Preprints
https://doi.org/10.5194/bg-2020-426
https://doi.org/10.5194/bg-2020-426

  24 Nov 2020

24 Nov 2020

Review status: a revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

Hypersaline tidal flats as important Blue Carbon systems: A case study from three ecosystems

Dylan R. Brown1, Humberto Marrota2,3,4, Roberta B. Peixoto2,3, Alex Enrich-Prast2,5,6, Glenda C. Barroso3, Mario L. G. Soares7, Wilson Machado3, Alexander Pérez3,8, Joseph M. Smoak9, Luciana M. Sanders10, Stephen Conrad1, James Z. Sippo1,10,11, Isaac R. Santos1,12, Damien T. Maher1,10,11, and Christian J. Sanders1,13 Dylan R. Brown et al.
  • 1National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, PO Box 4321, Coffs Harbour, NSW 2450, Australia
  • 2Ecosystems and Global Change Laboratory (LEMG-UFF)/International Laboratory of Global Change (LINCGlobal), Biomass and Water Management Research Center (NAB), Universidade Federal Fluminense, Av. Edmundo March, s/n°, Niterói, RJ, 24210-310, Brazil
  • 3Graduate Program in Geosciences (Environmental Geochemistry), Department of Geochemistry, Universidade Federal Fluminense, Niterói, RJ, 24020-141, Brazil
  • 4Physical Geography Laboratory (LAGEF-UFF), Department of Geography, Graduate Program in Geography, Universidade Federal Fluminense (UFF), Av. Gal. Milton Tavares de Souza, s/n°, Niterói, RJ, 24210-346, Brazil
  • 5Department of Thematic Studies–Environmental Change, Linköping University, 581 83, Linköping, Sweden
  • 6Department of Botany, Universidade Federal do Rio de Janeiro, 21941-902, Rio de Janeiro, Brazil
  • 7Laboratory For Mangrove Studies (NEMA-UERJ)/International Laboratory of Global Change (LINCGlobal), Department of Biological Oceanography, Faculty of Oceanography, Universidade do Estado do Rio de Janeiro (UERJ), Rua São Francisco Xavier. 524, sala 4019-E, Rio de Janeiro, RJ, 20550-900, Brazil
  • 8Universidad Peruana Cayetano Heredia, Centro de investigación para el desarrollo integral y sostenible (CIDIS), Facultad de Ciencias y Filosofía, Laboratorios de investigación y desarrollo (LID), Laboratorio de Biogeociencias, Av. Honorio Delgado 430, Urb. Ingeniería, Lima 31 – Perú
  • 9Environmental Science, University of South Florida, St. Petersburg, Florida 33701, USA
  • 10Southern Cross Geoscience, Southern Cross University, PO Box 157, Lismore NSW 2480, Australia
  • 11School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW, 2480, Australia
  • 12Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden
  • 13State Key Laboratory of Estuarine and Coastal Research and Institute of Eco-Chongming, East China Normal University, Shanghai 201100, P. R. China

Abstract. Hypersaline tidal flats (HTFs) are coastal ecosystems with freshwater deficits often occurring in arid or semi-arid regions near mangrove supratidal zones with no major fluvial contributions. Here, we estimate that organic carbon (OC), total nitrogen (TN) and total phosphorus (TP) are being buried at rates averaging 21 (± 6), 1.7 (± 0.3), and 1.4 (± 0.3) g m−2 y−1, respectively, during the previous century in three contrasting HTFs systems, one in Brazil (eutrophic) and two in Australia (oligotrophic). Although these rates are lower than those from nearby mangrove, saltmarsh and seagrass systems, the importance of HTFs as sinks for OC, TN and TP may be significant given their extensive coverage. Despite the measured short-term variability between net air-saltpan CO2 influx and emission estimates found during the dry and wet season in the Brazilian HTF, the only site with seasonal CO2 fluxes measurements, the OC sedimentary profiles over several decades suggests efficient OC burial at all sites. Indeed, the stable isotopes of OC and TN (δ13C and δ15N) along with C : N ratios show that microphytobenthos are the major source of the buried OC in these HTFs. Our findings highlight a previously unquantified carbon as well as nutrient sink and suggest that coastal HTF ecosystems could be included in the emerging blue carbon framework.

Dylan R. Brown et al.

 
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Dylan R. Brown et al.

Dylan R. Brown et al.

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