Macquarie University
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Temporal carbon assessment through radiometric and repeat measure analysis in a mangrove

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posted on 2022-03-28, 23:22 authored by Karen Marie Lamont
Mangrove ecosystems store large quantities of organic carbon for long periods of time. This study explores long-term 'blue carbon' stock change through the first comparative study of radiometric analysis and repeat measures over a multi-decadal period in a mangrove system. Examining a tall and stunted forest, radiometric analysis estimated a soil organic carbon accumulation rate of 4.3 ± 1 Mg C ha-1 y-1 in the tall gallery forest and 1.7 ± 0 Mg C ha-1 y-1 in a stunted mangrove encroachment zone. Repeat measures of only root carbon estimated 5.06 Mg C ha-1 y-1 in the tall forest and 6.63 Mg C ha-1 y-1 in the stunted forest - suggesting an underestimate by radiometric dating of 15% and 74% in the tall and stunted forest respectively. Past bulk carbon measures were not available, however it is likely this discrepancy would be higher if informed by repeat measures of bulk carbon. A higher carbon stock in the stunted forest was attributed to root mass increase, associated with landward mangrove encroachment. Extrapolated to the entire region of NSW, we estimate that mangrove encroachment has contributed at least ~1,853,000 Mg C sequestration over the 70 years for which this has been observed in NSW.


Table of Contents

1 Introduction -- 2 Literature review -- 3 Study site -- 4 Methods -- 5 Results -- 6 Discussion -- 7 Conclusion -- 8 Acknowledgements -- 9 References.


Theoretical thesis. Bibliography: pages 48-54

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


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

Department, Centre or School

Department of Environmental Sciences

Year of Award


Principal Supervisor

Neil Saintilan


Copyright Karen Marie Lamont 2018 Copyright disclaimer:




1 online resource (vii, 54 pages) illustrations

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