Development of allometric equations for estimating above-ground liana biomass in tropical primary and secondary forests Malaysia
Addo-Fordjour P; Rahmad ZB
International Journal of Ecology
The study developed allometric equations for estimating liana stem and total above-ground biomass in primary and secondary forests in the Penang National Park Penang Malaysia. Using biomass-diameter-length data of 60 liana individuals representing 15 species allometric equations were developed for liana stem biomass and total above-ground biomass (TAGB). Three types of allometric equations were developed: models fitted to untransformed weighted and log-transformed (log10) data. There was a significant linear relationship between biomass and the predictors (diameter length and/or their combinations). The same set of models was developed for primary and secondary forests due to absence of differences in regression line slopes of the forests (ANCOVA:). The coefficients of determination values of the models were high (stem: 0.861 to 0.990; TAGB: 0.900 to 0.992). Generally log-transformed models showed better fit (Furnival\\\s index FI < 0.50) than the other models (FI > 0.5). A comparison of the best TAGB model in this study (based on FI) with previously published equations indicated that most of the equations significantly overestimated TAGB of lianas. However a previous equation from Southeast Asia estimated TAGB similar to that of the current equation. Therefore regional or intracontinental equations should be preferred to intercontinental equations when estimating liana biomass.