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Universität für Bodenkultur Wien (2013)

Edible biomass production potential and management status of Ficus thonningii blume in North West Ethiopia

Andargie, Amsalu Abich

Titre : Edible biomass production potential and management status of Ficus thonningii blume in North West Ethiopia

Auteur : Andargie, Amsalu Abich

Université de soutenance : Universität für Bodenkultur Wien

Grade : Master of Science (MS) 2013

Résumé
Fodder trees and shrubs are important sources of fodder for livestock production in Ethiopia. Ficus thonningii is a fodder tree species with high nutritive values and multiple benefits. However, its fodder biomass production was largely unknown until recently, when first allometric functions were developed for estimating fodder. These functions, however, were developed for unmanaged trees only. The general objective of this study was thus to determine the leaf biomass production of Ficus thonningii trees across tree age and management intensity gradients in the Gondar region of Ethiopia. Management of the trees was characterised by group discussions with 100 farmers owning 462 Ficus thonningii trees. Tree and crown size variables were measured and leaf biomass was determined using random branch sampling at 50 sample trees. Farmers identified and ranked the following eight important fodder trees and shrub species in decreasing order of importance : Ficus thonningii, Cordia africana, Acacia species, Capparis tomentosa, Rosa abyssinica, Carissa edulis, Ficus vasta and Dodonaea viscosa. Regression analysis to estimate leaf biomass from tree – and crown size parameters resulted in a significant function with the diameter at stump height as independent variable, however, the functions explained only 14% of the variation in leaf biomass. It can be concluded, that for trees which are lopped, the presented allometric relations are significantly altered through lopping and functions for estimating leaf biomass for lopped trees are difficult to develop. The existing functions rather describe the leaf production potentials of this species.

Mots clés : Ficus thonningii, Futterbäume, Schneitelung, Äthiopien, allometrische Functionen, random branch sampling — Ficus thonningii, fodder trees, lopping, Ethiopia, allometric functions, random branch sampling

Présentation

Page publiée le 30 décembre 2015, mise à jour le 11 décembre 2017