Influence of Spartina and Juncus on saltmarsh sediments. III. Organic geochemistry

Gebrehiwet, T.; Koretsky, Carla M.; Krishnamurthy, Ramanarayanan

doi:10.1016/j.chemgeo.2008.06.015

Cited by 39 publications

(25 citation statements)

References 30 publications

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“…; Goñi & Thomas ; Gebrehiwet et al . ). Comparison of C:N values in modern sediment and samples from JT2012 demonstrates that C:N values increased following deposition through either preferential loss of nitrogen, or enrichment with additional carbon (Fig.…”

Section: Discussionmentioning

confidence: 97%

The distribution and utility of sea‐level indicators in Eurasian sub‐Arctic salt marshes (White Sea, Russia)

Kemp

Horton

Nikitina

et al. 2017

Boreas

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In support of efforts to reconstruct relative sea level (RSL), we investigated the utility of foraminifera, diatoms and bulk-sediment geochemistry (d 13 C, C:N and parameters measured by Rock-Eval pyrolysis) as sea-level indicators in Eurasian sub-Arctic salt marshes. At three salt marshes (<15 km apart) in Dvina Bay (White Sea, Russia), we collected surface sediment samples along transects from subtidal to Taiga forest environments. Foraminifera at all sites formed bipartite assemblages, where elevations below mean high higher water (MHHW) were dominated by Miliammina spp. and elevations between MHHW and the highest occurrence of foraminifera were dominated by Jadammina macrescens and Balticammina pseudomacrescens. Five high-diversity groups of diatoms were identified and they displayed pronounced variability amongst the study sites. Bulk-sediment geochemistry recognized two groups (clastic-dominated environments below MHHW and organic-rich environments above MHHW). As one group included subtidal elevations and the other included supratidal elevations, we conclude that the measured geochemical parameters are not stand-alone sea-level indicators. Core JT2012 captured a regressive sediment succession of clastic, tidal-flat sediment overlain by salt-marsh organic silt and freshwater peat. The saltmarsh sediment accumulated at 2804AE52 years before present and preserved foraminifera (Jadammina macrescens and Balticammina pseudomacrescens) with good analogy to modern assemblages indicating that RSL was +2.60AE0.47 m at this time. Diatoms confirm that marine influence decreased through time, but the lack of analogy between modern and core assemblages limited their utility as sea-level indicators. Geochemical parameters also indicate a reduction in marine influence through time. We conclude that RSL reconstructions derived from salt-marsh sediment preserved beneath Eurasian sub-Arctic peatlands can provide valuable insight into the spatio-temporal evolution of the Fennoscandian and Eurasian ice sheets.

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Section: Discussionmentioning

confidence: 97%

The distribution and utility of sea‐level indicators in Eurasian sub‐Arctic salt marshes (White Sea, Russia)

Kemp

Horton

Nikitina

et al. 2017

Boreas

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“…Potential sources of organic C include allochthonous contributions from upland plants, marsh macrophytes, and phytoplankton. In a Georgia salt marsh, 75% of the soil organic C was estimated to be derived from phytoplankton, based on C/N and δ 13 C org values (Gebrehiwet et al 2008). In our study biomass and other sources of organic C smaller than the 1 mm mesh size comprised 64-93% of soil C.…”

Section: Pool Dynamicsmentioning

confidence: 99%

Salt Marsh Carbon Pool Distribution in a Mid-Atlantic Lagoon, USA: Sea Level Rise Implications

et al. 2011

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The distribution of carbon (C) within a salt marsh may vary among vegetation zones depending on production and decomposition dynamics and organic and mineral depositional history. We examined spatial and temporal variation of plant and soil C pools within a salt marsh fringing a coastal lagoon along the mid-Atlantic coast of the U.S. The total plant C pool increased from high marsh shrub to low marsh grass dominated areas. Much of the spatial variation in plant C pool was due to fine roots and small organic matter (dlm) that could not be identified by species, which averaged 2398 gC m −2 in Spartina patens-dominated, 2215 gC m −2 in Spartina alternifloradominated, and 676 gC m −2 in Juncus roemerianusdominated areas. Belowground C pool loss was 36% less for S.patens than S.alterniflora and was similar between S. alterniflora and J.roemerianus. Accretion and C accumulation rates were greater in the S.alterniflora-dominated stand than in the J.roemerianus-dominated stand. Our results suggest that landward migration onto terrestrial soils can lead to an estimated 80% increase in belowground plant C composed primarily of fine roots and dlm and 36-70% increase in soil carbon between 15 and 30 cm depths.

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“…Additionally, tidal pumping also regulated the soil carbon pool in coastal salt marshes (Zhou et al, 2009). For instance, increased SOC in Spartina alterniflora salt marsh was partly owing to the contribution of phytoplankton (Gebrehiwet et al, 2008).…”

Section: The Vertical Distribution Pattern Of Soc In Coastal Salt Marmentioning

confidence: 99%

Soil Organic Carbon Contents and Stocks in Coastal Salt Marshes with Spartina alterniflora Following an Invasion Chronosequence in the Yellow River Delta, China

et al. 2018

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Plant invasion alters the fundamental structure and function of native ecosystems by affecting the biogeochemical pools and fluxes of materials and energy. Native (Suaeda salsa) and invasive (Spartina alterniflora) salt marshes were selected to study the effects of Spartina alterniflora invasion on soil organic carbon (SOC) contents and stocks in the Yellow River Delta. Results showed that the SOC contents (g/kg) and stocks (kg/m 2) were significantly increased (P < 0.05) after Spartina alterniflora invasion of seven years, especially for the surface soil layer (0-20 cm). The SOC contents exhibited an even distribution along the soil profiles in native salt marshes, while the SOC contents were gradually decreased with depth after Spartina alterniflora invasion of seven years. The natural ln response ratios (LnRR) were applied to identify the effects of short-term Spartina alterniflora invasion on the SOC stocks. We also found that Spartina alterniflora invasion might cause soil organic carbon losses in a short-term phase (2-4 years in this study) due to the negative LnRR values, especially for 20-60 cm depth. And the SOCD in surface layer (0-20 cm) do not increase linearly with the invasive age. Spearman correlation analysis revealed that silt + clay content was exponentially related with SOC in surface layer (Adjusted R 2 = 0.43, P < 0.001), suggesting that soil texture could play a key role in SOC sequestration of coastal salt marshes.

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Influence of Spartina and Juncus on saltmarsh sediments. III. Organic geochemistry

Cited by 39 publications

References 30 publications

The distribution and utility of sea‐level indicators in Eurasian sub‐Arctic salt marshes (White Sea, Russia)

The distribution and utility of sea‐level indicators in Eurasian sub‐Arctic salt marshes (White Sea, Russia)

Salt Marsh Carbon Pool Distribution in a Mid-Atlantic Lagoon, USA: Sea Level Rise Implications

Soil Organic Carbon Contents and Stocks in Coastal Salt Marshes with Spartina alterniflora Following an Invasion Chronosequence in the Yellow River Delta, China

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