Stability Assessment and Composition of Tree Species in Nigerian University
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Wind remains a strong abiotic agent associated with damages of forest trees. The vulnerability of a tree to windthrow is highly influenced by the ratio of tree total height to its stem diameter (RHD). However, RHD has been identified as an index and measure of tree and stand stability. This study assessed the stability and composition of open grown tree species in the University of Ibadan, Nigeria. Diameter at breast height (Dbh) and total height (THt) of one hundred and thirty-nine (139) trees species with Dbh ≥5.0 cm found within three departments of the University were measured. A total of 36 species from 17 families were identified with Myrtaceae and Combretaceae families having highest (28.8% and 21.6%, respectively) numbers of tree. RHD was found to have negative correlation with all the tree growth variables investigated except THt. However, this study reveals that about 79 % of the trees found in the study area had RHD <80, indicating stable and low risk or susceptibility to windthrow, wind-induced bending and breakage. Hence, trees with RHD >80 (21%) were recommended for felling as they pose threat to human life and properties in the study area.
-  Moore, J.R. 2000. Differences in maximum resistive bending moments of Pinusradiata trees grown on a range of soil types. For. Ecol. Manage. 135: 63–71
-  Rudnicki, M., Silinus, U. and Lieffers, V.J. 2004. Crown cover is correlated with relative density, tree slenderness and tree height in lodge pole pine. Forest Science 50(3): 356-363.
-  Wang, Y., Titus S. J. and Lemay V. M. 1998. Relationship between tree slenderness coefficients and tree or stand characteristics for major species in Boreal Mixed Forest. Canadian Journal of Forest Research, 28 (8): 1171-1183.
-  Eguakun F.S., Oyebade BA. 2015. Linear and nonlinear slenderness coefficient models for Pinus caribaea (Morelet) stands in Southwestern Nigeria. J Agric.Vet. Sci. 8(3): 26-30.
-  Adeyemi, A.A. and Adesoye, P.O. 2016. Tree slenderness coefficient and percent canopy cover in Oban Group Forest, Nigeria, Journal of Natural Sciences Research. 6(4): 9-17
-  Budeanu, M. and Şofletea, N. 2013. Stem and crown characteristics of Norway Spruce (Piceaabies L. Karst) Populations from Romanian Carpathians. Northern Botany and Horticultural Agrobotany 41(2): 593-600.
-  Oyebade, B.A., Eguakun, F. S. and Egberibin, A. 2015. Tree slenderness coefficient (TSC) and tree growth characteristics (TGCS) for Pinus caribaea in Omo Forest Reserve, Nigeria, Journal of Environmental Science, Toxicology and Food Technology.Vol.9, Issue 3 Ver. II: 56-62.
-  Becquey, J., and P. Riou-Nivert. 1987. The existence of "stability zones" of the stands. Consequences on the management. Revue ("Les Chablis". L'existence de" zones de stabilité" des peuplements. Conséquences sur la gestion. Revue) Forestière Française, 4, fascicule thématique" Les Chablis".
-  Navratil, S., Brace, L.G., Sauder, E.A. and Lux, S. 1994. Silvicultural and harvesting options to favour mature White Spruce and Aspen regeneration in Boreal Mixedwoods Can. For. Serv. North. For Cent. Inf. Rep. No. NOR-X-337
-  Sharma, R.P., Vacek, Z. and Vacek, S. 2016. Modeling individual tree height to diameter ratio for Norway spruce and European beech in Czech Republic, Trees 30(6) DOI: 10.1007/s00468-016-1425-2
-  Liu, X., Silins, U., Lieffers, V.J. and Man, R.Z. 2003. Wind, bending and thinning, affect the hydraulic conductivity of conifer stems. Canadian Journal of Forest Research 33, 1295-1300.
-  Schütz, J-P. Götz, M., Schmid, W. and Mandallaz, D. 2006. Vulnerability of spruce (Picea abies) and beech (Fagus sylvatica) forest stands to storms and consequences for silviculture. Eur J For Res. 125: 291–302
-  Urata, T., Shibuya, M., Koizumi, A. Torita, H., and Cha, J. 2011. Both stem and crown mass affect tree resistance to uprooting. J For Res 17: 65–71
-  Valinger, E. and Fridman, J. 2011. Factors affecting the probability of wind throw at stand level as a result of Gudrun winter storm in southern Sweden. For Ecol Manage 262: 398–403
-  Olajuyigbe, S. O., Akinyele A. O., Jimoh S. O. and Adegeye A. O. 2013. Tree species diversity in the Department of Forest Resources Management, University of Ibadan, Nigeria. African Journal for Sustainable Development. 3 (1): 124-135.
-  Ezenwenyi, J. U. and Chukwu, O. 2017.Effects of slenderness coefficient in crown area prediction for Tectona grandis Linn.f. in Omo Forest Reserve, Nigeria, Current Life Sciences. 3 (4): 65-71.
-  Faber, P. J. (2008): Stability of stands to wind: a theoretical approach. Ned. Bosbouwtijdschr. 47: 179–193.
-  Šmudla, R. 2004. Utilization of mathematical models and growth simulators for creating forest management plans and planning the tending felling. Journal of Forest Science 50(8): 374-381.
-  Slodicak, M. and Novak, J. 2006. Silvicultural measures to increase the mechanical stability of pure secondary Norway spruce stands before conversion. Forest Ecology and Management 224: 252-257.
-  Kontogiannia, A., Tsitsonia, T. andGoudelis, G. (2011). An index based on silvicultural knowledge for tree stability assessment and improved ecological function in urban ecosystems. Ecological Engineering 37: 914-919.
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