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Validation of allometric models for Sele-Nono forest in Ethiopia

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Abstract

In relation to the current climate change scenario, an increasing demand for research about forest biomass and/or carbon stock assessment through general allometric equation has been evident especially in tropical areas, which include the Ethiopian forests too. In Ethiopia, the majority of the natural forests that reflect large reservoirs of carbon are found in the moist southwest forests of the country as in for instance Sele-Nono forest, and estimating this biomass/carbon stock would influence the country to revise its forest policy. However, most of the allometric equations were developed based on data collected far from the southwest forests of the country; and hence may be a source of error in biomass and carbon stock estimation. Thus, this study was conducted aiming to validate the possible allometric equation for Sele-Nono forest so as to minimize the uncertainty that might be introduced due to the choice of the allometric models. For this purpose, a total of 30 plant individuals (10 trees, 5 palms, 5 fern trees, 5 lianas, and 5 bamboos) were used in this study for relevant data collection following the recommendation of Walker et al. (Standard operating procedures for terrestrial carbon measurement. Version 2012. Winrock International, USA). Regression graphs, paired t test, and cross-validation statistics were used for data analysis. The results showed that Chave et al. (Glob Change Biol 20:3177–3190, 2014) model was the more accurate model for estimating the biomass of trees in the Sele-Nono forest as compared to the local equations developed by the woody biomass project in Ethiopia and the general allometric equations developed for moist trees of tropical forest. Lianas were found to be better estimated using Schnitzer et al. (Biotropica 38:581–591, 2006), whereas Palms, highland bamboos (Arundinaria alpina), and fern trees (Cyathea manniana) were better estimated using Tiepolo et al. (Extension Serie Taiwan Forestry Research Institute 153:98–115, 2002), Mulatu and Fetene (Ethiop J Biol Sci 12:1–23, 2013), and Stanley et al. (The climate action project research initiative. Paper Presented at the Second Annual Conference on Carbon Sequestration, Arlington, 2003) models, respectively (Bias ≤ 10%). Based on the findings of our study we recommend that the biomass equations proposed by Chave et al. (Glob Change Biol 20:3177–3190, 2014), Tiepolo et al. (Extension Serie Taiwan Forestry Research Institute 153:98–115, 2002), Schnitzer et al. (Biotropica 38:581–591, 2006), Mulatu and Fetene (Ethiop J Biol Sci 12:1–23, 2013), and Stanley et al. (The climate action project research initiative. Paper Presented at the Second Annual Conference on Carbon Sequestration, Arlington, 2003) shall be employed for biomass and carbon stock estimation of trees, palms, lianas, bamboos, and fern trees, respectively, in Sele-Nono forest.

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Acknowledgements

We thank the research crew of the local people for the tree climbing data (Biomass data of trees and palm) from the Sele-Nono forest. This work has been funded by the Second Thematic Research Fund (DEB 0235650 and DEB 9810221) of Addis Ababa University (AAU), and Debre Markos University (DMU). We highly acknowledge them

Funding

This research has been funded by Addis Ababa University and Debre Markos University (Both in Ethiopia).

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Authors and Affiliations

  1. Department of Plant Biology and Biodiversity Management, The National Herbarium, Addis Ababa University, P.O. Box: 3434, Addis Ababa, Ethiopia

    Alemayehu Kefalew & Sebsebe Demissew

  2. Center for Environmental Science, Addis Ababa University, P. O. Box No: 1176, Addis Ababa, Ethiopia

    Teshome Soromessa

  3. Department of Biology, Debre Markos University (DMU), P. O. Box, 269, Debre Markos, Ethiopia

    Alemayehu Kefalew

  4. Department of Statistics, College of Natural Science, Addis Ababa University, P. O. Box No: 1176, Addis Ababa, Ethiopia

    Merga Belina

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Research design, data collection, data analysis, writing drats manuscripts AK. Review and editing, Supervision MB, TS and SD. All authors read and approved the final manuscript.

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Kefalew, A., Soromessa, T., Demissew, S. et al. Validation of allometric models for Sele-Nono forest in Ethiopia. Model. Earth Syst. Environ. 9, 2239–2258 (2023). https://doi.org/10.1007/s40808-022-01611-3

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