Author Identifier

Connor Gorham

Orcid: https://orcid.org/0000-0003-2883-7702

Paul Lavery

Orcid: https://orcid.org/0000-0001-5162-273X

Cristian Salinas

Orcid: https://orcid.org/0000-0002-4716-5991

Oscar Serrano

Orcid: https://orcid.org/0000-0002-5973-0046

Document Type

Journal Article

Publication Title

Ecosystems

Publisher

Springer

School

School of Science / Centre for Marine Ecosystems Research

RAS ID

32051

Funders

Edith Cowan University - Open Access Support Scheme

Comments

Gorham, C., Lavery, P., Kelleway, J. J., Salinas, C., & Serrano, O. (2020). Soil Carbon Stocks Vary Across Geomorphic Settings in Australian Temperate Tidal Marsh Ecosystems. Ecosystems, 1-16. https://doi.org/10.1007/s10021-020-00520-9

Abstract

Tidal marshes rank among the ecosystems with the highest capacity to sequester and store organic carbon (Corg) on earth. To inform conservation of coastal vegetated ecosystems for climate change mitigation, this study investigated the factors driving variability in carbon storage. We estimated soil Corg stocks in tidal marshes across temperate Western Australia and assessed differences among geomorphic settings (marine and fluvial deltas, and mid-estuary) and vegetation type (Sarcocornia quinqueflora and Juncus kraussii) linked to soil biogeochemistry. Soil Corg stocks within fluvial and mid-estuary settings were significantly higher (209 ± 14 and 211 ± 20 Mg Corg ha−1, respectively; 1-m-thick soils) than in marine counterparts (156 ± 12 Mg Corg ha−1), which can be partially explained by higher preservation of soil Corg in fluvial and mid-estuary settings rich in fine-grained ( < 0.063 mm) sediments (49 ± 3% and 47 ± 4%, respectively) compared to marine settings (23 ± 4%). Soil Corg stocks were not significantly different between S. quinqueflora and J. kraussii marshes (185 ± 13 and 202 ± 13 Mg Corg ha−1, respectively). The higher contribution of tidal marsh plus supratidal vegetation in fluvial (80%) and intermediate (76%) compared to marine (57%) settings further explains differences in soil Corg stocks. The estimated soil Corg stocks in temperate Western Australia’s tidal marshes (57 Tg Corg within ~ 3000 km2 extent) correspond to about 2% of worldwide tidal marsh soil Corg stocks. The results obtained identify global drivers of soil Corg storage in tidal marshes and can be used to target hot spots for climate change mitigation based on tidal marsh conservation.

DOI

10.1007/s10021-020-00520-9

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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