DOI: 10.5061/dryad.m0cfxpp9x
title: Data from: Rising sea level reduces carbon sequestration, CO<sub>2</sub>, and N<sub>2</sub>O flux while promoting CH<sub>4</sub> flux from Mangroves

description: Sea-level rise (SLR) may offset gains made by enhancing mangrove carbon
 sequestration through greater greenhouse gas emissions. However, accurate
 prediction of greenhouse gas (GHG) fluxes under future SLR is still
 relatively uncertain. In this study, we implemented a series of
 “marsh-organ” designs (experimental platforms at different elevations)
 along a latitudinal gradient in China, simulating four sea-level
 scenarios. We investigated the factors driving the patterns observed in
 ecosystem respiration (Reco), methane (CH4), and nitrous oxide (N2O)
 fluxes from mangroves and adjacent mudflats. We examined environmental
 factors, soil properties, and net ecosystem productivity (NEP), and we
 used structural equation models to map functional process impacts on GHG
 fluxes. Our findings revealed that SLR reduced NEP, Reco, and N2O fluxes
 while increasing CH4 emissions in both mudflat and mangroves. SLR and
 latitudinal distribution significantly altered biological and abiotic
 factors that influenced GHG fluxes. The present Reco for mudflat and
 mangroves ranged from 230 to 1640 g m-2 year-1, with 0.32 to 0.88 g m-2
 year-1 in CH4 emissions and 0.02 to 0.29 g m-2 year-1 in N2O emissions.
 The net global warming potential (GWP) from current mangrove GHG emissions
 is -10,897 to -1093 gCO2 m-2 year-1 at Yunxiao, followed by -4113 to -246
 gCO2 m-2 year-1 at Haikou and -987 to -83 gCO2 m-2 year-1 at Aojiang. SLR
 stimulated CH4 emissions in mangroves increased by 20% in RCP 4.5 and by
 12% in RCP 8.5, versus the current sea level by 2100. In contrast, SLR
 markedly inhibited Reco and N2O emissions by 42% to 56% and 23% to 32%,
 respectively. Moreover, NEP experienced a decrease from 27% to 50%,
 indicating a projected 24% to 51% reduction in the capacity for mangroves
 to mitigate climate change through reduced GHG emissions with SLR in the
 future.
description: # Data from: Rising sea level reduces carbon sequestration, CO~2~, and
 N~2~O flux while promoting CH~4~ flux from Mangroves Dataset DOI:
 [10.5061/dryad.m0cfxpp9x](https://doi.org/10.5061/dryad.m0cfxpp9x) ##
 Description of the data and file structure This database links with Qiao
 et al, 2025, Rising sea level reduces carbon sequestration and CO~2~ and
 N~2~O fluxes while promoting CH~4~ flux from
 mangroves. [https://doi.org/10.1016/j.crsus.2025.100520](https://doi.org/10.1016/j.crsus.2025.100520). ### Files and variables #### File: Database.xlsx #### Abbreviation Definitions (units) * Lat: Latitude - SLR: sea-level rise (cm) * Comm: Community - Tair: Air temperature (^o^C) * Tsoil: Soil temperature (^o^C) - Eh: Redox potential (mV) * Ec: Conductivity (ms/cm) - C: Total carbon content (%) * N: Nitrogen content  (%) - S: Sulfur content  (%) * Reco: ecosystem respiration (gCO~2~ m ^-2^ year ^-1^) - CH~4~: methane flux (gCH~4~ m ^-2^ year ^-1^) * N~2~O: nitrous oxide (gN~2~O m ^-2^ year ^-1^) - GWP: global warming potential (kgCO~2-e~ m ^-2^ year ^-1^) * Temp: The first principal component from PCA of air and soil temperature - Properties: The first principal component from PCA of pH, Eh Ec * Nutrients: The first principal component from PCA of N, S - NEP: Net ecosystem productivity (kg m ^-2^ year ^-1^) ## Access information Other publicly accessible locations of the data: * Qiao et al, 2025, Rising sea level reduces carbon sequestration and CO2 and N2O fluxes while promoting CH4 flux from mangroves, Cell Reports Sustainability, 2, 100520. [https://doi.org/10.1016/j.crsus.2025.100520](https://doi.org/10.1016/j.crsus.2025.100520)