Abstract
Dipterocarp trees are ecologically and commercially important in Southeast Asian tropical rainforests. For sustainable management of forest ecosystems and conservation of biodiversity, it is essential to establish plantation methods ensuring that genetic variation of the planted trees is equivalent to that in natural forests. The genetic diversity and differentiation of Shorea leprosula and Shorea parvifolia on plantations managed by a private-sector forestry company in Indonesia and those in natural populations were compared using microsatellite markers. Genetic diversity in the planted populations was as high as that in the natural populations. No clear genetic differences between each planted population and the natural forest populations were found. The genetic variation present in planted S. leprosula and S. parvifolia populations did not appear to deteriorate in the planting system implemented in Indonesia, known as Tebang Pilih Tanam Jalur (TPTJ). These results indicate that the current plantation method practiced in the region is suitable for maintaining the original genetic composition and achieving sustainable use of tropical rainforests.