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Carbon sequestration by Australian tidal marshes.
Peter I Macreadie1,2, Q R Ollivier1, J J Kelleway2,3
1Deakin University, School of Life and Environmental Sciences, Centre for Integrative Ecology, 221 Burwood Highway, Burwood, VIC 3125, Australia.
Scientific Reports
|March 11, 2017
Summary
Australia
Area of Science:
- Environmental Science
- Marine Biology
- Climate Science
Background:
- Australia's tidal marshes have experienced significant degradation.
- Tidal marshes are increasingly recognized for their crucial role in carbon sequestration.
- This highlights the urgent need for conservation and restoration efforts.
Purpose of the Study:
- To quantify soil organic carbon (OC) storage and accumulation rates in Australian tidal marshes.
- To assess the blue carbon potential and climate change mitigation value of these ecosystems.
- To identify key factors influencing carbon storage in tidal marsh environments.
Main Methods:
- Compilation and analysis of data from 323 soil cores across Australian tidal marshes.
- Calculation of average OC stocks and accumulation rates within the top 1-meter soil depth.
- Statistical analysis to determine the influence of geomorphology on OC storage.
Main Results:
- Average OC stocks in the top 1m of Australian tidal marshes are 165.41 Mg OC ha⁻¹.
- Mean OC accumulation rate is 0.55 Mg OC ha⁻¹ yr⁻¹.
- Fluvial geomorphology is a significant predictor, showing higher OC stocks than seaward sites.
Conclusions:
- Australian tidal marshes store an estimated 212 million tonnes of OC, valued at $USD7.19 billion.
- These ecosystems sequester 0.75 Tg OC annually, valued at $USD28.02 million per annum.
- Restoration of tidal marshes is vital for climate change mitigation, adaptation, and ecosystem services.
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