Organic carbon burial and sources in soils of coastal mudflat and mangrove ecosystems

Mangrove organic carbon is primarily stored in soils, which contain more than two-thirds of total mangrove ecosystem carbon stocks. Despite increasing recognition of the critical role of mangrove ecosystems for climate change mitigation, there is limited understanding of soil organic carbon sequestration mechanisms in undisturbed low-latitude mangroves, specifically on organic carbon burial rates and sources. This study assessed soil organic carbon burial rates, sources and stocks across an undisturbed coastal mudflat and mangrove hydrogeomorphological catena (fringe mangrove and interior mangrove) in Bintuni Bay, West Papua Province, Indonesia. 210Pb radionuclide sediment dating, and mixing model of natural stable isotope signatures (δ 13C and δ15N) and C/N ratio were used to estimate organic carbon burial rates and to quantify proportions of allochthonous (i.e., upland terrestrial forest) and autochthonous (i.e., on-site mangrove forest) organic carbon in the top 50 cm of the soil. Burial rates were in the range of 0.21–1.19 Mg C ha−1 yr−1. Compared to the fringe mangroves, organic carbon burial rates in interior mangroves were almost twice as high. Primary productivity of C3 upland forest vegetation and mangroves induced soil organic carbon burial in interior mangroves and this was consistent with the formation of the largest organic carbon stocks (179 ± 82 Mg C ha−1). By contrast, organic carbon stored in the fringe mangrove (68 ± 11 Mg C ha−1) and mudflat (62 ± 10 Mg C ha−1) soils mainly originated from upland forests (allochthonous origin). These findings clearly indicate that carbon sequestered and cycling in mangrove and terrestrial forest ecosystems are closely linked, and at least a part of carbon losses (e.g., erosion) from terrestrial forests is buried in mangrove ecosystems. © 2019 The Authors

Sasmito S.D.1, 2 , Kuzyakov Y. 3, 4, 5, 6 , Lubis A.A.7 , Murdiyarso D.2, 8 , Hutley L.B.1 , Bachri S.9 , Friess D.A.10 , Martius C.11 , Borchard N.2, 12
Elsevier B.V.
  • 1 Research Institute for the Environment and Livelihoods (RIEL), Charles Darwin University, Darwin, NT 0810, Australia
  • 2 Center for International Forestry Research (CIFOR), Bogor, 16115, Indonesia
  • 3 Department of Soil Science of Temperate Ecosystems, Georg-August University Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
  • 4 Department of Agricultural Soil Science, Georg-August University Göttingen, Büsgenweg 2, Göttingen, 37077, Germany
  • 5 Institute of Environmental Sciences, Kazan Federal University, Kazan, 420049, Russian Federation
  • 6 Agro-Technological Institute, RUDN University, Moscow, 117198, Russian Federation
  • 7 Center for Isotopes and Radiation Application, National Nuclear Energy Agency (BATAN), Jl. Lebak Bulus Raya No. 49, Jakarta, 12440, Indonesia
  • 8 Department of Geophysics and Meteorology, Bogor Agricultural University, Bogor, 16680, Indonesia
  • 9 Faculty of Agriculture, University of Papua, Manokwari, 98314, Indonesia
  • 10 Department of Geography, National University of Singapore, 1 Arts Link, Singapore, 117570, Singapore
  • 11 Center for International Forestry Research (CIFOR) Germany gGmbH, Bonn, Germany
  • 12 Plant Production, Natural Resources Institute Finland (Luke), Helsinki, 00790, Finland
210Pb sediment dating; Blue carbon; Climate change mitigation; Soil carbon accrual; Soil carbon sequestration; Stable isotopes mixing model
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