The data of aboveground biomass in the mixed deciduous forest and the teak plantation at the ages of 6, 10, 15, 23, and 24 years old were collected during 5 –15 September 2003. The data collection procedures were carried on as follows.
2.1 All trees with DBH greater than 4.5 cm in 40 x 40 m2 and 52 x 52 m2 plots were measured by using diameter tape for DBH and Haga hypsometer for height of each tree. The height of 10 trees of each plot was measured to estimate the teak of each age including the height of other plants both in the teak plantation and in the mixed deciduous forest. Every plant species was identified and recorded. Also, every cluster of bamboo in the selected areas were counted and identified species. All bamboo stems were then counted and DBH and height were measured. Afterward, 5 stems of each bamboo species were randomly cut and separated into individual parts (leaves, branches, and stems). Later, these samples would be put into the drying oven to find percentage of moisture content in order to calculate dry weight. 2.2 Saplings and shrubs with DBH less than 4.5 cm but higher than 1.3 m in 2 x 2 m2 plots were cut at ground level. Stems, branches and leaves were separately weighed and sorted out the species of those trees. Samples of each part of individual tree were randomly picked and weighed fresh weight. Later, these samples would be put into the oven to find percentage of moisture content in order to calculate dry weight. 2.3 All trees shorter than 1.3 m, seedlings