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Assessment of Regeneration Techniques Effects on the Physical Characteristics of Teak Trees
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As financial resources for forest planting are getting scarcer in Ivory Coast (Côte d'Ivoire), this paper compares four regeneration techniques of teak in order to determine the one that reduces reforestation cost and produces well-conformed trees So, in a forestry experimentation, 15301 teak trees were matched for diameter, total height, basal area, productivity index, and other characteristics such as section form, presence of low branches, trunk straightness and health state. Four regeneration techniques (Ti) have been tested: T1-artificial regeneration of teak in association with acacia; T2-artificial regeneration from stump plants; T3-teak regeneration from resprouts after clear cutting; and T4-natural regeneration from wild stock. The results show that the health state is, in general, good; the rate of healthy trees ranges from 93.67% with T3 to 97.13% with T2. According to other relevant characteristics, the four regeneration techniques were classed from the most suitable to the least one (T2> T1> T3> T4).Artificial regeneration (T2) appears to be the best technique while natural regeneration (T4) seems the worst one. Indeed, trees resulting from T2 present the best physical characteristics concerning total height, productivity index, basal area, trunk section form and straightness. A specific management recommendation was made. To produce large trees, it is better not to associate teak with another plantation species; the origin of the trees, artificial (T2) or natural (T3 and T4), does not matter. But, to produce trees that are well conformed, only artificial techniques of regeneration are recommended.
Keywords
Teakre Generation Technique, Tree Physical Characteristic, Loglinear Model, Mosaicplot
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