Tree size diversity and carbon stock of Tectona grandis (Linn f.) standsin hilltop and valley-bottom of Omo forest reserve, Nigeria
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Competition for growth resources contributes to size hierarchy in tree populations. Competition hierarchy of trees is dependent on rate of growth and stages of stand development. However, competition hierarchy in tree population may not cause size symmetry in some stress habitats. Size structure and development of even- aged stand can be influenced by abiotic factors. The study investigated tree size structure and carbon stock of Tectona grandis stands in Valley-Bottom and Hilltop of Omo Forest Reserve. Ten-years-old Teak plantation was delineated into Hilltop and Valley-Bottom stands base on topography. Five (30m x 30m) sample plots were systematically demarcated in each of Hilltop and Valley-Bottom stands. Tree stems were enumerated and densities of both stands were estimated. Total height and diameter-at-breast height were measured using Spiegel Relaskop and Girth tape, respectively, and stem carbon was estimated. Inequality and diversity of stem size of both stands were evaluated. Data collected were analyzed using descriptive, correlation, regression analysis and t-test at α0.05. Stem density of Hilltop (1431.0 stems/ha) was higher than Valley-Bottom stands (1248.0 stems/ha). Mean stem diameter of Valley-Bottom were not significantly different from Hilltop stands.
Coefficient of determination (R2 ) of Height-Diameter allometry for Valley-Bottom (0.59) was higher than Hilltop stands (0.45). Diameter distribution of Valley-Bottom and Hilltop expressed bimodality and unimodality, respectively. Inequality was higher in Hilltop than Valley-Bottom for diameter. The stems of Hilltop and Valley-Bottom stands contributed 49.68% and 50.32% of total stem carbon, respectively. Elevation affected the stem size hierarchy and carbon stock distribution of Valley-Bottom and Hilltop habitats. Stems of Valley-Bottom stand could be a good option for carbon sequestration in Omo Forest Reserve.
Keywords: Competition hierarchy; Size symmetry; Elevation gradient; Tree height; Tree diameter
ID: 3623266