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Beach-cast seagrass wrack contributes substantially to global greenhouse gas emissions
Liu, Songlin; Trevathan-Tackett, Stacey M.; Lewis, Carolyn J. Ewers; Ollivier, Quinn R.; Jiang, Zhijian; Huang, Xiaoping; Macreadie, Peter I.
AbstractSeagrass ecosystems have received a great deal of attention recently for their ability to capture and store carbon, thereby helping to mitigate climate change. However, their carbon-sink capacity could be offset somewhat if exported plant material - which accounts for similar to 90% of total leaf production - undergoes microbial breakdown and is emitted into the atmosphere as a greenhouse gas. Here we measured emissions (CO2 and CH4) from the breakdown of exported seagrass plant material, focusing on beach-cast 'wrack'. We tested two seagrass species; Zostera nigricaulis and Amphibolis antarctica, which have contrasting morphologies and chemistries. We found that both species of wrack were substantial sources of CO2, but not CH4, during the decomposition process. Biomass loss and the coinciding CO2 emissions occurred over the 30-day experiment, and the pattern of CO2 emissions over this time followed a double exponential model (R-2 > 0.92). The initial flux rate was relatively high, most likely due to rapid leaching of labile compounds, then decreased substantially within the 2-9 days, and stabilizing at < 3 mu mol g(-1) d(-1) during the remaining decomposition period. Additionally, seagrass wrack cast high up on beaches that remained dry had 72% lower emissions than wrack that was subjected to repeated wetting in the intertidal zone. This implies that relocation of seagrass wrack by coastal resource managers (e.g. from water's edge to drier dune areas) could help to reduce atmospheric CO2 emissions. Scaling up, we estimate the annual CO2-C flux from seagrass wrack globally is between 1.31 and 19.04 Tg C yr(-1), which is equivalent to annual emissions of 0.63-9.19 million Chinese citizens. With climate change and increasing coastal development expected to accelerate the rate of wrack accumulation on beaches, this study provides timely information for developing coastal carbon budgets.
KeywordSeagrass wrack Decomposition Moisture Carbon dioxide Flux Shoreline management
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China
2.Liu, Songlin; Trevathan-Tackett, Stacey M.; Lewis, Carolyn J. Ewers; Ollivier, Quinn R.; Macreadie, Peter I.] Deakin Univ, Ctr Integrat Ecol, Sch Life & Environm Sci, Burwood, Vic 3125, Australia
Recommended Citation
GB/T 7714
Liu, Songlin,Trevathan-Tackett, Stacey M.,Lewis, Carolyn J. Ewers,et al. Beach-cast seagrass wrack contributes substantially to global greenhouse gas emissions[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2019,231:329, 335.
APA Liu, Songlin.,Trevathan-Tackett, Stacey M..,Lewis, Carolyn J. Ewers.,Ollivier, Quinn R..,Jiang, Zhijian.,...&Macreadie, Peter I..(2019).Beach-cast seagrass wrack contributes substantially to global greenhouse gas emissions.JOURNAL OF ENVIRONMENTAL MANAGEMENT,231,329.
MLA Liu, Songlin,et al."Beach-cast seagrass wrack contributes substantially to global greenhouse gas emissions".JOURNAL OF ENVIRONMENTAL MANAGEMENT 231(2019):329.
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