19 Jan 2022
19 Jan 2022
Status: this preprint is currently under review for the journal BG.

Sedimentary blue carbon dynamics based on chrono-sequential observation in a tropical restored mangrove forest

Raghab Ray1, Rempei Suwa2, Toshihiro Miyajima1, Jeffrey Munar3, Masaya Yoshikai4, Maria Lourdes San Diego-McGlone3, and Kazuo Nadaoka4 Raghab Ray et al.
  • 1Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa
  • 2Japan International Research Center for Agricultural Sciences, Tsukuba
  • 3Marine Science Institute, University of the Philippines, Diliman
  • 4School of Environment and Society, Tokyo Institute of Technology, Tokyo

Abstract. Among many ecosystem services, macro-climate regulation via the storage of large amounts of organic carbon (OC) in marine sediments (also known as ‘blue carbon’) has given mangroves enormous global attention due to their role in climate change mitigation. While there are many studies on blue carbon potential of intact mangroves (i.e. naturally growing), there have been very few on restored mangroves (i.e. planted). This study aims to address this knowledge gap by examining sediment development process during early colonization (rehabilitation) of mangroves in an OC-poor estuary in the Panay Island, Philippines. Based on endmember source apportionment in sedimentary organic matter, the contribution of mangrove plant material was higher at the older sites compared to the younger settings or bare sediment where there is more contribution of riverine input. A clear increasing gradient according to mangrove development was observed for bulk OC (0.06 to 3.4 µmol g−1), porewater OC (292 to 2150 µmol L−1), sedimentary OC stock (3.13 to 77.4 Mg C ha−1) and OC loading per surface area (7 to 223 µmol m−2). The estimate of carbon accumulation rates (6 to 33 mol m−2 yr−1) based on chrono-sequence are within the global ranges and show an increasing pattern with mangrove age. Although a differential yet systematic pattern of increasing OC sink based on short-term chrono-sequence can define the role of a mangrove rehabilitation program, there is a need for long-term monitoring to verify the consistently elevated OC with mangrove growth.

Raghab Ray et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2021-359', Anonymous Referee #1, 10 May 2022
    • AC1: 'Reply on RC1', Raghab Ray, 02 Aug 2022
  • RC2: 'Comment on bg-2021-359', mark chatting, 13 Jul 2022
    • AC2: 'Reply on RC2', Raghab Ray, 02 Aug 2022
    • AC3: 'Reply on RC2', Raghab Ray, 02 Aug 2022

Raghab Ray et al.

Raghab Ray et al.


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Short summary
Mangroves are blue carbon ecosystems known to store large amounts of organic carbon in the sediments. This study is a first attempt to apply a chrono sequence (or space-for-time substitution) approach to evaluate the distribution and accumulation rate of carbon in a 30 year (max age) restored mangrove forest. Using this approach, the contribution of restored or planted mangroves to sedimentary organic carbon presents an increasing pattern with mangrove age.