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Thirty-two tree species were tested for adaptability in Puerto Rico's humid, granitic uplands, a region of sandy, well drained, erosive soils. Based on adaptability and potential wood uses the following species are recommended for timber plantations: Honduras pine for most landowners; mahoe for those willing to speculate on development of a demand for this cabinet wood; kadam for those with special interest in this lightweight, general utility wood, and those with severe weed problems; and eucalyptus or casuarina for owners interested only in post and pole crops. RESUMEN Treinta y dos especies de arboles fueron probadas para su adaptabilidad a las alturas graniticas y humedas de Puerto Rico, una region de suelos erosivos, bien drenados, y arenosos.Basado en la adaptabilidad y usos potenciales de la madera, las siguientes especies son recomendadas para plantaciones maderables: pino hondureno para la mayoria de los duenos de terrenos; mahoe para aquellos que esten dispuestos a especular en el desarrollo de una demanda por esta madera para gabinetes; kadam para aquellos con interes especial en esta madera liviana y de utilidad general, y para aquellos con problemas graves de yerbajos; y eucalipto o casuarina para los duenos de terreno que solamente esten interesados en la produccion de postes para veijas y para construccion.

Araucaria hunsteinii K. Schuman (Syn. A. klinki Lauterbach), locally known as Klinki, is a tropical conifer from Papua New Guinea, which was introduced to Costa Rica in 1966 by the Tropical Agriculture Research and Training Center (CATIE). Due to its capacity for carbon sequestration and long-term storage, and wood production, EARTH University, located in the Atlantic lowlands of Costa Rica, established two research plots with the species in October 1993 to monitor its growth in the humid tropical lowland conditions. Results show that the species performs well under such soil and climate conditions.It seems probable that Klinki may be considered as a promising species for commercial timber production and for long-term carbon sequestration in the tropics.