Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/104274
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Type: Journal article
Title: Carbon isotope discrimination in leaves of the broad-leaved paperbark tree, Melaleuca quinquenervia, as a tool for quantifying past tropical and subtropical rainfall
Author: Tibby, J.
Barr, C.
McInerney, F.
Henderson, A.
Leng, M.
Greenway, M.
Marshall, J.
McGregor, G.
Tyler, J.
McNeil, V.
Citation: Global Change Biology, 2016; 22(10):3474-3486
Publisher: Wiley
Issue Date: 2016
ISSN: 1354-1013
1365-2486
Statement of
Responsibility: 
John Tibby, Cameron Barr, Francesca A. McInerney Andrew C.G. Henderson, Melanie J . Leng, Margaret Greenway, Jonathan C. Marshall, Glenn B. McGregor, Jonathan J. Tyler and Vivienne McNeil
Abstract: Quantitative reconstructions of terrestrial climate are highly sought after but rare, particularly in Australia. Carbon isotope discrimination in plant leaves (Δleaf ) is an established indicator of past hydroclimate because the fractionation of carbon isotopes during photosynthesis is strongly influenced by water stress. Leaves of the evergreen tree Melaleuca quinquenervia have been recovered from the sediments of some perched lakes on North Stradbroke and Fraser Islands, south-east Queensland, eastern Australia. Here, we examine the potential for using M. quinquenervia ∆leaf as a tracer of past rainfall by analysing carbon isotope ratios (δ¹³ C) of modern leaves. We firstly assess Δleaf variation at the leaf and stand scale and find no systematic pattern within leaves or between leaves due to their position on the tree. We then examine the relationships between climate and Δleaf for a 11-year time series of leaves collected in a litter tray. M. quinquenervia retains its leaves for 1-4 years; thus, cumulative average climate data are used. There is a significant relationship between annual mean ∆leaf and mean annual rainfall of the hydrological year for 1-4 years (i.e. 365-1460 days) prior to leaf fall (r²  = 0.64, P = 0.003, n = 11). This relationship is marginally improved by accounting for the effect of pCO₂ on discrimination (r²  = 0.67, P = 0.002, n = 11). The correlation between rainfall and Δleaf , and the natural distribution of Melaleuca quinquenervia around wetlands of eastern Australia, Papua New Guinea and New Caledonia offers significant potential to infer past rainfall on a wide range of spatial and temporal scales.
Keywords: Carbon isotope ratios; climate reconstruction, CO₂; discrimination; Holocene; palaeoclimate; wetlands
RMID: 0030046759
DOI: 10.1111/gcb.13277
Grant ID: http://purl.org/au-research/grants/arc/LP34106364
http://purl.org/au-research/grants/arc/DP150103875
http://purl.org/au-research/grants/arc/FT110100793
http://purl.org/au-research/grants/arc/DP130104314
Appears in Collections:Geography, Environment and Population publications

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