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Water potential gradients for gaps and slopes in a Panamanian tropical moist forest's dry season

Published online by Cambridge University Press:  10 July 2009

Peter Becker ,
Peter E. Rabenold ,
Jacquelyn R. Idol  and
Alan P. Smith
Peter Becker
Affiliation:
Smithsonian Tropical Research Institute, Aptdo 2072, Balboa, Republica de Panamá
Peter E. Rabenold
Affiliation:
Smithsonian Tropical Research Institute, Aptdo 2072, Balboa, Republica de Panamá
Jacquelyn R. Idol
Affiliation:
Smithsonian Tropical Research Institute, Aptdo 2072, Balboa, Republica de Panamá
Alan P. Smith
Affiliation:
Smithsonian Tropical Research Institute, Aptdo 2072, Balboa, Republica de Panamá
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Abstract

Soil water potentials were measured weekly by psychrometers at 20 cm depth during the dry season in a tropical moist forest on Barro Colorado Island, Panama. There was a persistent gradient of decreasing soil moisture from gap centre to gap edge to adjacent understorey at both a large and a small gap. On both a north-south and an east-west transect, the soil was drier (water potentials were more negative) on an upland surface than on moderate slopes. This trend was reflected in the predawn, total water potentials of shallow-rooted Psychotria horizontalis and deep-rooted Trichilia tuberculata measured in the understorey during the last two months of the dry season. P. horizontalis from the wettest sites on the transects had higher osmotic potentials at full hydration and at zero turgor, indicating less drought resistance than for conspecifics from the driest sites.

Keywords

Barro Colorado Islanddry seasongapgradientosmotic potentialPanamaplant water potentialslopesoil water potentialtropical moist forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 4 , Issue 2 , May 1988 , pp. 173 - 184
Copyright
Copyright © Cambridge University Press 1988

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