Igniting river health? Testing the effectiveness of low intensity burns to improve riparian vegetation quality in modified ecosystems

Elisha Duxbury; Kirstie Fryirs; Michelle R. Leishman

doi:10.1071/WF24140

RESEARCH ARTICLE (Open Access)

Previous Next Contents Vol 34(5)

Igniting river health? Testing the effectiveness of low intensity burns to improve riparian vegetation quality in modified ecosystems

Elisha Duxbury ^A ^* , Kirstie Fryirs

^A , Michelle R. Leishman ^A and Thungghutti Natural Regeneration Team ^B

+ Author Affiliations

- Author Affiliations

^A School of Natural Sciences, Macquarie University, Sydney, Australia.

^B Thungghutti Local Aboriginal Land Council, Bellbrook, Australia.

^* Correspondence to: elisha.duxbury@hdr.mq.edu.au

International Journal of Wildland Fire 34, WF24140 https://doi.org/10.1071/WF24140

Submitted: 23 August 2024 Accepted: 26 March 2025 Published: 1 May 2025

© 2025 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of IAWF. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Background

Fire is largely untested for controlling invasive exotic plant species in highly modified riparian systems.

Aims

This study tested a low intensity burn in combination with herbicide application for reducing cover of three riparian woody weeds and increasing the presence of native plant species.

Methods

We surveyed native and exotic riparian vegetation and three target woody weeds over 1 year at a river reach that underwent herbicide treatment and a low intensity burn. Fire temperatures were recorded at the soil surface and 10-cm depth.

Key results

Maximum temperatures in burned areas exceeded 399°C at the soil surface and reached 47.1°C at 10-cm depth. Exotic midstorey species richness and woody riparian weed cover were considerably less 3-months after burning and herbicide treatment compared with herbicide treatment alone, then subsequently increased.

Conclusions

A combination of herbicide treatment with follow-up low intensity burning may be effective in reducing woody weed cover in the short term. However, fire temperatures recorded during the burn may not be hot enough to trigger fire-promoted native species germination.

Implications

Using low intensity burns in riparian systems to promote native plant regeneration has promise, however, integrated weed management utilising fire in highly modified riparian systems will require follow-up interventions within a relatively short timeframe.

Keywords: cultural burning, geomorphic recovery, low intensity burn, novel ecosystem, soil temperature, riparian ecology, river management, vegetation management.

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