A simple and robust procedure for coring unconsolidated sediment in shallow water

Adachi, Hiroshi; Yamano, Hiroya; Miyajima, Toshihiro; Nakaoka, Masahiro

doi:10.1007/s10872-010-0070-4

Cited by 14 publications

(9 citation statements)

References 17 publications

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“…Sediment cores used in this study were collected using the percussion corer equipped with a PVC pipe (inner diameter, 40 mm for temperate and subtropical sites, 60 mm for tropical sites) [ Adachi et al ., ], except for cores Z4 and Z5, which were obtained using an acrylic piston corer (length, 2 m; inner diameter, 60 mm). Sediment cores were sliced into ~10 cm (temperate and subtropical samples) or 5 cm (tropical samples) sections on the day of sampling.…”

Section: Methodsmentioning

confidence: 99%

Geographic variability in organic carbon stock and accumulation rate in sediments of East and Southeast Asian seagrass meadows

Miyajima

Hori

Hamaguchi

et al. 2015

Global Biogeochemical Cycles

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Organic carbon (OC) stored in the sediments of seagrass meadows has been considered a globally significant OC reservoir. However, the sparsity and regional bias of studies on long-term OC accumulation in coastal sediments have limited reliable estimation of the capacity of seagrass meadows as a global OC sink. We evaluated the amount and accumulation rate of OC in sediment of seagrass meadows and adjacent areas in East and Southeast Asia. In temperate sites, the average OC concentration in the top 30 cm of sediment was higher in seagrass meadows (780-1080 μmol g . Carbon isotope mass balancing suggested that the contribution of seagrass-derived carbon to OC stored in sediments was often relatively minor (temperate: 10-40%; subtropical: 35-82%; tropical: 4-34%) and correlated to the habitat type, being particularly low in estuarine habitats. Stock of OC in the top meter of sediment of all the studied meadows ranged from 38 to 120 Mg ha À1 . The sediment accumulation rates were estimated by radiocarbon dating of six selected cores (0.32-1.34 mm yr À1). The long-term OC accumulation rates calculated from the sediment accumulation rate and the top 30 cm average OC concentration for the seagrass meadows (24-101 kg ha À1 yr À1 ) were considerably lower than the OC accumulation rates previously reported for Mediterranean Posidonia oceanica meadows (580 kg ha À1 yr À1 on average). Current estimates for the global carbon sink capacity of seagrass meadows, which rely largely on Mediterranean studies, may be considerable overestimations.

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Section: Methodsmentioning

confidence: 99%

Geographic variability in organic carbon stock and accumulation rate in sediments of East and Southeast Asian seagrass meadows

Miyajima

Hori

Hamaguchi

et al. 2015

Global Biogeochemical Cycles

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136

115

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“…We collected surface sediment cores from intertidal and subtidal seagrass meadows (11 sites), bare areas adjacent to seagrass meadows (2 sites), subtidal macroalgal beds (8 sites), and unvegetated estuarine intertidal flats (5 sites) using a hand‐operated knocking corer or a piston corer (Adachi et al ) during 2009–2012. Collected cores were immediately cut into ∼10 cm sections, and in this study only the top 30 cm sections were used for further analyses.…”

Section: Methodsmentioning

confidence: 99%

Geophysical constraints for organic carbon sequestration capacity of Zostera marina seagrass meadows and surrounding habitats

