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Photodegradation, interaction with iron oxides and bioavailability of dissolved organic matter from forested floodplain sources

Howitt, Julia A., Baldwin, Darren S., Rees, Gavin N. and Hart, Barry T. 2008, Photodegradation, interaction with iron oxides and bioavailability of dissolved organic matter from forested floodplain sources, Marine and freshwater research, vol. 59, no. 9, pp. 780-791, doi: 10.1071/MF07225.

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Title Photodegradation, interaction with iron oxides and bioavailability of dissolved organic matter from forested floodplain sources
Author(s) Howitt, Julia A.
Baldwin, Darren S.
Rees, Gavin N.
Hart, Barry T.
Journal name Marine and freshwater research
Volume number 59
Issue number 9
Start page 780
End page 791
Publisher CSIRO Publishing
Place of publication Collingwood, Vic.
Publication date 2008
ISSN 1323-1650
1448-6059
Keyword(s) aquatic carbon cycle
excitation-emission matrix (EEM)
humic substances
Murray River
Summary Photochemical degradation of dissolved organic matter (DOM) can influence food webs by altering the availability of carbon to microbial communities, and may be particularly important following periods of high DOM input (e.g. flooding of forested floodplains). Iron oxides can facilitate these reactions, but their influence on subsequent organic products is poorly understood. Degradation experiments with billabong (= oxbow lake) water and river red gum (Eucalyptus camaldulensis) leaf leachate were conducted to assess the importance of these reactions in floodplain systems. Photochemical degradation of DOM in sunlight-irradiated quartz tubes (with and without amorphous iron oxide) was studied using gas chromatography and UV-visible spectroscopy. Photochemical reactions generated gaseous products and small organic acids. Bioavailability of billabong DOM increased following irradiation, whereas that of leaf leachate was not significantly altered. Fluorescence excitation-emission spectra suggested that the humic component of billabong organic matter was particularly susceptible to degradation, and the source of DOM influenced the changes observed. The addition of amorphous iron oxide increased rates of photochemical degradation of leachate and billabong DOM. The importance of photochemical reactions to aquatic systems will depend on the source of the DOM and its starting bioavailability, whereas inputs of freshly formed iron oxides will accelerate the processes.
Language eng
DOI 10.1071/MF07225
Field of Research 039901 Environmental Chemistry (incl Atmospheric Chemistry)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2008, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017264

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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