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Notes on natural regeneration in Dominica, Windward Islands
These notes have been condensed from an unpublished report prepared for the Government of Dominica. In Dominica where there is high rainfall, reforestation by artificial regeneration, although technically feasible, is very costly owing to the luxuriant growth of climbers. Small areas were logged dur...
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Published in: | Commonwealth forestry review 1976-01, Vol.55 (1), p.27-36 |
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Main Author: | |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | These notes have been condensed from an unpublished report prepared for the Government of Dominica. In Dominica where there is high rainfall, reforestation by artificial regeneration, although technically feasible, is very costly owing to the luxuriant growth of climbers. Small areas were logged during a limited extraction operation between 1968 and 1972. Inspection of the natural regeneration, both here and on various abandoned farms, indicates that there is adequate regeneration of commercially desirable species, a rather unusual situation in the conditions of tropical rainforest. Sterculia caribaea, the Lauraceae and Byrsonima martinicensis are the main components. Investigation of growth rates suggests increments in excess of 1 cm diameter per year. With good felling and extraction techniques, and a minimum diameter for felling of about 25 cm, a felling cycle of 50 years should be sufficient to ensure the growth of a utilisable crop. Crown-diameter/stem-diameter ratio measurements for the main species indicated that they conformed with those frequently found for tropical hardwoods. Maximum basal area densities in the region of 17-25 m²/ha were computed. The situation in Dominica is particularly favourable as the species which demonstrated the fastest growth rates appear to support the highest basal area densities. Natural regeneration of the rain forest, after exploitation, can form the basis for reforestation, supplemented by enrichment planting when necessary. Ces notes sont le condensé d'un rapport, non publié, qui a été rédigé à l'intention du gouvernement de la Dominique. A la Dominique, où la pluviosité est élevée, le reboisement par régénération artificielle, bien que techniquement possible, est très coûteux, en raison de la luxuriance des lianes. Des coupes ont été effectuées sur de petites surfaces, lors d'une opération d'exploitation, entre 1968 et 1972. Le repérage de la régénération naturelle, sur ces emplacements, ainsi que sur les terres de fermes abandonnées, montre que la régénération des espèces commerciales recherchées est satisfaisante, ce qui arrive assez rarement, en forêt dense tropicale. Le Sterculia caribaea, les Lauracées et le Byrsonima martinicensis en sont les principales composantes. Les recherches sur le taux d'accroissement permettent d'envisager un peu plus d'un centimètre par an. Si les techniques d'abattage et de débardage sont valables et que l'on adopte comme diamètre d'abattage un minimum de 25 cm, une révolution à |
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ISSN: | 0010-3381 2055-5245 |