Crude hydrocarbons were added to the surface of wet tundra soils at Barrow, Alaska at volumes of 5 and 12 l/m2. Physical and chemical effects in the soil were followed for three years. Soils treated with 5 I/mZ had their chemical and physical properties. little altered. Those treated with 12 I/m2 recorded an increase in seasonal thaw, an increase in organlc carbon and an increase in available phosphorus. soil pH shifted toward neutrality. Decreases occurred in water infiltration rate and in plant available cations (Ca, Mg, K). Soil moisture, bulk density, shrinkage percent and total sulphur content appeared unaffected. RGSUMI?. A Barrow en Alaska, du petrole brut a ete repandu en surface sur des Sols de toundra humide, aux taux de 5 et 12 litres au mz. Pendant trois ans, on a suivi les consequences physiques et chimiques dans le sol. Au taux de 5 litres/m*, les soh traites ont eu leurs proprietes chimiques et physiques peu alterees. Les sols traites sur la base de 12 litres/m2 ont enregistre un accroissement du degel saisonnier et un accroissement du carbone organique et du phosphore disponible. Le pH du sol est devenu neutre. Le rendement d'infiltration d'eau decroissait comme celui des cations de Plantes disponibles (Ca, Mg, K). L'humidite du sol, sa densite de fmasse, son pourcentage de contraction, et le contenu total en soufre apparaissait sans changement. Traduit par Alain de Vendigies, Aquitaine Co. of Canada Ltd.
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