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

Colombaroli, Daniele; Cherubini, Paolo; De Ridder, Maaike; Saurer, Matthias; Toirambe, Benjamin; Zweifel, Noëmi; Beeckman, Hans (2016). Stable carbon and oxygen isotopes in tree rings show physiological responses of Pericopsis elata to precipitation in the Congo Basin. Journal of Tropical Ecology, 32(3), pp. 213-225. Cambridge University Press 10.1017/S0266467416000134

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Colombaroli, Daniele and Zweifel, Noëmi

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0266-4674

Publisher:

Cambridge University Press

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

18 May 2016 11:29

Last Modified:

01 Nov 2016 02:30

Publisher DOI:

10.1017/S0266467416000134

Uncontrolled Keywords:

Africa, Congo, stable isotopes, tree rings, tropical rain forest

BORIS DOI:

10.7892/boris.82029

URI:

https://boris.unibe.ch/id/eprint/82029

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