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The University of the Philippines (UP) is the country’s national university. This premier institution of higher learning was established in 1908 and is now a university system composed of eight constituent universities and one autonomous college spread throughout 17 campuses in the archipelago.



Biomass and carbon sequestration of Gmelina arborea Roxb.  [2007]

Tandug, L.M., Ecosystems Research and Development Bureau - Department of Environment and Natural Resources, College, Laguna (Philippines);


One of the most pressing problems nowadays is climate change brought about by the increasing levels of greenhouse gases, particularly carbon dioxide (CO2), in the atmosphere. Trees take up carbon dioxide from the atmosphere and store the carbon in their biomass (roots, stems and foliage) through the process of photosynthesis. This study was conducted to provide the basic information for accurate and reliable estimations of the biomass and amount of carbon being sequestered in yemane (Gmelina arborea Roxb.) trees. Above ground biomass were determined for 50 yemane trees with ages 2-12 years from seven provinces in Regions 3, 5 and 6. The total green biomass of a yemane tree ranged from 2.6 to 666.4 kg. The average tree contained 68.56 percent of the total dry weight in the merchantable stem, 6.45 percent in the foliage and 24.98 percent in the top wood, branches and twigs. On the average, 6.85 percent of the stem (trunk) dry weight was bark and 61.71 percent was wood. Prediction equations using allometric models were developed for estimating the fresh and oven dry weights of the whole tree and its components using easily measured variables such as diameter and height. Based on the carbon analyses done on the tree samples taken, the oven dried stemwood, bark, branches and leaves have 46.06 percent, 43.53 percent, 44.48 percent, and 44.89 percent total carbon in their biomass, respectively. On the average, a yemane tree has 44.73 percent stored carbon in its dry mass.