• Jetsada Wongprom Faculty of Forestry, Kasetsart University 50 Ngamwongwan Road. Ladyao Chatuchak, Bangkok, 10900 Thailand
  • Somporn Maelim Department of Silviculture, Faculty of Forestry, Kasetsart University, Bangkok 10900, Thailand
  • Wasan Chandaeng Forestry Research Center, Faculty of Forestry, Kasetsart University, Bangkok 10900, Thailand
  • Sakhan Teejuntuk Department of Silviculture, Faculty of Forestry, Kasetsart University, Bangkok 10900, Thailand
  • Monthathip Sommeechai Department of Silviculture, Faculty of Forestry, Kasetsart University, Bangkok 10900, Thailand
  • Decha Duangnamon Andaman Coastal Research Station for Development, Faculty of Fisheries, Kasetsart University, Bangkok 10900, Thailand




abandoned mining area, aboveground biomass, Acacia mangium, growth, merchantable volume, thinning


Thinning is an important practice for promoting growth and maintaining forest plantation for wood production from the remaining trees. In this study, thinning was carried out in a naturally regenerated 8-year-old Acacia mangium plot in the Phangnga Forestry Research Station. Three thinning schemes, with 175 (T1), 300 (T2) and 600 (T3) remaining trees/ha, were compared with the control (no thinning) of 831 trees/ha. The diameter at breast height (DBH) and height (H) of the trees were measured. The differences in growth, current annual increment (CAI), aboveground biomass, and stem volume (V) were analyzed. We observed that the thinning of A. mangium increased the growth rate, with the DBH being clearly affected by thinning. CAIDBH increased significantly, with the DBH class of thinned A. mangium plots also improving after thinning. The stem volume and aboveground biomass of T3 plot was similar to the control plot after thinning. In addition, the number of large saw logs was the highest in T3 plot. The large saw logs can be used for multi-utilization and have a high value. These results suggest that thinning can promote stem growth, and increase the proportion of large saw logs in naturally regenerated A. mangium stands.


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Author Biography

Jetsada Wongprom, Faculty of Forestry, Kasetsart University 50 Ngamwongwan Road. Ladyao Chatuchak, Bangkok, 10900 Thailand

Researcher at Faculty of Forestry, Kasetsart University


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How to Cite

Wongprom, J., Maelim, S., Chandaeng, W., Teejuntuk, S., Sommeechai, M., & Duangnamon, D. (2023). EFFECT OF THINNING ON GROWTH AND WOOD PRODUCTION OF NATURALLY REGENERATED 8-YEAR-OLD ACACIA MANGIUM WILLD. PLANTATION ON ABANDONED MINING AREA, SOUTHERN THAILAND . BIOTROPIA, 30(3), 308–317. https://doi.org/10.11598/btb.2023.30.3.1919