scholarly journals Source organic matter analysis of saltmarsh sediments using SIAR and its application in relative sea-level studies in regions of C4plant invasion

Boreas ◽  
2017 ◽  
Vol 46 (4) ◽  
pp. 642-654 ◽  
Author(s):  
Kieran F. Craven ◽  
Robin J. Edwards ◽  
Rory P. Flood
Keyword(s):  
Organic Matter ◽  
Sea Level ◽  
Relative Sea Level ◽  
Source Organic Matter

Relative sea-level changes and organic matter enrichment in the Upper Ordovician-Lower Silurian Wufeng-Longmaxi Formations in the Central Yangtze area, China

2021 ◽  
Vol 124 ◽  
pp. 104809
Author(s):  
Lin Chen ◽  
Shu Jiang ◽  
Ping Chen ◽  
Xiaohong Chen ◽  
Baomin Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sea Level ◽  
Sea Level Changes ◽  
Upper Ordovician ◽  
Relative Sea Level ◽  
Lower Silurian ◽  
Yangtze Area

scholarly journals Global change effects on decomposition processes in tidal wetlands: implications from a global survey using standardized litter

2017 ◽  
Author(s):  
Peter Mueller ◽  
Lisa M. Schile-Beers ◽  
Thomas J. Mozdzer ◽  
Gail L. Chmura ◽  
Thomas Dinter ◽  
...  
Keyword(s):  
Organic Matter ◽  
Global Change ◽  
Sea Level ◽  
Decomposition Rate ◽  
High Sensitivity ◽  
Global Scale ◽  
Tidal Marshes ◽  
Tidal Wetlands ◽  
Coastal Eutrophication ◽  
Relative Sea Level

Abstract. Tidal wetlands, such as tidal marshes and mangroves, are hotspots for carbon sequestration. The preservation of organic matter (OM) is a critical process by which tidal wetlands exert influence over the global carbon cycle and at the same time gain elevation to keep pace with sea-level rise (SLR). The present study provides the first global-scale field-based experimental evidence of temperature and relative sea level effects on the decomposition rate and stabilization of OM in tidal wetlands. The study was conducted in 26 marsh and mangrove sites across four continents, utilizing commercially available standardized OM. While effects on decomposition rate per se were minor, we show unanticipated and combined negative effects of temperature and relative sea level on OM stabilization. Across study sites, OM stabilization was 29 % lower in low, more frequently flooded vs. high, less frequently flooded zones. OM stabilization declined by ~ 90 % over the studied temperature gradient from 10.9 to 28.5 °C, corresponding to a decline of ~ 5 % over a 1 °C temperature increase. Additionally, data from the long-term ecological research site in Massachusetts, US show a pronounced reduction in OM stabilization by > 70 % in response to simulated coastal eutrophication, confirming the high sensitivity of OM stabilization to global change. We therefore provide evidence that rising temperature, accelerated SLR, and coastal eutrophication may decrease the future capacity of tidal wetlands to sequester carbon by affecting the initial transformations of recent OM inputs to soil organic matter.

Submergence, nutrient enrichment, and tropical storm impacts on Spartina alterniflora in the microtidal northern Gulf of Mexico

2020 ◽  
Vol 644 ◽  
pp. 33-45
Author(s):  
JM Hill ◽  
PS Petraitis ◽  
KL Heck
Keyword(s):  
Gulf Of Mexico ◽  
Sea Level Rise ◽  
Sea Level ◽  
Spartina Alterniflora ◽  
Anthropogenic Impacts ◽  
Interactive Effects ◽  
Relative Sea Level ◽  
Hurricane Disturbance ◽  
Submergence Stress ◽  
Relative Sea Level Rise

Salt marshes face chronic anthropogenic impacts such as relative sea level rise and eutrophication, as well as acute disturbances from tropical storms that can affect the productivity of these important communities. However, it is not well understood how marshes already subjected to eutrophication and sea level rise will respond to added effects of episodic storms such as hurricanes. We examined the interactive effects of nutrient addition, sea level rise, and a hurricane on the growth, biomass accumulation, and resilience of the saltmarsh cordgrass Spartina alterniflora in the Gulf of Mexico. In a microtidal marsh, we manipulated nutrient levels and submergence using marsh organs in which cordgrasses were planted at differing intertidal elevations and measured the impacts of Hurricane Isaac, which occurred during the experiment. Prior to the hurricane, grasses at intermediate and high elevations increased in abundance. After the hurricane, all treatments lost approximately 50% of their shoots, demonstrating that added nutrients and elevation did not provide resistance to hurricane disturbance. At the end of the experiment, only the highest elevations had been resilient to the hurricane, with increased above- and belowground growth. Added nutrients provided a modest increase in above- and belowground growth, but only at the highest elevations, suggesting that only elevation will enhance resilience to hurricane disturbance. These results empirically demonstrate that S. alterniflora in microtidal locations already subjected to submergence stress is less able to recover from storm disturbance and suggests we may be underestimating the loss of northern Gulf Coast marshes due to relative sea level rise.

scholarly journals Contributions of Organic and Mineral Matter to Vertical Accretion in Tidal Wetlands across a Chesapeake Bay Subestuary

2021 ◽  
Vol 9 (7) ◽  
pp. 751
Author(s):  
Jenny R. Allen ◽  
Jeffrey C. Cornwell ◽  
Andrew H. Baldwin
Keyword(s):  
Organic Matter ◽  
Sea Level Rise ◽  
Chesapeake Bay ◽  
Sea Level ◽  
210Pb Dating ◽  
Sediment Supply ◽  
Mineral Matter ◽  
Tidal Wetlands ◽  
Vertical Accretion ◽  
Inorganic Matter

Persistence of tidal wetlands under conditions of sea level rise depends on vertical accretion of organic and inorganic matter, which vary in their relative abundance across estuarine gradients. We examined the relative contribution of organic and inorganic matter to vertical soil accretion using lead-210 (210Pb) dating of soil cores collected in tidal wetlands spanning a tidal freshwater to brackish gradient across a Chesapeake Bay subestuary. Only 8 out of the 15 subsites had accretion rates higher than relative sea level rise for the area, with the lowest rates of accretion found in oligohaline marshes in the middle of the subestuary. The mass accumulation of organic and inorganic matter was similar and related (R2 = 0.37). However, owing to its lower density, organic matter contributed 1.5–3 times more toward vertical accretion than inorganic matter. Furthermore, water/porespace associated with organic matter accounted for 82%–94% of the total vertical accretion. These findings demonstrate the key role of organic matter in the persistence of coastal wetlands with low mineral sediment supply, particularly mid-estuary oligohaline marshes.

Salt Marsh Sediments as Recorders of Holocene Relative Sea-Level Change

Salt Marshes ◽  
2021 ◽  
pp. 225-256
Author(s):  
W. Roland Gehrels ◽  
Andrew C. Kemp
Keyword(s):  
Salt Marsh ◽  
Sea Level ◽  
Sea Level Change ◽  
Relative Sea Level ◽  
Level Change ◽  
Marsh Sediments ◽  
Salt Marsh Sediments

Holocene rise of relative sea level at Sable Island, Nova Scotia, Canada: Correction and note

Geology ◽  
1985 ◽  
Vol 13 (9) ◽  
pp. 661 ◽  
Author(s):  
Alan Ruffman ◽  
Ann A. L. Miller ◽  
David B. Scott
Keyword(s):  
Nova Scotia ◽  
Sea Level ◽  
Relative Sea Level
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