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Charcoal preservation and fire history in floodplain wetlands: problems and prospects

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thesis
posted on 28.03.2022, 13:42 by Bradley Graves
Fire plays an important role in floodplain wetlands, and wetland ecosystems respond dynamically in space and time to flooding, fire and geomorphological processes. Fire-climate-hydrology-vegetation interactions are complex and a multifaceted approach is required to understand and interpret fire history. This study investigated the use of macro-charcoal to interpret palaeo-fire regimes in the Macquarie Marshes. Sentinel Hotspot satellite data showed that Buckiinguy Swamp experienced 33 ignition points from 2002-2016, whereas Willancorah Swamp experienced 6 ignition points in this period. Macro-charcoal in contemporary sediment from Buckiinguy was used to estimate fluvial charcoal supply from upstream (13.5±3.2no. cm-3). Despite taking account of fluvial inputs, macro-charcoal in sediment profiles from both wetlands was highly variable. Buckiinguy had macro-charcoal up to 90 no. cm-3 in the upper 40 cm (mean charcoal accumulation rate; CHAR 0.55 cm-2a-1), and Willancorah had up to 450 no. cm-3 in the upper 60 cm (CHAR 3.75 cm-2a-1). Sedimentology, geochemistry, and carbon stable isotopes (δ13C range -15 to -25 ‰) were similar in both wetlands and quite uniform with depth. When combined with charcoal records, these proxies cannot be used with confidence to reconstruct local fire regimes.Water and wetland management could benefit from future palaeo-fire research if sufficient spatial and temporal assessment of fire and wetland conditions can be achieved.

History

Table of Contents

Chapter 1 Thesis introduction -- Chapter 2 Review of fire history and environmental research in wetlands -- Chapter 3 Using charcoal and environmental proxies to understand fire history and wetland conditions in the Macquarie Marshes -- Chapter 4 Conclusion.

Notes

Theoretical thesis. Bibliography: page 52-61

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Degree

MRes, Macquarie University, Faculty of Science and Engineering, Department of Environmental Sciences

Department, Centre or School

Department of Environmental Sciences

Year of Award

2017

Principal Supervisor

Tim Ralph

Rights

Copyright Bradley Graves 2017. Copyright disclaimer: http://mq.edu.au/library/copyright.

Language

English

Extent

1 online resource (vi, 70 pages) illustrations

Former Identifiers

mq:71529 http://hdl.handle.net/1959.14/1275311