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Development of Organic Carbon Sequestration Models for Dipterocarpus Turbinatus, Acacia Auriculiformis and Eucalyptus Camaldulensis and their Potentialit 448 Key words: Sequestration, Allometric model, Dipterocarpus turbinatus Gaertn f., Acacia auriculiformis A Cunn. and Eucalyptus camaldulensis Dehn. Introduction Global climate change is one of the burning issues of present time where carbon is acting the key role. The trapping and build-up of heat in the lower atmosphere near the planet’s surface. Some of the heat flowing back towards space from the Earth’s surface is absorbed by water vapour, carbon dioxide (CO2), methane (CH4), and other gases in the atmosphere. If the atmospheric concentrations of these gases rise, then theory predicts that the average temperature of the lower atmosphere will gradually increase. The greenhouse effect in part explains the temperature differences of Mars, Venus and Earth. (Gifford, 2000). Moreover there is growing local and international concern over the increase of carbon in the form of carbon dioxide (CO2) in the atmosphere over the last few decades. Forests play an important role in the carbon cycle, removing carbon dioxide from the atmosphere and storing it as carbon in plant material and soil. So creating forests can provide a relatively cost-effective way of carbon sink. Organic carbon sequestration potential varies from species to species. Generally fast growing exotic species can sequester more carbon than that of indigenous species. So to fulfil organic carbon sequestration objective it is also important to choose suitable species. The most accurate method for calculating the amount of carbon stored in a tree is to fell the tree, measure its total biomass and analyse all parts of the tree for carbon content. However, this is not a practical method for calculating carbon stored in whole forests. Allometric relationships, which relate an easy-to-measure tree variable such as stem diameter to carbon stored in the tree, total height to carbon stored in the tree and diameter at breast height and total height together to carbon stored in the tree, are some principal method for estimating carbon stocks of forest and woodland ecosystems. In this study, some relationships have been developed to calculate sequestered organic carbon for three species viz. Dipterocarpus turbinatus, Acacia auriculiformis and Eucalyptus camaldulensis in respect of total height, diameter at breast height and combination of these two. Materials and Methods The study was conducted on three prominent species viz. (Dipterocarpus turbinatus, Acacia auriculiformis and Eucalyptus camaldulensis) growing vigorously in the Chittagong University campus. Random sampling was carried out for data and sample collection. Five sample plots of 10m x 10m size were taken for each species. Total height and diameter at breast height (DBH) of each individual within the sample plots were measured with the help of Spigel Relaskop and measuring tape respectively. One representative individual from each sample plot was harvested and all components viz root, main bole, primary branch, secondary branch and leaves & twigs were separated. Weight of each component was taken with the help of a field balance. Samples from all components were collected for analysis. Samples from the harvested individuals were taken into an envelope and kept those at 60ºC temperature in the oven until two adjacent weights attain to a constant value. Thus moisture percentages were determined. The oven-dried samples were then grinded. Porcelain crucibles were washed with 6N HCL and distilled water and dried in an oven at 65ºc for 1 hour. Less than 1g amounts of samples were taken into pre-weight crucibles. The crucibles were taken inside the cool furnace. After adjustment of the furnace at 550ºc, heating was increased slowly and after reaching at 550ºc, ignition was continued for 1 hour. The crucibles were cooled slowly keeping them inside the furnace. After cooling, the crucibles with ash were weighted and percentage of ash was calculated. Then organic carbon percentage was determined. Relationship was tested considering total organic carbon content (kg) and diameter at breast height (cm), total organic carbon content (kg) and total height (m) and total organic carbon content (kg) and diameter at breast height (cm) along with height (m) by using SPSS. The best fit model was accepted to estimate organic carbon of the respective
449 Md. Shahadat Hossain and Gouri Rani Banik species based on coefficient of determination (r 2 ) and level of significance (p). Organic carbon sequestration potentials of the studied species have been determined using sample data from the plantations. Results and discussion Organic carbon percentage of dry biomass found in different components of the studied species varies from component to component, i.e., all components viz. leaf, secondary branch, primary branch, main stem and root do not contain same percentage of organic carbon of their respective dry biomass. In case of Dipterocarpus turbinatus leaf component shows the highest (57.50%) and secondary branch component shows the lowest (53.13%) value of organic carbon percentage of their respective dry biomass. Total organic carbon percentage of other components according to their respective dry biomass is close to the maximum and minimum value. In case of Acacia auriculiformis leaf component shows the highest (57.42%) and main stem component shows the lowest (54.64%) value of organic carbon percentage of their respective dry biomass. Total organic carbon percentage of other components according to their respective dry biomass is very close to the maximum and minimum value. In case of Eucalyptus camaldulensis leaf component shows the highest (57.69%) and secondary branch component shows the lowest (55.45%) value of organic carbon percentage of their respective dry biomass. Total organic carbon percentage of other components according to their respective dry biomass is also very close to the maximum and minimum value. The study revealed that the leaf organic carbon percentage is higher for every studied species. Reason may be stated as organic carbon accumulation in the tree from the atmospheric carbon dioxide occurs in the leaf through photosynthesis process. The carbon content in trees considered as 50% of the dry biomass (IPCC, 1999; Brown, 1997). In the study carbon percentage for individual component is found above 50% for all studied species. Moreover leaf organic carbon percentage for every studied species is higher of which cause has been mentioned above. Table: Organic carbon percentage of dry biomass of different components Species Components organic carbon (%) of dry biomass Root Stem Pr.Br Sec.Br. Leaves &Twigs Dipterocarpus turbinatus 55.91 54.06 55.91 53.13 57.50 Acacia auriculiformis 55.91 54.64 55.68 55.10 57.42 Eucalyptus camaldulensis 56.14 56.03 55.56 55.45 57.69 Proportionate organic carbon distribution of different components of the studied species Among the organic carbon percentage of different plant components of the studied three species stem organic carbon of Acacia auriculiformis is maximum (72.34% of total organic carbon) in compared to Dipterocarpus turbinatus (61.84% of total organic carbon) and Eucalyptus camaldulensis (68.94% of total organic carbon). In case of root organic carbon it is found that percentage organic carbon contribution to the total organic carbon of Dipterocarpus turbinatus (12.76% of the total organic carbon) and Acacia auriculiformis (11.11% of total organic carbon) is comparatively close to each other than that of Eucalyptus camaldulensis (9.44% of total organic carbon). Contribution to the total organic carbon of primary branch of Dipterocarpus turbinatus and Eucalyptus camaldulensis is almost same to each other (11.15% and 11.28% respectively). But in case of Acacia auriculiformis it is much lower in proportion (7.93% only). Organic carbon contribution of secondary branch to the total organic carbon is least in all the studied species. In case of Acacia auriculiformis and Eucalyptus camaldulensis secondary branch organic carbon percentage is near about same (4.29% and 4.51% of the total organic carbon). In Dipterocarpus turbinatus it is found 6.98% of the total organic carbon.Leaf organic carbon for a certain period is largely dependent upon the phenological behavior of
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A Comparative Analysis of Gibberell
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Nutritive Evaluation of Some Trees
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Investigation of Complex Formation
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