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Enhancement of carbon storage through the establishment of man-made forests has been
considered as a mitigation option to reduce increasing atmospheric CO2 levels. Therefore the present
study was carried out to estimate the biomass and carbon storages of the main stem of Eucalyptus
grandis using allometric relationships using the plantations of Nuwara Eliya and Badulla districts in Sri
Lanka. Tree diameter and total height were measured for the samples trees and stem volume was
estimated using a previously built individual model for the same species. Stem biomass was estimated
using core samples mid carbon was determined using Walkley-Black method. Finally the biomass
values were converted separately to the carbon values. Non-liner regression analysis was employed for
the construction of models which had age as the explanatory variable. Linear regression was used in
order to build die models to predict the above ground and stem biomass and carbon using volume as the
explanatory variable. For both linear and non-linear types, the model quality was tested using R2 and
fitted line plots. According to the results, stem biomass and carbon values at the 7th year were 110.8 kg
and 68.7 kg respectively. Stem biomass and caibon values at the 40* year were 1,095.8 kg and 679.4
kg respectively. Caibon content at the age 20 was 62.0% from the stem biomass. Exponential models
were proven to be better than the logistic models to predict the diameter, height, stem volume, biomass
and carbon with age. R2 values and the fitted line plots indicated that the selected models are of high
quality. Linear models built to predict die stem biomass and carbon using stem volume also showed the
Ugh accuracy of these models wUch had R2 values above 97.9%
