Dynamics of sediment carbon stocks across intertidal wetland habitats of Moreton Bay, Australia

Global Change Biology, Journal Year: 2017, Volume and Issue: 23(10), P. 4222 - 4234

Published: April 13, 2017

Abstract Coastal wetlands are known for high carbon storage within their sediments, but our understanding of the variation in among intertidal habitats, particularly over geomorphological settings and along elevation gradients, is limited. Here, we collected 352 cores from 18 sites across Moreton Bay, Australia. We assessed sediment organic ( OC ) stocks different (wetlands riverine with those reduced influence located on tide‐dominated sand islands), distance shore habitat vegetation types. used mid‐infrared MIR spectroscopy combined analytical data partial least squares regression to quantify content ~2500 samples provide fine‐scale spatial coverage 150 cm depth. found river deltas had larger (175–504 Mg/ha) than nonriverine (44–271 Mg/ha). Variation was comparison mixed geomorphic settings, closer outflow east south Bay having higher islands northwest bay. Sediment increased not settings. did differ between mangrove saltmarsh habitats. did, however, dominant species research area At landscape scale, coastal South East Queensland catchments (17,792 ha) comprised approximately 4,100,000–5,200,000 Mg . Comparatively indicates that availability mineral sediments terrestrial derived may exert a strong potential wetland systems.

Language: Английский

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Environmental drivers of sediment carbon storage in temperate seagrass meadows

Hydrobiologia, Journal Year: 2019, Volume and Issue: 847(7), P. 1773 - 1792

Published: Dec. 21, 2019

Language: Английский

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A Synthesis of Blue Carbon Stocks, Sources, and Accumulation Rates in Eelgrass (Zostera marina) Meadows in the Northeast Pacific

Global Biogeochemical Cycles, Journal Year: 2020, Volume and Issue: 34(2)

Published: Jan. 6, 2020

Abstract There is increasing urgency to implement climate change mitigation strategies that enhance greenhouse gas removal from the atmosphere and reduce carbon dioxide (CO 2 ) emissions. Recently, coastal “blue carbon” habitats⁠—mangroves, salt marshes, seagrass meadows—have received attention for their ability capture CO store organic (OC), primarily in sediments. Across habitat types regions, however, information about sequestration rates sources of local sediments remains sparse. Here we compiled recently obtained estimates sediment OC stocks 139 cores collected temperate ( Zostera marina meadows Alaska, British Columbia, Washington, Oregon. all content averaged 0.75%. Organic top 25 cm 1 m 1,846 7,168 g −2 , respectively. Carbon ranged 4.6 93.0 yr −1 24.8 . Isotopic data this region suggest largely noneelgrass sources. In general, these values are comparable those other Z. meadows, but significantly lower than previously reported seagrasses globally. These results further highlight need species‐level quantification blue parameters. While eelgrass may not sequester as much elsewhere, policy incentives should still be implemented protect existing critical ecosystem services associated with habitats.

Language: Английский

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Carbon and Nitrogen Stocks and Burial Rates in Intertidal Vegetated Habitats of a Mesotidal Coastal Lagoon

Ecosystems, Journal Year: 2021, Volume and Issue: 25(2), P. 372 - 386

Published: June 22, 2021

Language: Английский

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Major impacts and societal costs of seagrass loss on sediment carbon and nitrogen stocks

Ecosphere, Journal Year: 2021, Volume and Issue: 12(7)

Published: July 1, 2021

Abstract Seagrass meadows constitute important carbon sinks, and the ongoing global loss of seagrass habitats raises concerns about release stored in their sediments. However, actual consequences for nutrients remain unclear. Here, we take advantage well‐documented historic losses eelgrass ( Zostera marina ) along Swedish NW coast to assess how contents organic (C) nitrogen (N) sediment change when a meadow is lost. We find unusually high C N (on average 3.7% 0.39% DW, respectively) sediments down >100 cm depth, suggesting that these hot spots storage. stocks were strongly influenced by wave exposure almost twice as sheltered compared exposed meadows. The composition stable isotope values distinctly different areas have lost meadows, with on >2.6 times lower N. results indicate an erosion >35 following historical loss, more vulnerable stocks. suggest has resulted 60.2 Mg 6.63 per hectare, estimated economic cost society 7944 141,355 US$/ha, respectively. value storage represents one highest monetary presented ecosystem service provided seagrasses shows are particularly mitigating eutrophication. Following documented approximately 10 km 2 study area, it over 60,000 was released coastal environment 20‐yr period, which constitutes three annual river load coast. exemplifies significant role sinks both nutrients, risk nutrient vegetation should be taken into account spatial management other habitats.

Language: Английский

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Green Nourishment: An Innovative Nature-Based Solution for Coastal Erosion

Frontiers in Marine Science, Journal Year: 2022, Volume and Issue: 8

Published: Feb. 9, 2022

Coastal erosion poses an urgent threat to life and property in low-lying regions. Sand nourishment is increasingly used as a nature-based solution but requires significant natural resources replenishment over time. In this study, novel form of explored that combines shoreface seagrass restoration mitigate coastal (i.e., green nourishment). Using the morphodynamic model Xbeach, impact planting on wave energy dissipation, sediment transport, morphological evolution cross-shore profile was studied for mild conditions intense storm. Model results indicate meadow enhances dissipation provided by nourishment, suggests it may be particularly effective transport mitigation when implemented sheltered nearshore area. The reduced height meadow, rate destruction deposition or above grass after storm event. Green also beach foreshore caused simulated An alternative, more cost-effective technique using seeds explored, which showed similar protection benefits transplants. This modeling study found potentially flooding sandy coasts, future studies are recommended evaluate its morphological, ecological flood risk reduction field.

