Oban Forest Reserve
Basic information
Sample name: Oban Forest Reserve

Reference: H. I. Aigbe and G. E. Omokhua. 2015. Tree species composition and diversity in Oban Forest Reserve, Nigeria. Journal of Agricultural Studies 3(1):10-24 [ER 2456]
Country: Nigeria

Coordinate: 5° 30' 0" N, 8° 37' 30" E
Basis of coordinate: stated in text as range
Geography comments: "within longitude 8°20′ E and 8°55′ E and latitudes 5°00′ N and 6°00′ N"
the reserve as "an area of 742.55km2... elevation rises from the river valleys to over 1, 000 m in mountainous areas"
altitude is 1200 to 2200 ft based on Jewell and Oates (1969, Zoologica Africana)
Habitat: tropical/subtropical moist broadleaf forest
Protection: forest reserve
Substrate: ground surface
MAT: 27.0
MAP: 2750.0
Habitat comments: "Temperatures are generally high (average around 27oC) and vary little throughout the year with the annual range of the monthly average temperature varying only between 3º and 3.5ºC... Annual rainfall is generally, between 2, 500mm- 3, 000mm... The presence of Thaumatococcus danielli, Musanga cecropioides and Aframomum latifolium in the study area, is an indication that the vegetation has been disturbed in the recent past, but currently displays signs of recovery"
Life forms: trees
Sites: 14
Site area: 2.800
Sampling methods: quadrat
Sample size: 808
Minimum size: 10.0cm dbh
Basal area: 34.6700 per ha
Sampling comments: "Multistage sampling technique was used to establish primary (1000m x 1000m), secondary (1000m x 50m) and tertiary (40m x 50m) plots. Fourteen tertiary plots were randomly established within the secondary plots and trees randomly selected for measurement within the tertiary plots (0.20 ha)"
Sample: 2726
Contributor: John Alroy
Enterer: John Alroy
Created: 2017-10-12 13:28:39
Modified: 2017-11-07 20:54:51
Abundance distribution
72 species
9 singletons
total count 808
extrapolated richness: 83.1
Fisher's α: 19.110
geometric series k: 0.9435
Hurlbert's PIE: 0.9689
Shannon's H: 3.7945
Good's u: 0.9889
Each square represents a species. Square sizes are proportional to counts.
Lannea welwitschii15
Poga oleosa18
Pachypodanthium staudtii4
Xylopia aethiopica6
Alstonia boonei3
Funtumia elastica23
"Futumia elastica"
Voacanga africana5
Bombax buonopozense7
Ceiba pentandra3
Canarium schweinfurthii14
Afzelia africana18
Berlinia grandiflora5
Brachystegia eurycoma12
Daniellia ogea22
Detarium macrocarpum2
Distemonanthus benthamianus1
Erythrophleum suaveolens8
Gossweilerodendron balsamiferum20
Hylodendron gabunense5
Oxystigma manni5
Terminalia ivorensis23
Terminalia superba16
Diospyros crassiflora41
Agauria salicifolia1
Klainedoxa gabonensis9
Ricinodendron africanum6
Uapaca heudelotii53
Homalium spp.18
Allanblackia floribunda1
Mammea africana7
Irvingia gabonensis20
Hypodaphnis zenkeri3
Petersianthus macrocarpus1
Anthocleista djalonensis4
Carapa procera41
Entandrophragma cylindricum4
Guarea thompsonii6
Khaya ivorensis2
Lovoa trichilioides2
Albizia ferruginea8
Albizia gummifera6
Albizia zygia9
Cylicodiscus gabunensis1
Parkia bicolor5
Piptadeniastrum africanum8
Tetrapleura tetraptera3
Antiaris welwitschii4
Ficus lutea6
Ficus mucuso8
Milicia excelsa11
Treculia africana5
Treculia obovoidea1
Coelocaryon preussii2
Pycnanthus angolensis34
Staudtia kamerunensis gabonensis62
"Staudtia stipitata"
Lophira alata19
Strombosia pustulata10
Amphimas pterocarpoides7
Baphia nitida4
Pentaclethra macrophylla1
Pterocarpus osun13
Pterocarpus soyauxii1
Anopyxis klaineana2
Mitragyna stipulosa6
Nauclea diderrichii1
Corynanthe macroceras4
"Pausinystalia macrocera"
Quassia gabonensis6
"Hannoa klaineana"
Cola sp.3
Sterculia oblonga33
Triplochiton scleroxylon12
Celtis zenkeri37
Vitex grandifolia22