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Stable carbon and oxygen isotopes in tree rings show physiological responses of Pericopsis elata to precipitation in the Congo Basin

Published online by Cambridge University Press:  12 April 2016

Daniele Colombaroli
Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Paolo Cherubini
WSL Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland
Maaike De Ridder
Wood Biology Service, Royal Museum for Central Africa, Tervuren, Belgium Laboratory for Wood Technology, Ghent University, Ghent, Belgium
Matthias Saurer
Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Switzerland
Benjamin Toirambe
Wood Biology Service, Royal Museum for Central Africa, Tervuren, Belgium
Noëmi Zweifel
Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
Hans Beeckman
Wood Biology Service, Royal Museum for Central Africa, Tervuren, Belgium


In equatorial regions, where tree rings are less distinct or even absent, the response of forests to high-frequency climate variability is poorly understood. We measured stable carbon and oxygen isotopes in anatomically distinct, annual growth rings of four Pericopsis elata trees from a plantation in the Congo Basin, to assess their sensitivity to recorded changes in precipitation over the last 50 y. Our results suggest that oxygen isotopes have high common signal strength (EPS = 0.74), and respond to multi-annual precipitation variability at the regional scale, with low δ18O values (28–29‰) during wetter conditions (1960–1970). Conversely, δ13C are mostly related to growth variation, which in a light-demanding species are driven by competition for light. Differences in δ13C values between fast- and slow-growing trees (c. 2‰), result in low common signal strength (EPS = 0.37) and are driven by micro-site conditions rather than by climate. This study highlights the potential for understanding the causes of growth variation in P. elata as well as past hydroclimatic changes, in a climatically complex region characterized by a bimodal distribution in precipitation.

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Copyright © Cambridge University Press 2016 

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Stable carbon and oxygen isotopes in tree rings show physiological responses of Pericopsis elata to precipitation in the Congo Basin
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