga (Moyen Ogooué), Dango, Dibwangui, Dondon-Mobi, Mandji, Mouila, Ndendé, Ovala, Waka, Yombi (Ngounié) ; Ipassa, Ivindo, Koungou, Zadié (Ogooué Ivindo); Rabi (Ogooué Maritime); Bitam (Woleu-Ntem) and Lastourville (Ogooué Lolo).

Bibliographic Citations

  1. - Balinga, M., Sunderland, T., Walters, G., Issembe, Y., Asaha, S., & Fombod, E. 2006. A vegetation assessment of the Waka national park, Gabon. CARPE report - Engone Obiang, N.L., Ngomanda, A., White, L., Jeffery, K.J., Chézeaux, E., & Picard, N. 2012. A growth model for azobé, Lophira alata in Gabon. Bois et Forêts des Tropiques 65–72. - Memiaghe, H.R., Lutz, J.A., Korte, L., Alonso, A., & Kenfack, D. 2016. Ecological Importance of Small-Diameter Trees to the Structure, Diversity and Biomass of a Tropical Evergreen Forest at Rabi, Gabon. PLOS ONE 11: e0154988. - Obiang, N.L.E., Ngomanda, A., Hymas, O., Chézeauxl, É., & Picard, N. 2014. Diagnosing the demographic balance of two light-demanding tree species populations in central Africa from their diameter distribution. Forest Ecology and Management 313: 55–62. - Obiang, N.L.E., Ngomanda, A., Mboma, R., Nzabi, T., Ngoye, A., Atsima, L., Ndjélé, L., Mate, J.-P., Lomba, C., & Picard, N. 2010. Spatial pattern of central African rainforests can be predicted from average tree size. Oikos 119: 1643–1653. - Obiang, N.L.E., Ngomanda, A., White, L.J., Jeffery, K.J., Chézeaux, É., & Picard, N. 2013. Disentangling the effect of size and competition: a growth model for Aucoumea klaineana. Annals of forest science 70: 241–249. - Picard, N., & Gourlet-Fleury, S. 2008. Manuel de référence pour l’installation de dispositifs permanents en forêt de production dans le Bassin du Congo. COMIFAC. - Sunderland, T., Walters, G., & Issembe, Y. 2004. Étude préliminaire de la végétation du parc national de Mbé, Monts de Cristal, Gabon. Herbier National du Gabon, Limbe Botanical & Zoological Gardens, Missouri Botanical Garden, Forests Resources and People, Smithsonian National Zoological Park, Libreville, Gabon, Carpe report. -

Contacts

Nestor Laurier Engone Obiang
originator
position: Curator
Herbier National du Gabon
BP 1156
Libreville
Estuaire
GA
Telephone: +24102461946
email: engoneobiangnestor@gmail.com
homepage: http://vmtropicar-proto.ird.fr/gabon/
Nestor Laurier ENGONE OBIANG
metadata author
position: Curator
Herbier National du Gabon
BP 1156
Libreville
Estuaire
GA
Telephone: +24102461946
email: engoneobiangnestor@gmail.com
Alfred Ngomanda
metadata author
position: Director
IRET
BP 13354
Libreville
Estuaire
GA
email: ngomanda@yahoo.fr
homepage: https://pfbc-cbfp.org/actualites/items/IRET-PFBC.html
David Kenfack
metadata author
position: Africa Program Coordinator
ForestGEO | Smithsonian Tropical Research Institute
10th & Constitution Avenue NW
Washington
DC 20560-0166
US
Telephone: 202-633-4706
email: KenfackD@si.edu
homepage: http://www.forestgeo.si.edu/
Nestor Laurier ENGONE OBIANG
publisher
position: Curator
Herbier National du Gabon
BP 1156
Libreville
Estuaire
GA
Telephone: +24102461946
email: engoneobiangnestor@gmail.com
homepage: http://vmtropicar-proto.ird.fr/gabon/
Alfred Ngomanda
content provider
position: Director
Institut de Recherche en Ecologie Tropicale
BP 13354
Libreville
Estuaire
GA
email: ngomanda@yahoo.fr
homepage: https://pfbc-cbfp.org/actualites/items/IRET-PFBC.html
David Kenfack
content provider
position: Africa Program Coordinator
Smithsonian Tropical Research Institute
10th & Constitution Avenue NW
Washington DC
DC 20013-7012
US
Telephone: 202-633-4706
email: KenfackD@si.edu
homepage: http://www.forestgeo.si.edu/
Nestor Laurier Engone Obiang
administrative point of contact
position: Curator
Herbier National du Gabon
BP 1156
Libreville
Estuaire
GA
Telephone: +24102461946
email: engoneobiangnestor@gmail.com
homepage: http://vmtropicar-proto.ird.fr/gabon/
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