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Shorea leprosula Miq. and Shorea selanica (Lam.) Blume are fastgrowing plants, and can be used as a rehabilitation plant. Plant adaptability can be seen from the growth in diameter. Furthermore, rehabilitation plants have the potential to store carbon stocks which can support Indonesia's Forestry And Other Land Use (FOLU) Net Sink 2030 program. This study aims to analyze diameter growth and estimate carbon stocks stored in 8-yearold S. leprosula and S. selanica species in unproductive forest area KHDTK Haurbentes, Bogor. Furthermore, the data collection of diameter was conducted by census, while carbon stock estimation used allometric equations. The diameter distribution of S. leprosula and S. selanica was normally distributed. The normal diameter distribution is defined as the highest number of frequencies around the mean value. The results of the normality test of S. leprosula and S. selanica have normal diameter distribution data, which indicate that these species have good adaptability in unproductive forest areas. Moreover, the incremental growth of S. leprosula diameter is 1,38 cm, while the diameter increment of S. selanica is 1,19 cm. The carbon stock of S. leprosula is 4,72 tons/ha while S. selanica is 8,32 tons/ha. S. leprosula and S. selanica have good adaptability. Thus, they can be used as plants to rehabilitate unproductive forests and store potential carbon stocks. [ABSTRACT FROM AUTHOR]

Shorea leprosula is one of the tree species within Dipterocarpaceae Family, which is a major source of timber production. The species has been planted massively in Gunung Dahu Research Forest (GDRF) in Leuwiliang, Bogor. Gunung Dahu Research Forest is a manmade dipterocarp forest that has varying slope classes, topography, and canopy cover. Furthermore, natural regeneration is an important ecological factor in assessing the ability of forest regeneration, including in a plantation forest. Therefore, it is necessary to know the effect of slope and canopy cover on the regeneration of S. leprosula in order to characterize what factors support and constrain the naturally regenerating forest of Gunung Dahu Research Forest. Regeneration capacity of the species was observed in purposive plots which have been recorded for their flowering events. Seedlings were grouped into seedlings and saplings. It was measured by census method on every slopes. Meanwhile, variable observed included number of available seedlings at each slope category slope with its canopy cover, height and diameter of seedlings, and litter thickness. The results show that a flat slope with shady canopy cover has the highest capacity of seedlings and the best growth. The uneven distribution of height and diameter indicates the need for silviculture action, such as, maintenance. [ABSTRACT FROM AUTHOR]