Abstract
Biomass and carbon stock in a forested areas are now prime important indicators of forest management and climate change mitigation measures. But the accurate estimation of biomass and carbon in trees of forests is now a challenging issue. In most cases, pantropical and regional biomass models are used frequently to estimate biomass and carbon stock in trees, but these estimations have some uncertainty compared to the species-specific allometric biomass model. Acacia nilotica, Casuarina equisetifolia and Melia azedarach have been planted in different areas of Bangladesh considering the species-specific site requirements. While Barringtonia acutangula and Pongamia pinnata are the dominant tree species of the freshwater swamp forest of Bangladesh. This study was aimed to develop species-specific allometric biomass models for estimating stem and above ground biomass (TAGB) of these species using the non-destructive method and to compare the efficiency of the derived biomass models with the frequently used regional and pantropical biomass models. Four Ln-based models with diameter at breast height (DBH) and total height (H) were tested to derive the best fit allometric model. Among the tested models, Ln (biomass) = a + b Ln (D) + c Ln (H) was the best-fit model for A. nilotica, M. azedarach, B. acutangula and P. pinnata and Ln (biomass) = a + b Ln (D2H) was best-fit for C. equisetifolia. Finally, the derived best-fit species-specific TAGB models have shown superiority over the other frequently used pantropical and regional biomass models in relation to model efficiency and model prediction error.
Highlights
Bangladesh is facing rapid deforestation and fragmentation of natural forest to meet the basic needs of the additional population as in the rest of the world, which results in only 12.8% forest cover of the total country area (GoB, 2019)
Barringtonia acutangula, Casuarina equisetifolia, Melia azedarach and Pongamia pinnata have been planted in various zones of the country considering the species-specific site requirements
Casuarina equisetifolia is native to the southern Bangladesh and A. nilotica is an introduced species, but both are suitable for plantation in sandy coastal lands and slop of coastal embankment
Summary
Bangladesh is facing rapid deforestation and fragmentation of natural forest to meet the basic needs of the additional population as in the rest of the world, which results in only 12.8% forest cover of the total country area (GoB, 2019). The natural forest area declined rapidly, but the overall tree canopy coverage increased modestly from 2000 to 2014 in Bangladesh (Potapov et al, 2017). This improvement has been made possible due to the overall progress of the afforestation programs across the country. Barringtonia acutangula, Casuarina equisetifolia, Melia azedarach and Pongamia pinnata have been planted in various zones of the country considering the species-specific site requirements. Melia azedarach is an exotic species which is planted for roadside avenue trees in dry areas and in hill zones in Bangladesh (Das & Alam, 2001; Hossain, 2015; GoB, 2019)
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