Allometric equation for aboveground biomass estimation of Galiniera saxifraga (Hochst.) Bridson in Gesha-Sayilem forest, southwestern Ethiopia


Tura Bareke
Admassu Addi


Abstract. Bareke T, Addi A. 2021. Allometric equation for aboveground biomass estimation of Galiniera saxifraga (Hochst.) Bridson in Gesha-Sayilem forest, southwestern Ethiopia. Asian J For 5: 76-82. There is limited information about the precise quantification of Aboveground Biomass (AGB) of species-specific allometric equations for shrubs and small trees. Thirty Galiniera saxifraga plants were selected to develop species-specific allometric biomass equations. Biometric parameters, including the diameter at the Breast Height (DBH), height and crown area were predictive variables that were measured for each individual plant. AGB was measured through a destructive method. The AGB was correlated to biometric variables using regression analysis. The species-specific allometric models, with DBH and crown area as predictors (DBH-crown area models), accounted for 90% of the variation in the AGB of G. saxifraga. The DBH-crown area model was adequate for predicting the AGB for G. saxifraga with the adjusted R2 value 0.9 and AIC values was 47.37. The specific allometric equation developed for the Gesha-Sayilem Afromontane forest can be used in similar moist forests in Ethiopia to implement Reduced Emission from Deforestation and Degradation (REDD+) activities to benefit the local communities from carbon trade.


