-Soil CO 2 efflux rates were measured from July to September 1994 in three vegetation types (primary forest, hardwood plantation and clear-cut) near Sinnamary, French Guiana (5° 15' N, 52°55' W), using a portable closed-chamber infrared gas analysis system. Mean soil CO 2 efflux rates were: 2.3 μmol m -2 s -1 in the primary forest versus 2.5 μmol m -2 s -1 in the clear-cut and 2.9 μmol m -2 s -1 in the plantation. Diurnal patterns of soil CO 2 efflux in the primary forest and hardwood plantation did not show significant (P ≤ 0.05) changes. No correlation between soil CO 2 efflux rate and soil temperature was detected in these two vegetation types. In the clearcut, a very pronounced peak in soil CO 2 efflux rate occurred, which was strongly correlated with soil temperature. In all three sites, the range of average soil CO 2 efflux rates among collars (spatial differences) largely exceeded the range observed among daily means (temporal variation
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