Article Sidebar
Published:
Jan 14, 2019Keywords:
Species diversity species dominance IITA Forest Reserve Shannon Weiner index Simpson index
Article Details
Issue
Section
Articles
Copyright: © 2017 The College of Forestry, Wildlife and Tourism.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form, or by any means electronic, mechanical, photocopying, recording or otherwise without prior permission from the College of Forestry, Wildlife and Tourism, SUA.
Main Article Content
Species composition and diversity in IITA Forest Reserve, Ibadan, Oyo State, Nigeria
Abstract
Assessment of plant species composition
and diversity of International Institute of
Tropical Agriculture (IITA) Forest Reserve,
Ibadan, Nigeria was carried out to facilitate
forest conservation and restoration. Two
transects, each measuring 500m long were
laid systematically for the study. Next, ten
25m x 25m sampling plots were demarcated
on each transect for enumeration and
identification of trees, shrubs and climbers.
Further, 1m x1m subplots were demarcated
for enumeration and identification of herbs
and lianas. Shannon-Wiener diversity and
Simpson indexes were used to assess species
diversity, evenness indices and richness.
Species richness in the Reserve was: trees
(58), shrubs (26), climbers (15), herbs (6)
and lianas (4). Species diversity (H´) and
species evenness (E) were: trees (3.18,
0.41), shrubs (2.97, 0.72), climbers (2.31,
0.67), herbs (1.36, 0.78), and lianas (0.73,
0.69), respectively. Stand density was 1255
trees/ha while basal area was 23.10m2ha-1.
There was a decrease in the number of
individual trees in various diameter classes
as size increased. The Forest Reserve was
dominated by Malvaceae, Leguminosae,
Apocynaceae, Euphorbiaceae, and Moraceae
families. Newbouldia laevis, Sphenocentrum
jollyanum, Acacia ataxacantha,
Chromolaena odorata, and Cnestis
ferruginea were the most abundant trees,
shrubs, climbers, herb and lianas,
respectively. Species population structure
indicated high species diversity; therefore,
management plan should be put in place for
species conservation.
and diversity of International Institute of
Tropical Agriculture (IITA) Forest Reserve,
Ibadan, Nigeria was carried out to facilitate
forest conservation and restoration. Two
transects, each measuring 500m long were
laid systematically for the study. Next, ten
25m x 25m sampling plots were demarcated
on each transect for enumeration and
identification of trees, shrubs and climbers.
Further, 1m x1m subplots were demarcated
for enumeration and identification of herbs
and lianas. Shannon-Wiener diversity and
Simpson indexes were used to assess species
diversity, evenness indices and richness.
Species richness in the Reserve was: trees
(58), shrubs (26), climbers (15), herbs (6)
and lianas (4). Species diversity (H´) and
species evenness (E) were: trees (3.18,
0.41), shrubs (2.97, 0.72), climbers (2.31,
0.67), herbs (1.36, 0.78), and lianas (0.73,
0.69), respectively. Stand density was 1255
trees/ha while basal area was 23.10m2ha-1.
There was a decrease in the number of
individual trees in various diameter classes
as size increased. The Forest Reserve was
dominated by Malvaceae, Leguminosae,
Apocynaceae, Euphorbiaceae, and Moraceae
families. Newbouldia laevis, Sphenocentrum
jollyanum, Acacia ataxacantha,
Chromolaena odorata, and Cnestis
ferruginea were the most abundant trees,
shrubs, climbers, herb and lianas,
respectively. Species population structure
indicated high species diversity; therefore,
management plan should be put in place for
species conservation.
