Allometric equations for biomass estimation of Enset (Ensete ventricosum) grown in indigenous agroforestry systems in the Rift Valley escarpment of southern-eastern Ethiopia
Tóm tắt
Enset (Ensete ventricosum), commonly known as false banana, is a large thick, single-stemmed, perennial herbaceous banana-like plant growing in the wild of sub-Sahara Africa, Madagascar and parts of Asia. In Ethiopia it has been domesticated and serves as a food plant. While the productivity and management of enset for food (pseudostem and corm) has been studied, little attention has been given to total biomass production and associated carbon sequestration. The objective of this study was to develop and evaluate allometric models for estimating above and belowground biomass and organic matter contents of enset grown in indigenous agroforestry systems in Rift Valley escarpment of south-eastern Ethiopia. Biomass harvesting of 40 plants was carried out at altitudes from 1900 to 2400 m.a.s.l. The mean plant dry weight was 9.4 ± 0.84 kg and organic matter content 94 %. Pseudostem biomass accounted for highest (64 %) of total biomass, followed by corm (24 %) and foliage (12 %). Basal diameter (d
10) was the best predictor variable for total and all biomass components (Spearman r = 0.775–0.980, p < 0.01). The power model using d
10 and height (H) (Y = 0.0007d
10
2.571
H
0.101; R
2 = 0.91) was found to be the best performing model (highest ranking over six good-of-fit statistics) for predicting total biomass. Model performance decreased in the order pseudostem > corm > foliage biomass. The models presented can be used to accurately predict biomass and organic matter of enset in the agroforestry systems of Rift Valley escarpments Ethiopia.
Tài liệu tham khảo
Amedea T, Delveb R (2006) Improved decision-making for achieving triple benefits of food security, income and environmental services through modeling cropping systems in the Ethiopian highlands. African Highlands Initiative (AHI) Working Papers # 20, p 12
Asfaw N, Licence P, Engida T, Poliakoff M (2007) Empowering green chemists in Ethiopia. Science 316:1849–1850. doi:10.1126/science.1144439
Birmeta G, Nybom H, Bekele E (2004) Distinction between wild and cultivated enset (Ensete ventricosum) gene pools in Ethiopia using RAPD markers. J Hered 140:139–148
Bizuayehu T, Ludders P (2003) Diversity and distribution patterns of enset landraces in Sidama, southern Ethiopia. Genet Resour Crop Evol 50:359–371
Blench R (2003) Enset culture and its history in highland Ethiopia. In: Mous M, Azeb A, Köppe K (eds) Proceedings of the cushitic and omotic conference, Leiden, p 1–3
Blomme G, Sebuwufu G, Addis T, Turyagyenda LF (2008) Relative performance of root and shoot development in enset and east African highland bananas. J Afri Crop Sci 16(1):51–57
Brandt SA, Spring A, Hiebsch C, McCabe JT, Tabogie E, Diro M, Wolde-Michael G, Yntiso G, Shigeta M, Tesfaye S (1997) The tree against hunger. Enset based agricultural systems in Ethiopia. AAAS, Washington, DC
Crawley MJ (2005) Statistics: an introduction using R. Wiley, West Sussex p 327
FAO (1988) Soil map of the world. Revised legend, world soil resources report no. 60. FAO–UNESCO–ISRIC, Rome
Fekadu D, Ledin I (1997) Weight and chemical composition of the plant parts of enset (Ensete ventricosum) and the intake and degradability of enset by cattle. Liv Prod Sci 49:249–257 (PII S0301-6226(97)00047-X)
Hairiah K, Dewi S, Agus F, Velarde S, Ekadinata A, Rahayu S, van Noordwijk M (2011) Measuring carbon stocks across land use systems: a manual. World Agroforestry Centre (ICRAF), SEA Regional Office, Bogor, p 154
Harmel RD, Smith PK (2007) Consideration of measurement uncertainty in the evaluation of goodness-of-fit in hydrologic and water quality modeling. J Hydrol 33:326–336
