Since 1997, the authors have examined the main components of the water budget within a primary Amazonian rain forest in southern Venezuela at the Surumoni Crane Project site. Annual interception loss determined from the forest amounts to 17% of gross annual precipitation. Transpiration was measured for eight different tree species, using the constant-heating method. Monthly values of transpiration loss were remarkably lower compared to reports from other study sites in tropical South America. Although further analysis is needed to prove the reliability of the calculated total amounts, these data already provide valuable information about the physiological response of the trees to various environmental parameters.
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