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The influence of selective logging on residual stand and regeneration in a tropical rain forest in southwestern Ethiopia

Tarekegn, Abebe (2002). The influence of selective logging on residual stand and regeneration in a tropical rain forest in southwestern Ethiopia. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Silvestria, 1401-6230 ; 261
ISBN 91-576-6345-9
[Doctoral thesis]

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Abstract

The polycyclic selective logging system is the most widely applied system in tropical forests. Harvesting of logs from forests managed under pulycyclic systems is a significant silvicultural intervention. Selective logging is practiced in many natural forests of southwestern Ethiopia, but to date no studies have been undertaken. Therefore, the objectives of the work described in this thesis were (a) to study the effects of commercial selective logging on the residual stand; (b) to estimate the wood residue generated by selectively logging and sawmilling operations; (c) to assess the regeneration status in selective logged-over stands; (d) to study the growth and survival of commercial species using the enrichment planting method; and (e) to test the growth and photosynthesis responses of seedlings of commercial tree species to different light intensity. The studies were carried out in transitional rain forest in southwestern Ethiopia. On average for every tree felled, 8 trees above 5 cm in dbh were damaged during felling. The log recovery rate and lumber recovery factor were 38.3 and 36 %, respectively for selective logging and sawmilling operations. Saplings regeneration after two years was I745 ha⁻¹ and the number of poles after eight years was 263 ha⁻¹. The only commercial species considered having adequate natural regeneration was Cordia africana Lam. In the enrichment planting, the survival rate and mean height growth after 12 months varied from 50 to 100 % and 4.0 to 104.4 cm, respectively, depending on the species and treatment. A shading experiment showed that, except for the leaf number, there were no significant differences among treatments in collar diameter and height increment for seedlings of Aningeria adolfi-friederici (Engl.) Robyns & Gilbert but for C. africana seedlings there were significant differences in all cases. The average net photosynthesis for A. adolfi-friederici seedlings was highest for the seedlings grown at the lowest light treatment and for C. africana seedlings it was highest at the highest light treatment. The rain forests in southwestern Ethiopia probably can be managed effectively using selective logging methods. They have a potential to regenerate after such operations. However, currently they are exploited without any working plan. Therefore, the fate of these forests in the future depends on the efforts devoted now in putting them under sustainable management.

Authors/Creators:Tarekegn, Abebe
Title:The influence of selective logging on residual stand and regeneration in a tropical rain forest in southwestern Ethiopia
Year of publishing :April 2002
Volume:261
Number of Pages:68
Papers/manuscripts:
NumberReferences
ALLI. Tarekegn Abebe and Holm, S. 2000. The effect of commercial selective logging on a residual stand in tropical rain forest of southwestern Ethiopia. (Accepted for publication in the Jounal of Tropical Forest Science). II. Tarekegn Abebe and Holm, S. 2001. Estimation of wood residues from small-scale commercial selective logging and sawmilling in tropical rain forest of southwestern Ethiopia. (Submitted Manuscript). III. Tarekegn Abebe. 2002. Forest regeneration following selective logging in a rain forest in southwestern Ethiopia. (Manuscript). IV. Tarekegn Abebe, Bäckström, P-O., and Holm, S. 2002. Enrichment planting of commercial species in selective logged-over rain forest in southwestern Ethiopia: Effects of planting line direction and width on survival and growth of seedlings. (Submitted Manuscript). V. Tarekegn Abebe, Bäckström, P-O., and Holm, S. 2002. Growth and photosynthesis of seedlings of two commercial tree species grown under different irradiance levels. (Manuscript).
Place of Publication:Umeå
ISBN for printed version:91-576-6345-9
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
Subjects:Not in use, please see Agris categories
Agrovoc terms:tropical rain forests, selective felling, forest stands, felling, mechanical damage, wood residues, sawmills, regeneration, planting, seedlings, shade, cordia, antiaris, ethiopia
Keywords:Logging damage, Recovery rate, Natural regeneration, Enrichment planting, Light intensity, Photosynthesis
ID Code:213
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: Staff Epsilon
Deposited On:04 Apr 2003 00:00
Metadata Last Modified:02 Dec 2014 10:02

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