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Dynamics and fate of blue carbon in a mangrove-seagrass seascape: influence of landscape configuration and land-use change
University of Gothenburg, Sweden.
Stockholm University, Sweden.
Stockholm University, Sweden; University of Dar Salaam, Tanzania.
Autonomous University of Barcelona, Spain; University of California Berkeley, USA.
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2021 (Engelska)Ingår i: Landscape Ecology, ISSN 0921-2973, E-ISSN 1572-9761, Vol. 36, s. 1489-1509Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Context Seagrass meadows act as efficient natural carbon sinks by sequestering atmospheric CO2 and through trapping of allochthonous organic material, thereby preserving organic carbon (C-org) in their sediments. Less understood is the influence of landscape configuration and transformation (land-use change) on carbon sequestration dynamics in coastal seascapes across the land-sea interface. Objectives We explored the influence of landscape configuration and degradation of adjacent mangroves on the dynamics and fate of C-org in seagrass habitats. Methods Through predictive modelling, we assessed sedimentary C-org content, stocks and source composition in multiple seascapes (km-wide buffer zones) dominated by different seagrass communities in northwest Madagascar. The study area encompassed seagrass meadows adjacent to intact and deforested mangroves. Results The sedimentary C-org content was influenced by a combination of landscape metrics and inherent habitat plant- and sediment-properties. We found a strong land-to-sea gradient, likely driven by hydrodynamic forces, generating distinct patterns in sedimentary C-org levels in seagrass seascapes. There was higher C-org content and a mangrove signal in seagrass surface sediments closer to the deforested mangrove area, possibly due to an escalated export of C-org from deforested mangrove soils. Seascapes comprising large continuous seagrass meadows had higher sedimentary C-org levels in comparison to more diverse and patchy seascapes. Conclusion Our results emphasize the benefit to consider the influence of seascape configuration and connectivity to accurately assess C-org content in coastal habitats. Understanding spatial patterns of variability and what is driving the observed patterns is useful for identifying carbon sink hotspots and develop management prioritizations.

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Springer, 2021. Vol. 36, s. 1489-1509
Nyckelord [en]
Seascape connectivity, Land–, sea interface, Mangrove deforestation, Seagrass meadows, Sedimentary carbon storage
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Ekologi
Identifikatorer
URN: urn:nbn:se:sh:diva-44516DOI: 10.1007/s10980-021-01216-8ISI: 000623133500001Scopus ID: 2-s2.0-85101816868OAI: oai:DiVA.org:sh-44516DiVA, id: diva2:1536930
Tillgänglig från: 2021-03-12 Skapad: 2021-03-12 Senast uppdaterad: 2021-05-03Bibliografiskt granskad

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Gullström, Martin

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Totalt: 238 träffar
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