The problem in implementing exploitation method with the Indonesian Selective Cutting and Planting System (TPTI) at production forest area in Mt.Tambora, Sumbawa island was low regeneration of duabanga (Duabanga moluccana Blume) on logged over areas and substituted with another less non commercial wood species. The growth of D. moluccana regeneration required enough sunlight on open area (intolerant species). The implementation of Indonesia Strip Cutting and Planting System (TJTI) make to open

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... reas will be created better growth on D. moluccana regeneration. The objective of this study is to obtain some information about the effect of D. moluccana regeneration on TJTI silviculture system. The study was conducted with Completely Block Randomized Design method using 4 treatments of silviculture system and 3 groups/repetitions i.e. no enrichment planting and maintenance on TJTI, enrichment planting and maintenance on TJTI, no enrichment planting and no maintenance on TJTI, enrichment planting and maintenance on TPTI. The wide of production strip is 170 m and conservation strip is 30 m. D. moluccana enrichment planting with spacing 10 m x 10 m was conducted 1 year after exploitation. The maintenance was conducted every 6 months in the first year, then one every year until 3 years old. The study result on silviculture system of TJTI showed that 4 years old after exploitation, it could increase the height, diameter, and survival of natural regeneration and enrichment planting population of D. moluccana. The growth rate of height, diameter, and survival of natural regeneration increased i.e. 47. 40%, 86.68%, 183.2% respectively and enrichment planting 47.26%, 88.1%, 272.3% respectively. Regeneration of D. moluccana, 74% comes from natural regeneration and 26% comes from enrichment planting. The maintenance doesn't increasing height and the population of regeneration, but it′s increasing the diameter. The exploitation with TJTI and TPTI silviculture system could decrease soil fertility and micro climate.