Kanshie TK (2002) Five thousand years of sustainability? A case study on gedeo land use (Southern Ethiopia). Ph.D. dissertation. Wageningen Agricultural University, Wageningen 295 pp
Kaonga ML, Bayliss-Smith TP (2010) Allometric models for estimation of aboveground carbon stocks in improved fallows in eastern Zambia. Agrofor Syst 78:217–232. doi:10.1007/s10457-009-9253-7
Kozak A, Kozak R (2003) Does cross validation provide additional information in the evaluation of regression models? Can J For Res 33:976–987
Mebrate BT (2007) Agroforestry practices in Gedeo Zone, Ethiopia: a geographical analysis. PhD dissertation. Panjab University, Chandigarh 188
Negash A, Niehof A (2004) The significance of enset culture and biodiversity for rural household food and livelihood security in southwestern Ethiopia. Agric Hum Values 21:61–71
Nurfeta A, Tolera A, Eik LO, Sundstøl F (2008) The supplementary value of different parts of enset (Ensete ventricosum) to sheep fed wheat straw and Desmodium intortum hay. Liv Sci 119:22–30. doi:10.1016/j.livsci.2008.02.010
Nurfeta A, Tolera A, Eik LO, Sundstø F (2009) Effect of enset (Ensete ventricosum) leaf supplementation on feed intake, digestibility, nitrogen utilization and body weight gain of sheep fed untreated or urea and calcium oxide-treated wheat straw. Liv Sci 122:134–142. doi:10.1016/j.livsci.2008.08.005
R Development Core Team (2010) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna. ISBN 3-900051-07-0
Segura M, Kanninen M, Suárez D (2006) Allometric models for estimating aboveground biomass of shade trees and coffee bushes grown together. Agroforest Syst 68:143–150. doi:10.1007/s10457-006-9005-x
Shank R, Ertiro C (1996) A linear model for predicting enset plant yield and assessment of Kocho production in Ethiopia. World Food Program, Ministry of Agriculture, Southern Nation Nationalities, People Regional State, UNDP Emergencies Unit for Ethiopia, Addis Ababa, p 62
Simmonds NW (1966) The evolution of the bananas, 2nd edn. Longmans, London, p 512
Soto-Pinto L, Anzueto M, Mendoza J, Ferrer GJ, de Jong B (2010) Carbon sequestration through agroforestry in indigenous communities of Chiapas, Mexico. Agrofor Syst 78:39–51. doi:10.1007/s10457-009-9247-5
Tesfaye B (2008a) On Sidama folk identification, naming, and classification of cultivated enset (Ensete ventricosum) varieties. Genet Resour Crop Evol 55:1359–1370. doi:10.1007/s10722-008-9334-x
Tesfaye B (2008b) The enset (Ensete ventricosum) gardens of Sidama: composition, structure and dynamics of a traditional poly-variety system. Genet Resour Crop Evol 55:1347–1358. doi:10.1007/s10722-008-9333-y
Tsegaye A, Struik PC (2000) Influence of repetitive transplanting and leaf pruning on dry matter and food production of enset (Ensete ventricosum Welw. (Cheesman). Field Crops Res 68:61–74
Tsegaye A, Struik PC (2001) Enset (Ensete ventricosum (Welw.) Cheesman) kocho yield under different crop establishment methods as compared to yields of other carbohydrate-rich food crops. Neth J Agric Sci 49:81–94
Tsegaye A, Struik PC (2003) Growth, radiation use efficiency and yield potential of enset (Ensete ventricosum) at different sites in southern Ethiopia. Ann Appl Biol 142:71–81
Yamaguchi J, Araki S (2004) Biomass production of banana plants in the indigenous farming system of the East African highland: a case study on the Kamachumu Plateau in northwest Tanzania. Agric Ecosyst Environ 102:93–111
Zewdie S, Olsson M, Fetene M (2008) Effect of drought/irrigation on proximate composition and carbohydrate content of two enset [Ensete ventricosum (welw.) cheesman] clones. SINET Ethiop J Sci 31(2):81–88 (ISSN: 0379–2897)