Collection Notice Explicative n° 113
5 cartes, notice, 35 p., 22,90 euros
sols de 5 îles hautes de l'Archipel de la Société
sont étudiés ici : Moorea, Huahiné, Raiatea, Tahaa
et Bora Bora. L'évolution de ces îles est liée
à l'érosion et à la subsidence, mais aussi à
leurs particularités géomorphologiques : Raiatea, la plus
récente, contraste par son aspect massif avec Bora Bora parvenue
au stade de presqu'atoll.
A soil study is made of the five high islands which form the Society Archipelago: Moorea, Huahine, Raiatea, Tahaa and Bora Bora. The evolution of these islands is linked to erosion and subsidence, but also to their geomorphological characteristics. Due to its massive structure, the more recent one, Raiatea, contrats with the oldest one, Bora Bora which is nearly an atoll. All of them show highly dissected reliefs and arable lands cover small areas which are variable however according the islands. Bora Bora and Huahine islands display broader reef rings on which small coral islands ("motu") have been formed. The latter can make up partly for the shortage in agricultural lands observed in the volcanic centre. A thoroughly original agriculture has been observed for forty years : melons, water melons and sweet peppers are cultivated in a network of holes in the coral, which can be irrigated by the close fresh groundwater, and filled with volcanic land brought from the close high island.
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