Blue Carbon pp 85-88 | Cite as

Summary and Conclusions

  • Daniel M. Alongi
Part of the SpringerBriefs in Climate Studies book series (BRIEFSCLIMATE)


Salt marshes, mangroves and seagrass meadows both actively and passively capture sediment and associated carbon particles from the overlying water. Median carbon sequestration rates in salt marshes, mangroves and seagrasses are 184, 103 and 167 g Corg m−2 d−1, respectively, while median global carbon sequestration rates are 10.0, 14.2 and 50.2–100.0 Tg Corg year−1. Median carbon stocks for salt marshes, mangroves and seagrasses are 282.2, 723.4 and 69.3 Mg Corg ha−1, respectively, while the median global carbon stocks are 1.2, 10.0 and 2.2–4.4 Pg Corg. Estimated carbon emissions (Pg CO2 equivalents) are 0.04–0.08 for salt marshes, 0.27–0.59 for mangroves and 0.54–1.08 for seagrasses. The economic costs (billion USD year−1) of wetland losses equate to $0.52–$1.04 for salt marshes, $3.51–$7.67 for mangroves and $7.02–$14.04 for seagrasses. Salt marshes, mangrove forests and seagrass meadows sequester and store more carbon than all other marine ecosystems and clearly are prime sites to retain carbon as any losses back to the atmosphere or coastal ocean are disproportionate to their small area.


  1. Duarte CM (2017) Reviews and syntheses: Hidden forests, the role of vegetated coastal habitats in the ocean carbon budget. Biogeosciences 14:301–310CrossRefGoogle Scholar
  2. Hansen MC, Potapov PV, Moore R, Hancher M, Turubanova TA, Thau D, Stehman SV, Goetz SJ, Loveland TR, Kommareddy A, Egorov A, Chini L, Justice CO, Townshend JRG (2013) High-resolution global maps of 21st-century forest cover change. Science 342:850–853CrossRefGoogle Scholar
  3. Pan Y, Birdsey RA, Fang J, Houghton R, Kauppi PE, Kurz WA, Phillips OL, Shvidenko A, Lewis SL, Canadell JG, Ciais P, Jackson RB, Pacala SW, McGuire AD, Piao S, Rautiainen A, Sitch S, Hayes D (2011) A large and persistent carbon sink in the world’s forests. Science 333:988–993CrossRefGoogle Scholar
  4. Pendleton L, Donato DC, Murray BC, Crooks S, Jenkins WA, Sifleet S, Craft C, Fourqurean JW, Kauffman JB, Marbá N, Megonigal P, Pidgeon E, Herr D, Gordon D, Baldera A (2012) Estimating global “blue carbon” emissions from conversion and degradation of vegetated coastal ecosystems. PLoS One 7:e43542CrossRefGoogle Scholar

Copyright information

© The Author(s) 2018

Authors and Affiliations

  • Daniel M. Alongi
    • 1
  1. 1.Tropical Coastal & Mangrove ConsultantsAnnandaleAustralia

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