Abstract
Specific gravity is an important variable in determining forest biomass and trees adaptation against environmental factors. The purpose of this study is to estimate the specific gravity value of wood of five pioneer trees species in Biological Education and Research Forest Andalas University (HPPB) and its relationship to growth rate and water content. Observation was conducted for five important species in HPPB; Macaranga gigantea, Pternandra echinata, Macaranga triloba, Eurya acuminata, Dillenia sp. The relationship between specific gravity to growth rate and water content were analyzed by using the Spearman correlation test. From this study, we found the specific gravity of the five species ranged from 0.55-0.74 and wood water content ranged from 0.45-0.65 g/cm 3 . The highest specific gravity value was found in Dillenia sp, while the highest water content was found in Macaranga gigantea . Relative Diameter Growth Rate of five tree species observed ranged from 0.017 cm/cm/year to 0.047 cm/cm/year. We found a negative correlation between specific gravity and RDGR (r-value = -0.106) and specific gravity and water content (r-value = -0.453) but not significant.
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