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IJSTR >> Volume 3- Issue 10, October 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Tree Species Diversity And Density Pattern In Afi River Forest Reserve, Nigeria

[Full Text]



Aigbe H.I , Akindele S.O, Onyekwelu J, C



Index Terms: Afi River Forest Reserve, floristic composition, species diversity, tree density



Abstract: Afi River Forest Reserves in Cross River State, Nigeria, was assessed for tree species diversity and density pattern. Multistage (3 stage) sampling technique was adopted for data collection. 10 tertiary plots were randomly established within the secondary plots and trees randomly selected for measurement within the tertiary plots (0.20 ha). Growth data including: diameter at breast height (dbh, at 1.3m); diameters over bark at the base, middle and top; merchantable height and total height were collected on trees with dbh ≥ 10 cm in all the 10 tertiary sample plots. The results indicate that an average number of trees per hectare of 323 (68 species) were encountered in the study area. Population densities of the tree species ranged from 1 to 29 ha-1. This means, some tree species encountered translates to one stand per hectare. Pycnanthus angolensis was the most abundant with a total of 29 tree/ha. The basal area/ha in the study area was 102.77m2 and the species richness index obtained was 10.444, which indicate high species richness. The value of Shannon-Wiener Index (HI) is 3.827 which is quite high. The results show that the forest reserve is a well-stocked tropical rainforest in Nigeria. The high species diversity and the relative richness in timber species of the forest reserve does not correlate well with the abundance because the abundance of each of the species was quite low and density poor. However, the presence of higher percentage of the lower diameter tree in the forest reserve indicates that the forest reserve is vigour and healthy.



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