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The seedlings and saplings plant stage determines the successional secondary process. The estimation on above ground biomass (AGB) of seedling and sapling plant is needed to describe the role of cover crop in the secondary forest. The objective of this study was to develop allometric equations for accurate estimation of AGB for seedlings-saplings at the different stages of fallows. The study was carried out at sites with four stages of fallow period namely lands with fallow period of 3, 5, 10, and 20 years, respectively in Sarawak, East Malaysia. The AGB data of all selected seedlings and saplings with the different species within 100 sample quadrates were used to developed allometric equations for seedlings and saplings in each study site. This study proposed allometric equations to accurate estimation AGB of seedlings-saplings (Do of < 5 cm) particularly in 10 and 20 years of fallow ages. The developed allometric equations were suitable to applied in different ages of secondary forests. The results provide allometric equation of AGB for different ages of secondary forests under similar parent materials and land use history (slash and burn after shifting cultivation).

Allometric equation, biomass, sapling, secondary forest, seedling