Miyajima

Hori

Hamaguchi

et al. 2017

Limnology & Oceanography

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To elucidate the factors determining the organic carbon (OC) sequestration capacity of seagrass meadows, the distribution of OC and the fraction of seagrass-derived OC in sediments of the temperate cosmopolitan seagrass Zostera marina meadows and surrounding habitats were investigated in relation to physical properties of sedimentary materials. On average, seagrass meadow sediments showed OC levels twofold higher than other shallow nearshore habitats. However, offshore sediments often showed greater OC concentrations than average seagrass meadow sediments. According to estimations of OC sources based on carbon isotope ratios, 8-55% and 14-24% of OC in nonestuarine seagrass meadow sediments and < 30 m deep offshore sediments, respectively, were assigned to seagrass origin. The OC concentration in seagrass meadow and offshore sediments closely correlated to the specific surface area (SSA) of sediment (r 2 5 0.816 and 0.755, respectively; p < 0.0001),with an average OC loading per sediment surface area of approximately 60 lmol m 22. In seagrass meadow sediments, the fraction of seagrass-derived OC was also greater in samples with a larger SSA, and the seagrassderived OC occurred preferentially in sediment grains that had a specific gravity exceeding 2.0, namely, in a form closely associated with sediment minerals. The OC concentration, the fraction of seagrass-derived OC, and the SSA were positively correlated to the logarithm of areal extent of individual seagrass meadows (p < 0.01). These findings suggest that the OC sequestration capacity of nearshore vegetated habitats is under the primary control of geophysical constraints such as sediment supply rate and depositional conditions. Vegetated shallow coastal ecosystems, including intertidal salt marshes, mangroves, and seagrass meadows have been ranked among the most efficient biotic systems for accumulating organic carbon (OC) on an areal basis (McLeod et al. 2011;Fourqurean et al. 2012). It is estimated that these ecosystems may contribute almost half of OC burial in the global ocean even though they cover < 2% of the ocean surface (Duarte et al. 2005). Recent interest has focused on the potential to incorporate these ecosystems, called "blue forests," into policies for reducing carbon dioxide (CO 2 ) emissions. At the same time, there is increased concern about the possibility of CO 2 emissions caused by the decline of blue forest ecosystems, including the seagrass meadows (Pendleton et al. 2012;Grimsditch et al. 2013).High rates of OC accumulation in seagrass meadows are likely the result of specific ecosystem functions such as (1) extremely high primary productivity of seagrasses and associated microalgae, (2) efficient trapping of organic particles within the meadow sediment via its flow-regulation and bottom-stabilization effects, and (3) slowness of remineralization of OC within the meadow sediment due to the anoxic conditions that prevail (Duarte et al. 2013). Most of the OC stored in seagrass meadows exists as detrital OC derived from seagrasses...

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“…Six long sediment cores (2‐m length) were collected in October 2012 from seagrass meadows in Furen Lagoon (3 sites) and Hichirippu Lagoon (3 sites) using a hand‐operated knocking corer equipped with a PVC pipe (Adachi, Yamano, Miyajima, & Nakaoka, ) or a hand‐operated piston corer. All long cores were sealed at both ends and transported to the laboratory, where they were immediately processed.…”

Section: Methodsmentioning

confidence: 99%

Relative sea‐level change regulates organic carbon accumulation in coastal habitats

Watanabe

Seike

Kajihara

et al. 2019

Global Change Biology

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Because coastal habitats store large amounts of organic carbon (Corg), the conservation and restoration of these habitats are considered to be important measures for mitigating global climate change. Although future sea‐level rise is predicted to change the characteristics of these habitats, its impact on their rate of Corg sequestration is highly uncertain. Here we used historical depositional records to show that relative sea‐level (RSL) changes regulated Corg accumulation rates in boreal contiguous seagrass–saltmarsh habitats. Age–depth modeling and geological and biogeochemical approaches indicated that Corg accumulation rates varied as a function of changes in depositional environments and habitat relocations. In particular, Corg accumulation rates were enhanced in subtidal seagrass meadows during times of RSL rise, which were caused by postseismic land subsidence and climate change. Our findings identify historical analogs for the future impact of RSL rise driven by global climate change on rates of Corg sequestration in coastal habitats.

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A simple and robust procedure for coring unconsolidated sediment in shallow water

Cited by 14 publications

References 17 publications

Geographic variability in organic carbon stock and accumulation rate in sediments of East and Southeast Asian seagrass meadows

Geographic variability in organic carbon stock and accumulation rate in sediments of East and Southeast Asian seagrass meadows

Geophysical constraints for organic carbon sequestration capacity of Zostera marina seagrass meadows and surrounding habitats

Relative sea‐level change regulates organic carbon accumulation in coastal habitats

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