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Nutritional traits of riverine eucalypts across lowland catchments in southeastern Australia

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journal contribution
posted on 10.02.2022, 00:48 by Denise FernandoDenise Fernando, F Dyer, S Gehrig, S Capon, AE Fernando, A George, Cherie CampbellCherie Campbell, A Tschierschke, G Palmer, M Davies, AS Kinsela, RN Collins, M Nolan, T Doody
Eucalyptus (Myrtaceae) trees are ubiquitous in riparian-floodplain zones of Australia's south-eastern river catchments, where natural ecosystems continue to be affected. In the Murray-Darling Basin (MDB), provision of environmental flows to mitigate tree decline is informed by past field studies. However, broadscale empirical field data on tree nutrition and response to external changes remain scarce. This is the first study to gather soil and plant data across a large area of catchment lowlands to generate a low-resolution regional snapshot of tree nutrition and soil chemistry. Leaves and soils were sampled across and adjacent to the MDB; from and beneath mature trees of three key riverine eucalypts, Eucalyptus largiflorens, E. camaldulensis, and E. coolabah. Foliar sodium concentrations ranged from ∼500 mg kg-1 for E. coolabah up to ∼4500 mg kg-1 for E. largiflorens, with highest values at the River Murray sites. The results suggest E. largiflorens is highly salt tolerant by foliage accumulation given all trees sampled were in good condition. Further research into these species is needed to determine toxicity thresholds for elements such as sodium to aid early diagnosis of potential tree stress, which could provide an additional line of evidence for when environmental water is required to mitigate decline.

Funding

D. R. Fernando acknowledges funding from the Australian Research Council (ARC grant number DE120100510) and Eucalypt Australia; and in-kind contribution from the University of New South Wales.

History

Publication Date

01/12/2021

Journal

Australian Journal of Botany

Volume

69

Issue

8

Pagination

20p. (p. 565-584)

Publisher

CSIRO Publishing

ISSN

0067-1924

Rights Statement

© 2021 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons AttributionNonCommercial 4.0 International License (CC BY-NC).