Post-depositional redistribution and gradual accumulation of 137Cs in a riparian wetland ecosystem in Sweden

Stark, Karolina; Wallberg, Petra; Nylén, Torbjörn

doi:10.1016/j.jenvrad.2005.11.008

Cited by 18 publications

(16 citation statements)

References 24 publications

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“…If compaction occurred during sampling, the core was discarded and sampling of that individual core was repeated. Soil cores were spaced within 40 cm of each other, forming a triangular pattern, to consider deposition variation within the site [37,38]. After extraction from the substrate, the soil cores were measured for length, capped, and sealed at both ends, and stored at 4˝C to suspend microbial activity and volatilization of labile carbon.…”

Section: Soil Sampling and Preparationmentioning

confidence: 99%

Carbon Sequestration and Sedimentation in Mangrove Swamps Influenced by Hydrogeomorphic Conditions and Urbanization in Southwest Florida

Marchio

Savarese

Bovard

et al. 2016

Forests

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This study compares carbon sequestration rates along two independent tidal mangrove creeks near Naples Bay in Southwest Florida, USA. One tidal creek is hydrologically disturbed due to upstream land use changes; the other is an undisturbed reference creek. Soil cores were collected in basin, fringe, and riverine hydrogeomorphic settings along each of the two tidal creeks and analyzed for bulk density, total organic carbon profiles, and sediment accretion. Radionuclides 137 Cs and 210 Pb were used to estimate recent sediment accretion and carbon sequestration rates.Carbon sequestration rates (mean˘standard error) for seven sites in the two tidal creeks on the Naples Bay (98˘12 g-C m´2¨year´1 (n = 18)) are lower than published global means for mangrove wetlands, but consistent with other estimates from the same region. Mean carbon sequestration rates in the reference riverine setting were highest (162˘5 g-C m´2¨year´1), followed by rates in the reference fringe and disturbed riverine settings (127˘6 and 125˘5 g-C m´2¨year´1, respectively). The disturbed fringe sequestered 73˘10 g-C m´2¨year´1, while rates within the basin settings were 50˘4 g-C m´2¨year´1 and 47˘4 g-C m´2¨year´1 for the reference and disturbed creeks, respectively. These data support our hypothesis that mangroves along a hydrologically disturbed tidal creek sequestered less carbon than did mangroves along an adjacent undisturbed reference creek.

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Section: Soil Sampling and Preparationmentioning

confidence: 99%

Carbon Sequestration and Sedimentation in Mangrove Swamps Influenced by Hydrogeomorphic Conditions and Urbanization in Southwest Florida

Marchio

Savarese

Bovard

et al. 2016

Forests

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“…The swamp received fallout following the Chernobyl accident in 1986. Verkmyra Stream floods the swamp every spring, resulting in deposition of radioactive material, mainly 137 Cs (Stark et al, 2006). Available samples from this area were soil/sediment profiles down to a depth of 50 cm, water, vegetation, and amphibians (Stark et al, 2004;Stark unpublished data; Table 3).…”

Section: Utnora Swampmentioning

confidence: 99%

“…It is likely that 137 Cs in Utnora Swamp is attached to particles from the upstream lake and transported by the outlet stream that floods the swamp. This has resulted in 137 Cs deposits located mainly in the top 10-cm of soil layers (Stark et al, 2006), possibly making it less bioavailable for deeper plant roots.…”

Section: Measured Biota Activity Concentrationsmentioning

confidence: 99%

Predicting exposure of wildlife in radionuclide contaminated wetland ecosystems

Stark¹,

Andersson²,

Beresford³

et al. 2015

Environmental Pollution

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Many wetlands support high biodiversity and are protected sites, but some are contaminated with radionuclides from routine or accidental releases from nuclear facilities. This radiation exposure needs to be assessed to demonstrate radiological protection of the environment. Existing biota dose models cover generic terrestrial, freshwater, and marine ecosystems, not wetlands specifically. This paper, which was produced under IAEA's Environmental Modelling for Radiation Safety (EMRAS) II programme, describes an evaluation of how models can be applied to radionuclide contaminated wetlands. Participants used combinations of aquatic and terrestrial model parameters to assess exposure. Results show the importance of occupancy factor and food source (aquatic or terrestrial) included. The influence of soil saturation conditions on external dose rates is also apparent. In general, terrestrial parameters provided acceptable predictions for wetland organisms. However, occasionally predictions varied by three orders of magnitude between assessors. Possible further developments for biota dose models and research needs are identified.

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“…Correcting for decay to a common reference date, such as the date for the Chernobyl accident, would be misleading since site 5, because of a substantial redistribution of activity in the area, has accumulated more 137 Cs activity since then (Stark et al, 2006). Results for soil sample parameters are shown in Table 3.…”

Section: Soil Samplesmentioning

confidence: 99%

“…Site 5 is located next to the Verkmyra stream, close to its outlet into the Baltic Sea, and is annually flooded during snow melt in spring. Due to this flooding and the resulting deposition of sediments, the alder forest site has accumulated even more radioactivity (Stark et al, 2006), causing a significantly higher average ground deposition compared with site 4, located less than 1 km upstream the Verkmyra stream. Flooding is also the most likely explanation for the high spatial variability encountered in soil samples from site 5.…”

Section: Soil Samplesmentioning

confidence: 99%

Evaluation of Monte Carlo-based calibrations of HPGe detectors for in situ gamma-ray spectrometry

Boson¹,

Plamboeck²,

Ramebäck³

et al. 2009

Journal of Environmental Radioactivity

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Post-depositional redistribution and gradual accumulation of 137Cs in a riparian wetland ecosystem in Sweden

Cited by 18 publications

References 24 publications

Carbon Sequestration and Sedimentation in Mangrove Swamps Influenced by Hydrogeomorphic Conditions and Urbanization in Southwest Florida

Carbon Sequestration and Sedimentation in Mangrove Swamps Influenced by Hydrogeomorphic Conditions and Urbanization in Southwest Florida

Predicting exposure of wildlife in radionuclide contaminated wetland ecosystems

Evaluation of Monte Carlo-based calibrations of HPGe detectors for in situ gamma-ray spectrometry

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