Data Accessibility Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request and will be deposited in Dryad repository.
References
1. Belsley, D. A., Kuh, E. & Welsch, R. E. (1980). Regression Diagnostics: Identifying      Influential Data and Sources of Collinearity. New York: John Wiley.
2. Brand, G.J., Smith, W.B. (1985). Evaluating allometric shrub biomass equations fit to      generated data. Canadian Journal of Botany 63: 64–67.
3. Chave, J., Andalo, C., Brown, S., Cairns, M. A., Chambers, J. Q., Eamus, D. &          Yamakura, T. (2005). Tree allometry and improved estimation of carbon stocks and      balance in tropical forests. Oecologia 145: 87-99.
4. Field, A.P. (2009). Discovering statistics using SPSS: and sex and drugs and rock ‘n’ roll      (3rd edition). London: Sage.
5. Gower, S.T., Kucharik, C.J., Norman, J.M., (1999). Direct and indirect estimation of leaf      area index, F(APAR), and net primary production of terrestrial ecosystems. Remote Sens.      Environ. 70: 29–51.
6. Hedberg, I., Edwards, S., Nemomissa, S., editors (2003). Flora of Ethiopia and Eritrea.         Apiaceae to Dipsaceae, vol. 4(1). Addis Ababa: The National Herbarium, Addis Ababa     University.
7. Kangas A. and Maltamo M. (2006). Forest inventory: Methodology and Applications,     Managing Forest Ecosystems, Vol. 10. Springer, Dordrecht, the Netherlands.
8. Ketterings, Q.M., Coe, R., Van Noordwijk, M., Ambagau, Y., Palm, C.A. (2001).     Reducing uncertainty in the use of allometric biomass equations for predicting above-    ground tree biomass in mixed secondary forests. For. Ecol. Manage 146: 199–209.
9. Maraseni, T.N., Cockfield, G., Apan, A. and 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 ISSN 1832-    0236.
10. Nelson, B.W., Mesquita, R., Pereira, J.L.G., de Souza, S.G.A., Batista, G.T., Couta, L.B.,       (1999). Allometric regressions for improved estimate of secondary forest biomass in the       Central Amazon. Forest Ecology and Management 117: 149–167.
11. Niklas, K.J., (1994). Plant Allometry: The Scaling of Form and Process. University of            Chicago Press, Chicago, Illinois.
12. Osborne and Waters (2002). Four assumptions of multiple regression that researcher       should always test. Practical Assessment, Research & Evaluation, 8(2).
13. Pastor, J., Aber, J.D., Melillo, J.M., (1984). Biomass prediction using generalized             allometric regressions for some northeast tree species. For. Ecol. Manage 7: 265–274.
14. Picard N., Saint-Andre L., Henry M. (2012). Manual for building tree volume and       biomass     allometric equations: from field measurement to prediction. Food and       Agricultural     Organization of the United Nations, Rome, and Centre de cooperation       Internationale en     Recherche Agronomique pour le Development, Montpellier, 213 pp.
15. Quinn, G.P. & Keough, M.J. (2002). Experimental Design and Data Analysis for       Biologists. Cambridge University Press, Cambridge.
16. Sokal, R.R., Rohlf, F.J., (1995). Biometry: The Principles and Practice of Statistic in       Biological Research, 3rd ed. W.H. Freeman and Co., New York, 859 pp.
17. Sprugel, D.G., 1983. Correcting for bias in log-transformed allometric equations. Ecology       64 (1): 209–210.
18. Stevens, J.P. (2009). Applied multivariate statistics for the social sciences, 5th ed. New       York: Routledge.
19. Tabachnick, B. & Fidell, L. (2006). Cleaning up your act screening data prior to analysis.       Using multivariate analysis, 5th ed. Needham Heights, MA: Allyn & Bacon.
20. Tessema, A.B.(1993). Useful Trees and Shrubs for Ethiopia: Identification, Propagation       and Management for Agricultural and Pastoral Communities. Regional Soil Conservation      Unit (RSCU) Swedish International Development Authority (SIDA) Embassy of Sweden,      Nairobi, Kenya.
21. Vann, D. R., Palmiotto, P. A., Strimbeck, G. R. (1998). Allometric equations for two            South American conifers: Test of a non-destructive method. Forest Ecology and       Management 106: 55–71.