Allometric Model for Predicting Aboveground Biomass and Carbon Stock of Acacia Plantations in Sarawak, Malaysia

Nur Syazni Adam, Ismail Jusoh

Abstract


Allometric equations estimating biomass and carbon stock for Acacia mangium in Malaysia have been developed. However, in previous studies they were obtained from small trials or experimental plots. In this study, models were proposed to quantify the aboveground biomass as well as the amounts of stored and sequestered carbon in two planting variants, namely second generation Acacia mangium and Acacia hybrid plantations that were approximately 10 years old. Linear, power, exponential, and logarithmic functions were fitted for aboveground biomass using trunk diameter at breast height (DBH) as the independent variable. The best fit model for estimation of total aboveground biomass was in the form of a power function y = aDb. Application of the developed model yielded total aboveground biomasses of Acacia hybrid and second generation Acacia mangium of 113.3 Mha-1 and 178.9 Mha-1, respectively. This study indicated that 10-year-old second generation Acacia mangium and Acacia hybrid had sequestered 30.8 Mha-1 and 19.5 Mha-1, respectively, of CO2 annually. This study showed that the Acacia mangium plantation plays a role as a carbon sink. Thus, these forest plantations benefit the economy and also mitigate carbon emissions.

Keywords


Allometric model; Aboveground biomass; Acacia plantation; Carbon stock and sequestration

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