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]
Geography
Country: Nigeria
Coordinate: 6° 30' 0" N, 9° 38' 30" E
Latlng basis: 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)
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)
Environment
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"
Methods
Life forms: trees
Sites: 14
Site area: 2.8
Sampling methods: quadrat
Sample size: 808 individuals
Net or trap nights: 0
Size min: 10.0
Basal area status: per ha is
Basal area: 34.67
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)"
Metadata
Sample no: 2726
Contributor no: John Alroy
Enterer: John Alroy
Created: 2017-10-12 13:28:39
Modified: 2017-11-07 09:54:51
Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
72 species
9 singletons
total count 808
geometric series index: 98.7
Fisher's α: 19.11
geometric series k: 0.9435
Hurlbert's PIE: 0.9689
Shannon's H: 3.7945
Good's u: 0.9889
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