Addi A, Demissew S, Soromessa T, Asfaw Z. 2019. Carbon Stock of the Moist Afromontane Forest in Gesha and Sayilem Districts in Kaffa Zone: An Implication for Climate Change Mitigation. Journal of Ecosystem & Ecography 9(1): 1-8.
Addi A, Soromessa T, Bareke T. 2020. Plant diversity and community analysis of Gesha and Sayilem Forest in Kaffa Zone, southwestern Ethiopia. Biodiversitas 21 (7): 2878-2888.
Addi A, Wakjira K, Bezabih A, Kelbessa K. 2014. Honeybee forages of Ethiopia. United Printers, Addis Ababa.
Adrien N, Djomo C, Chimi D. 2017. Tree allometric equations for estimation of above, below and total biomass in a tropical moist forest: Case study with application to remote sensing. Forest Ecology and Management 391: 184–193.
Ali A, Xu MS, Zhao YT, Zhang QQ, Zhou LL, Yang XD, Yan ER, 2015. Allometric biomass equations for shrub and small tree species in subtropical China. Silva Fennica 49 (4): 1-10.
Altanzagas B, Luo Y, Altansukh B, Dorjsuren C, Fang J, Hu H. 2019. Allometric Equations for Estimating the Above-Ground Biomass of Five Forest Tree Species in Khangai, Mongolia. Forests 10 (661): 1-17.
Ancelm MW, Edward ME, Luoga E, Ernest MR, Zahabu E, Santos SD, Sola G, Crete P, Henry M, Kashindye A. 2016. Allometric Models for Estimating Tree Volume and Aboveground Biomass in Lowland Forests of Tanzania. International Journal of Forestry Research 1-13.
Bareke T, Addi A. 2020. Bee flora diversity in different vegetation communities of Gesha-Sayilem forest in Kaffa Zone, southwestern Ethiopia. Plants and Environment 2(4): 138-148.
Brassard BW, Chen HYH, Bergeron Y. 2009. Influence of environmental variability on root dynamics in northern forests. Critical Reviews in Plant Sciences 28: 179–197.
Cavanaugh KC, Gosnell JS, Davis SL, Ahumada J, Boundja P, Clark DB, Mugerwa B, Jansen PA, Rovero F, Sheil D, Vasquez R, Andelman S. 2014. Carbon storage in tropical forests correlates with taxonomic diversity and functional dominance on a global scale. Global Ecology and Biogeography 23: 563–573.
Chave J, Andalo C, Brown S, Cairns MA, Chambers JQ, Eamus D, Yamakura T. 2005. Tree allometry and improved estimation of carbon stocks and balance in tropical Forests. Oecologia1 45: 87–99.
Chave J, Réjou-Méchain M, Búrquez A, Chidumayo E, Colgan MS, Delitti WB, Duque A, Eid T, Fearnside PM, Goodman RC, Henry M, Martínez-Yrízar A, Mugasha WA, Muller-Landau HC, Mencuccini M, Nelson BW, Ngomanda A, Nogueira EM, Ortiz-Malavassi E, Pélissier R, Ploton P, Ryan CM, Saldarriaga JG. 2014. Improved allometric models to estimate the aboveground biomass of tropical trees. Global Change Biology 20:3177– 3190.
Conti G, Enrico L, Casanoves F, Díaz S. 2013. Shrub biomass estimation in the semiarid Chaco forest: a contribution to the quantification of an underrated carbon stock. Annals of Forest Science 70: 515–524.
Djomo A, Ibrahima A, Saborowski J, Gravenhorst G. 2010. Allometric Equations for Biomass Estimations in Cameroon and Pan Moist Tropical Equations Including Biomass Data from Africa. Forest Ecology and Management 260 (10), 1873–1885.
Edae DD, Soromessa T. 2019. The accuracy of species?specific allometric equations for estimating aboveground biomass in tropical moist montane forests: case study of Albizia grandibracteata and Trichilia dregeana. Carbon Balance Management 14(18): 1-13.
Henry M, Picard N, Trotta C, Manlay RJ, Valentini R, Bernoux M, Saint-André L. 2011. Estimating tree biomass of sub-Saharan African forests: a review of available allometric equations. Silva Fennica p. 477-569.
Kuyah S, Dietz J, Muthuri C, Jamnadass R, Mwangi P, Coe R, Neufeldt H. 2012. Allometric equations for estimating biomass in agricultural landscapes: I. Aboveground biomass. Agriculture Ecosystems and Environment 15(8): 216 – 224.
Makungwa SD, Chittock A, Skole DL, Kanyama-Phiri GY, Woodhouse IH. 2013. Allometry for biomass estimation in Jatropha trees planted as boundary hedge in farmers’ fields. Forests 4: 218 – 233.
Maraseni TN, Cockfield G, Apan A, Mathers N. 2005. Estimation of Shrub Biomass: Development and Evaluation of Allometric Models Leading to Innovative Teaching Methods. International Journal of Business & Management Education. Special Issue: Postgraduate Research in Innovative Methods of Teaching & Learning: 17-32.
Nogueira SL, Soares BG, Ribeiro N, Sitoe A. 2018. Biomass allometric equation and expansion factor for a mountain moist evergreen forest in Mozambique. Carbon Balance and Management 13(23):1-16.
Oliveira SLJ, Pereira JMC, Carreiras JMB. 2011. Fire frequency analysis in Portugal (1975–2005), using Landsat-based burnt area maps. International Journal of Wildland Fire 21: 48–60.
Picard N, Saint-André L. Henry M. 1997. Manual for building tree volume and biomass allometric equations: from field measurements to prediction. Rome: Food and Agricultural Organization of the United Nations.
Preece ND, Crowley GM, Lawes MJ, van Oosterzee P. 2012. Comparing above ground biomass among forest types in wet tropics: Small stems and plantation types matter in carbon accounting. Forest Ecology and Management 264: 228 – 237.
Rebeiro CS, Fehrmann L, Boechat S CP, Gonçalves J LA, Kleinn C, de Oliveira G R. 2011. Above- and belowground biomass in a Brazilian Cerrado. Forest Ecology and Management 262: 491–499.
Tadese S, Soromessa T, Bekele T, Bereta A, Temesgen F. 2019. Above Ground Biomass Estimation Methods and Challenges: A Review. Journal of Energy Technologies and Policy 9 (8):12-25.