A lonely dot on the map: Exploring the climate signal in tree-ring density and stable isotopes of clanwilliam cedar, South Africa

De Mil, Tom; Meko, M.; Belmecheri, S.; February, E.; Therrell, M.; Van den Builke, J.; Trouet, V.

doi:10.1016/j.dendro.2021.125879

Article (Scientific journals)

A lonely dot on the map: Exploring the climate signal in tree-ring density and stable isotopes of clanwilliam cedar, South Africa

De Mil, Tom; Meko, M.; Belmecheri, S. et al.

2021 • In Dendrochronologia, 69, p. 9

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https://hdl.handle.net/2268/265200

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10.1016/j.dendro.2021.125879

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Keywords :

Maximum latewood density (MXD); Maximum latewood blue intensity (MXBI); Minimum density (MND); South Africa; Stable isotopes; Widdringtonia cedarbergensis; X-ray Computed micro tomography (X-ray CT)

Abstract :

[en] Clanwilliam cedar (Widdringtonia cedarbergensis; WICE), a long-lived conifer with distinct tree rings in Cape Province, South Africa, has potential to provide a unique high-resolution climate proxy for southern Africa. However, the climate signal in WICE tree-ring width (TRW) is weak and the dendroclimatic potential of other WICE tree-ring parameters therefore needs to be explored. Here, we investigate the climatic signal in various tree-ring parameters, including TRW, Minimum Density (MND), Maximum Latewood Density (MXD), Maximum Latewood Blue Intensity (MXBI), and stable carbon and oxygen isotopes (δ18O and δ13C) measured in WICE samples collected in 1978. MND was negatively influenced by early spring (October-November) precipitation whereas TRW was positively influenced by spring November-December precipitation. MXD was negatively influenced by autumn (April-May) temperature whereas MXBI was not influenced by temperature. Both MXD and MXBI were negatively influenced by January-March and January-May precipitation respectively. We did not find a significant climate signal in either of the stable isotope time series, which were measured on a limited number of samples. WICE can live to be at least 356 years old and the current TRW chronology extends back to 1564 CE. The development of full-length chronologies of alternative tree-ring parameters, particularly MND, would allow for an annually resolved, multi-century spring precipitation reconstruction for this region in southern Africa, where vulnerability to future climate change is high.

Disciplines :

Environmental sciences & ecology
Agriculture & agronomy
Phytobiology (plant sciences, forestry, mycology...)

Author, co-author :

De Mil, Tom ; Université de Liège - ULiège > Département GxABT > Gestion des ressources forestières et des milieux naturels

Meko, M.

Belmecheri, S.

February, E.

Therrell, M.

Van den Builke, J.

Trouet, V.

Language :

English

Title :

A lonely dot on the map: Exploring the climate signal in tree-ring density and stable isotopes of clanwilliam cedar, South Africa

Publication date :

2021

Journal title :

Dendrochronologia

ISSN :

1125-7865

eISSN :

1612-0051

Publisher :

Archeonatura, Italy

Volume :

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 22 November 2021

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