科研之友
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摘要
Private teak plantations in southern Benin have been established at an increasing rate in the last thirty years. To remedy the lack of reliable information on this resource, a methodological approach was designed to quantify and characterise private teak plantations and gain a better understanding of the private owners involved in teak production in Benin. The method involves %26quot;snowball sampling%26quot; among three categories of players: forestry service agents, village chiefs and the owners of teak plantations or their representatives. The data collected are the socio-economic profiles of the owners, an overall description of their plantations and dendrometric characterisations of these plantations. In order to assess its performance, the snowball sampling technique was tested by the quadrant method. Snowball sampling identified 1,002 owners and 861.10 ha of Tectona grandis L.f. plantations. Almost 69 % of the plantations were less than 6 years of age, of which 12.4 % were young plantations and 56.7 % coppice. Stands more than 20 years of age accounted for only a very small proportion of these teak resources (0.2 %). With a very low overall afforestation rate, estimated at 3.58 %, and a snowball sampling detection rate of 68.6%, the total area planted with teak was estimated at 1,255.3 ha, within confidence limits of 1,084.5 ha and 1,574.2 ha. The geodatabase built up during the snowball sampling campaign in the Toffo municipality is clearly a promising start for the development of a network of players involved in teak production. The value of snowball sampling in the context of small-scale sylviculture warrants its application to the other municipalities concerned.
- 出版日期2013
