Allometric equations for estimating biomass of community forest tree species in Madiun, Indonesia

Abstract

Abstract. Wirabuana PYAP, Setiahadi R, Sadono R, Lukito M, Martono DS, Matatula J. 2020. Allometric equations for estimating biomass of community forest tree species in Madiun, Indonesia. Biodiversitas 21: 4291-4300. The capability of community forests for offsetting carbon emissions highly depends on their biomass production. Unfortunately, the measurement of tree biomass in community forests using a destructive method is expensive and time-consuming. It is also almost impossible to conduct this method for all trees in the observation area. Therefore, the development of allometric equations is essential to support tree biomass estimation in community forests. This study was designed to construct specific models for predicting individual tree biomass in community forests, located in Madiun, Indonesia. We destructively sampled approximately 120 trees from four different species (30 trees for each species), i.e., Falcataria moluccana, Melia azedarach, Swietenia macrophylla, and Tectona grandis. For every tree sample, the measurement of biomass was conducted in each tree’s component, namely roots, stem, branches, and leaves. The allometric equations were developed with regression analysis using predictor variables, like diameter at breast height (D), squared diameter at breast height combined with tree height (D2H), as well as D and H separately. Results found that for four species, the mean biomass in the stem was 50.3%, followed by branches 25.4%, roots 15.9%, and leaves 8.3%. The best equation for estimating biomass in every component and total of four species was different. However, our study showed that the equation lnŶ = -3.037 + 1.430 lnD + 1.684 was reliable to estimate total individual tree biomass of four species in the surveyed area since this model had accuracy of 90.8%. Referring to these findings, we recommended the utilization of an allometric equation as an alternative method for facilitating more efficient biomass measurement in the community forests.

Carbon storage and energy production of Eucalyptus urophylla developed in dryland ecosystems at East Nusa Tenggara

“…This finding indicated approximately 90% of biomass from sample trees was accumulated in the stem. Trees generally allocate biomass in stem since it aims to optimize the translocation process for water, nutrients, and photosynthate (Wirabuana et al, 2020). This trend is generally found in every wood species in the different types of forest ecosystems.…”

“…The fresh weight of every component was measured using a hanging balance in the field with an accuracy of 0.1 kg. Afterwards, around 500 g sub-sample from each part was brought to the laboratory for drying (Wirabuana et al, 2020). The drying process was done using an oven at 70 °C for 48 hours before being weighted for biomass determination (Hakamada et al, 2017;.…”

Comparison of individual tree aboveground biomass estimation in community forests using allometric equation and expansion factor in Magetan, East Java, Indonesia

“…Testing three allometric models to measure aboveground biomass. Each tree component and the total of each species used several independent variables to formulate the equation, namely diameter at breast height (D), diameter squared at chest height combined with tree height (D2H), and D and H separately (Xue et al 2016;Altanzagas et al 2019;Wirabuana et al 2020). The detailed equations for constructing those models presented below:…”

“…In this study, tree diameter categorized into four classes, i.e., smaller than 10 cm, 10−20 cm, 21−30 cm, and bigger than 30 cm. Constructed the classification of tree diameter based on the previous study, which focused on developing an allometric model in community forests in Indonesia (Wirabuana et al 2020). The implementation of destructive sampling was done step by step in a chronological manner (Figure 2).…”

“…In this case, community forests expected to stabilize timber supply for industry development and minimize greenhouse gas emissions in the atmosphere (Setiahadi 2017). However, the fundamental role of community forests for carbon reduction highly depends on their productivity, wherein the accumulation of forest biomass plays an essential contribution in this process (Wirabuana et al 2020). Several kinds of literature explain that biomass production is an attribute of forest ecosystems with a principal function in a biogeochemical cycle, mainly related to the carbon cycle (Reichstein et al 2019;de Andrés 2019;Bouriaud et al 2019;Nunes et al 2020).…”