Language: Английский

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Capturing of organic carbon and nitrogen in eelgrass sediments of southern Scandinavia

Limnology and Oceanography, Journal Year: 2023, Volume and Issue: 68(3), P. 631 - 648

Published: Jan. 13, 2023

Abstract The ability of seagrass meadows to filter nutrients and capture store CO 2 in the form organic carbon (OC) nitrogen (N) their sediments may help mitigate local eutrophication as well climate change via meadow restoration protection. This study assesses OC N sediment stocks (top 50 cm) sequestration rates within Danish eelgrass meadows. At four locations, eelgrass‐vegetated nearby unvegetated plots were studied protected exposed areas. average cm 2.6 ± 0.3 kg m −2 0.23 0.01 , including vegetated plots. In general, did not differ significantly between sediments. Lack accumulation excess 210 Pb suggested erosion or low at most sites. ranged from 6 134 g yr −1 0.7 14 . Generalized additive models showed that ≥ 80% variation was explained by grain size, matter source, hydrodynamic exposure. Long cores, dated with Pb, declining densities toward present time, suggesting long‐term declines pools. Estimates potential nation‐wide show they could annually up 0.7% 0.5% emissions 6.9% 5.2% total terrestrial load.

Language: Английский

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Drivers of variability in Blue Carbon stocks and burial rates across European estuarine habitats

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 886, P. 163957 - 163957

Published: May 8, 2023

The implementation of climate change mitigation strategies based on the conservation and restoration Blue Carbon ecosystems requires a deep understanding magnitude variability in organic carbon (Corg) storage across within these ecosystems. This study explored soil Corg stocks burial rates intertidal estuarine habitats Atlantic European coast its relation to biotic abiotic drivers. A total 136 cores were collected saltmarshes located at different tidal zones (high marsh, N = 45; low 30), seagrass meadows (N 17) flats 44), from inner outer sections five estuaries characterized by basin land uses. Soil higher high-marsh communities (65 ± 3 Mg ha-1) than low-marsh (38 ha-1), (40 5 unvegetated (46 whereas also tended be high marshes (62 13 g m-2 y-1) compared (43 15 (35 9 y-1). decreased most reflecting decrease river influence towards estuary mouth. Higher related content silt clay proportion forest natural basin, pointing new opportunities for protecting coastal sinks upland Our contributes global inventory adding data unexplored regions Europe, identifying drivers estuaries.

Language: Английский

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Patterns and drivers of macroalgal ‘blue carbon’ transport and deposition in near-shore coastal environments

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 890, P. 164430 - 164430

Published: May 27, 2023

The role of macroalgae (seaweed) as a global contributor to carbon drawdown within marine sediments - termed 'blue carbon' remains uncertain and controversial. While studies are needed validate the potential for macroalgal‑carbon sequestration in coastal sediments, fundamental questions regarding fate dislodged macroalgal biomass need be addressed. Evidence suggests may advected deposited other vegetated ecosystems down deep ocean; however, contributions near-shore waters remain uncertain. In this study combination eDNA metabarcoding surficial sediment sampling informed by seabed mapping from different physical environments was used test presence south-eastern Australia, factors influencing patterns transport deposition. DNA products total 68 taxa, representing all major groups (Phaeophyceae, Rhodophyta, Chlorophyta) were successfully detected at 112 locations. These findings confirm exported into suggest donors could both speciose diverse. Modelling suggested that deposition, organic (TOC), influenced complex interactions between several environmental including water depth, grain size, wave orbital velocity, current speed, direction, extent infralittoral zone around depositional areas. Extrapolation optimised model predict spatial deposition TOC across coastline identify potentially important sinks. This builds on recent providing empirical evidence deposits framework predicting distribution sinks informing future surveys aimed determining long-term sediments.

Language: Английский

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Maximizing blue carbon stocks through saltmarsh restoration

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: March 30, 2023

Political discourse around coastal wetland restoration and blue carbon management strategies has increased in the past decade, yet storage neither been a reason for restoration, nor criterion to measure success of current saltmarsh schemes UK. To maximise climate change mitigation through knowledge on key drivers stock variability is required. We use restored saltmarshes similar age, paired with adjacent natural marshes as references, identify stocks following managed realignment within an estuary southeastern England. From surficial soil cores (top 30 cm), we measured alongside environmental characteristics. Carbon between sites were after ~ years when above mean high water neap (MHWN) tidal levels. Elevated marsh platforms likely provide suitable conditions development mature plant communities associated greater capture production organic carbon. The site at Tollesbury (Essex, UK) had 2-fold lower than other estuary. attribute this site’s low position frame, below MHWN levels, coupled sediment supply dominance pioneer communities. As anticipated become important facet recommend that levels are selected or preference given coastlines may rapidly elevate MHWN. Alternatively, elevation could be artificially raised prior realignment. Restoration aiming should also encourage establishment species (e.g., Atriplex portulacoides our study) enhance stocks. However, overall goal ought carefully considered trade-offs ecosystem services ensue if alone pursued.

Language: Английский

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