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Tree species diversity, topsoil conditions and arbuscular mycorrhizal association in the Sidama traditional agroforestry land use, southern Ethiopia

Zebene, Asfaw (2003). Tree species diversity, topsoil conditions and arbuscular mycorrhizal association in the Sidama traditional agroforestry land use, southern Ethiopia. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Silvestria, 1401-6230 ; 263
ISBN 91-576-6347-5
[Doctoral thesis]

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Abstract

Sidama farmers cultivate trees to meet their food, wood, fodder and other service needs. Tree cultivation intensity has increased during the past three decades. Significant positive correlation was found between farm size and number of species, and number of stems per farm. The number of tree species per farm averaged 16 and ranged from 4 to 28. Within farms, about ten different field types were identified of which enset fields contain the highest number of species. Wealthy households have more tree species than poor households. In general the largest number of tree species, the largest number of stems and the largest basal area ha⁻¹ were recorded on farms of wealthy households. Based on farmers´knowledge and laboratory studies, nutrient accumulation in the topsoil under Cordia africana, Millettia ferruginea and Eucalyptus camaldulensis managed under three agroforestry practices (AF) on different farms at three sites was evaluated. Significantly higher concentration of P was observed under Millettia and Cordia than under Eucalyptus. pH under Millettia and Cordia were significantly higher than under Eucalyptus at one site. Topsoil under Millettia and Cordia also had significantly higher levels of exchangeable Ca and Mg than Eucalyptus. For scattered AF soil and enset, plants were sampled at laterally increasing distances from the tree trunks and outside the canopy on enset and maize fields. Under canopies of both Cordia and Millettia trees, the diameter of enset was significantly greater than that of enset plants grown in open fields. Topsoil under canopies of scattered Cordia and Millettia trees, compared with open fields, generally had higher pH, CEC, increased total N, organic C and available P, but had no effect on some exchangeable bases. Six tree-crop combinations and two open-maize plots in enset and maize fields were selected to study the level of indigenous arbuscular mycorrhizal (AM), number of spores and levels of root colonization. At field level, tree-crop combinations induced a higher number of spores and level of colonization than in an open-maize field. The proportions of roots were in the following order: tree-enset-coffee > tree-enset > tree-maize for Cordia trees and tree-enset > tree-enset-coffee > tree-maize for Millettia trees. Beneath both Cordia and Millettia trees scattered on maize fields, the proportion of colonized root decreased with increasing distances laterally from the tree trunks. At nursery level, significantly higher levels of root colonization were observed for maize plants grown on soil from beneath tree enset-coffee and enset plots than those grown on soil from tree-maize and open-maize plots. The percentage of AM colonized roots of maize was significantly positively correlated with the number of spore counts for field soils.

Authors/Creators:Zebene, Asfaw
Title:Tree species diversity, topsoil conditions and arbuscular mycorrhizal association in the Sidama traditional agroforestry land use, southern Ethiopia
Year of publishing :April 2003
Volume:263
Number of Pages:34
Papers/manuscripts:
NumberReferences
ALLI. Zebene Asfaw and Hulten, H. 2002. Tree diversity management in the traditional agroforestry land use of Sidama, southern Ethiopia. Swedish University of Agricultural Sciences, Department of Forest Management and Products. (Submitted to Agroforestry Systems) II. Zebene Asfaw and Ågren, G. I. 2002. The impact of tree-enset-coffee and eucalyptus woodlot agroforestry practices on soil: assessment of farmers´ perceptions and topsoil properties in Sidama, southern Ethiopia. (Submitted to Agroforestry Systems) III. Zebene Asfaw and Ågren, G. I. 2002. Topsoil conditions and enset growth beneath scattered Cordia africana and Millettia ferruginea trees in agroforestry land use systems of Sidama, southern Ethiopia. (Submitted to Agroforestry Systems) IV. Zebene Asfaw and Hulten, H. 2002. Arbuscular mycorrhizal colonisation of Cordia africana and Millettia ferruginea trees in the traditional agroforestry land use systems of Sidama, southern Ethiopia. (Submitted to Plant and Soil).
Place of Publication:Uppsala
ISBN for printed version:91-576-6347-5
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F08 Cropping patterns and systems
Subjects:Not in use, please see Agris categories
Agrovoc terms:cordia, eucalyptus camaldulensis, millettia, planting, socioeconomic environment, top soil, nutrients, mycorrhizae, colonizing ability, roots, spores, ensete, maize, agroforestry, ethiopia
Keywords:Cordia africana, diameter, enset, Eucalyptus camaldulensis, farmer´ knowledge, fieldmaize, Millettia ferruginea, root colonization, spores, wealth categories
URN:NBN:urn:nbn:se:slu:epsilon-165
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-165
ID Code:214
Department:(S) > Institutionen för skogens produkter och marknader (t.o.m. 061231)
Deposited By: Staff Epsilon
Deposited On:04 Apr 2003 00:00
Metadata Last Modified:02 Dec 2014 10:02

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