Abstract
Peltogyne gracilipes Ducke (Caesalpiniaceae) occurs as a monodominant tree on and around Maraca Island, Roraima, Brazil, on a range of soils, This paper describes the broad boundary between Peltogyne-rich forest (PRF) and a forest (PPF) with few individuals of this species. The work is part of an attempt to explain the causes of the PRF, and to test if the boundary is moving. Three parallel transects (180 m x 20m) were located across the boundary of one of the PRF stands. Peltogyne trees (? 30 cm dbh), saplings and seedlings were more abundant in PRF than in PPF. The soil data showed that the soils are fairly acid, sandy, and nutrient-poor. There were no large edaphic differences at the boundary, although Mg was higher in PRF. There is some evidence that the PRF is extending into the PPF.
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