2026-10-13T08:01:49Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34021332 2026-09-29T05:16:34Z category_30881 category_30563 category_33614 category_33617 category_33725 portal_1005 item_type_6 month_year_09_2026

Soil organic carbon stocks and sequestration rates in Western Australia’s mangroves E Gomis (25135359) C Salinas (13374267) M Williams-Hoffman (25135362) NE Said (25135365) M Sánchez Alarcón (25135368) C Gorham (16320567) A Werner (9436335) PS Lavery (14130270) K Inostroza (25135371) T Davies (13363803) PF Grierson (7751081) S Hickey (13644277) B Radford (9896534) E Ballesteros (15966038) JJ Kelleway (14861341) P Masqué (13393017) E Serrano (21858413) PI Macreadie (9886841) CE Lovelock (14130267) A Lafratta (13535071) M Duarte de Paula Costa (13365774) R Reef (13411149) V Levchenko (25135374) F Doessel (25135377) MA Hayes (15799322) SM Trevathan-Tackett (14456271) IN Yilmaz (14450061) Pawel Waryszak (13088757) R Crofts (25135380) O Serrano (13397280) Biological sciences Agricultural, veterinary and food sciences Environmental sciences Climate change impacts and adaptation Soil sciences Science & Technology Life Sciences & Biomedicine Soil Science Agriculture Blue carbon Climate change Coastal vegetated ecosystems Carbon inventories Biogeochemistry Carbon crediting frameworks BLUE CARBON COASTAL ECOSYSTEMS LEEUWIN CURRENT FORESTS SEDIMENTS MODELS PB-210 COVER GULF 15 Life on Land Mangroves are widely recognized for their contribution to climate change mitigation. This study provides the first comprehensive assessment of top 1-m and 30-cm soil organic carbon (OC) stocks and accumulation rates across Western Australia’s mangroves, spanning multiple bioregions, geomorphological settings, and intertidal positions. The results revealed (mean ± SE) 236 ± 13 Mg and 83 ± 4 Mg OC ha⁻¹ in top 1-m and 30-cm soils, respectively, accumulated at 443 ± 83 and 215 ± 22 kg OC ha⁻¹ yr⁻¹ over the past 100 and 500 years, respectively. Mangroves across Western Australia exhibited up to 3-fold differences in top 1-m stocks, with highest OC stocks in tropical settings (328 ± 54 Mg OC ha⁻¹) and lowest in temperate mangroves (138 ± 15 Mg OC ha⁻¹). At a landscape scale, mangroves within protected embayments and lower and mid intertidal positions held up to ∼1.5-fold higher OC stocks than those in estuarine settings and upper intertidal positions. Long-term accumulation rates varied up to 6-fold, with highest rates in semiarid bioregions and protected settings. Across 212,000 to 277,000 ha of mangrove extent in Western Australia, total stocks in 1-m soils were estimated at 71–86 Tg OC, accumulated at 94–123 Gg OC per annum. Western Australia’s ongoing mangrove losses have been estimated at 0.27% yr⁻¹, which could result in 177–232 Gg CO2-eq yr⁻¹ emissions. This study estimates the contribution of Western Australia’s mangroves to the global carbon cycle and provides the basis for improving current national carbon inventories and crediting frameworks. 2026-09-01T00:00:00Z Text Journal contribution 10.26187/deakin.34021332 https://figshare.com/articles/journal_contribution/Soil_organic_carbon_stocks_and_sequestration_rates_in_Western_Australia_s_mangroves/34021332 CC BY-NC 4.0