Mercury in the soil of two contrasting watersheds in the eastern United States.

Soil represents the largest store of mercury (Hg) in terrestrial ecosystems, and further study of the factors associated with soil Hg storage is needed to address concerns about the magnitude and persistence of global environmental Hg bioaccumulation. To address this need, we compared total Hg and m...

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Autores principales:	Douglas A Burns, Laurel G Woodruff, Paul M Bradley, William F Cannon
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/622f215da5254be695dded38cc0b2984
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spelling	oai:doaj.org-article:622f215da5254be695dded38cc0b29842021-11-18T08:32:31ZMercury in the soil of two contrasting watersheds in the eastern United States.1932-620310.1371/journal.pone.0086855https://doaj.org/article/622f215da5254be695dded38cc0b29842014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24551042/?tool=EBIhttps://doaj.org/toc/1932-6203Soil represents the largest store of mercury (Hg) in terrestrial ecosystems, and further study of the factors associated with soil Hg storage is needed to address concerns about the magnitude and persistence of global environmental Hg bioaccumulation. To address this need, we compared total Hg and methyl Hg concentrations and stores in the soil of different landscapes in two watersheds in different geographic settings with similar and relatively high methyl Hg concentrations in surface waters and biota, Fishing Brook, Adirondack Mountains, New York, and McTier Creek, Coastal Plain, South Carolina. Median total Hg concentrations and stores in organic and mineral soil samples were three-fold greater at Fishing Brook than at McTier Creek. Similarly, median methyl Hg concentrations were about two-fold greater in Fishing Brook soil than in McTier Creek soil, but this difference was significant only for mineral soil samples, and methyl Hg stores were not significantly different among these watersheds. In contrast, the methyl Hg/total Hg ratio was significantly greater at McTier Creek suggesting greater climate-driven methylation efficiency in the Coastal Plain soil than that of the Adirondack Mountains. The Adirondack soil had eight-fold greater soil organic matter than that of the Coastal Plain, consistent with greater total Hg stores in the northern soil, but soil organic matter - total Hg relations differed among the sites. A strong linear relation was evident at McTier Creek (r(2) = 0.68; p<0.001), but a linear relation at Fishing Brook was weak (r(2) = 0.13; p<0.001) and highly variable across the soil organic matter content range, suggesting excess Hg binding capacity in the Adirondack soil. These results suggest greater total Hg turnover time in Adirondack soil than that of the Coastal Plain, and that future declines in stream water Hg concentrations driven by declines in atmospheric Hg deposition will be more gradual and prolonged in the Adirondacks.Douglas A BurnsLaurel G WoodruffPaul M BradleyWilliam F CannonPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 2, p e86855 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Douglas A Burns Laurel G Woodruff Paul M Bradley William F Cannon Mercury in the soil of two contrasting watersheds in the eastern United States.
description	Soil represents the largest store of mercury (Hg) in terrestrial ecosystems, and further study of the factors associated with soil Hg storage is needed to address concerns about the magnitude and persistence of global environmental Hg bioaccumulation. To address this need, we compared total Hg and methyl Hg concentrations and stores in the soil of different landscapes in two watersheds in different geographic settings with similar and relatively high methyl Hg concentrations in surface waters and biota, Fishing Brook, Adirondack Mountains, New York, and McTier Creek, Coastal Plain, South Carolina. Median total Hg concentrations and stores in organic and mineral soil samples were three-fold greater at Fishing Brook than at McTier Creek. Similarly, median methyl Hg concentrations were about two-fold greater in Fishing Brook soil than in McTier Creek soil, but this difference was significant only for mineral soil samples, and methyl Hg stores were not significantly different among these watersheds. In contrast, the methyl Hg/total Hg ratio was significantly greater at McTier Creek suggesting greater climate-driven methylation efficiency in the Coastal Plain soil than that of the Adirondack Mountains. The Adirondack soil had eight-fold greater soil organic matter than that of the Coastal Plain, consistent with greater total Hg stores in the northern soil, but soil organic matter - total Hg relations differed among the sites. A strong linear relation was evident at McTier Creek (r(2) = 0.68; p<0.001), but a linear relation at Fishing Brook was weak (r(2) = 0.13; p<0.001) and highly variable across the soil organic matter content range, suggesting excess Hg binding capacity in the Adirondack soil. These results suggest greater total Hg turnover time in Adirondack soil than that of the Coastal Plain, and that future declines in stream water Hg concentrations driven by declines in atmospheric Hg deposition will be more gradual and prolonged in the Adirondacks.
format	article
author	Douglas A Burns Laurel G Woodruff Paul M Bradley William F Cannon
author_facet	Douglas A Burns Laurel G Woodruff Paul M Bradley William F Cannon
author_sort	Douglas A Burns
title	Mercury in the soil of two contrasting watersheds in the eastern United States.
title_short	Mercury in the soil of two contrasting watersheds in the eastern United States.
title_full	Mercury in the soil of two contrasting watersheds in the eastern United States.
title_fullStr	Mercury in the soil of two contrasting watersheds in the eastern United States.
title_full_unstemmed	Mercury in the soil of two contrasting watersheds in the eastern United States.
title_sort	mercury in the soil of two contrasting watersheds in the eastern united states.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/622f215da5254be695dded38cc0b2984
work_keys_str_mv	AT douglasaburns mercuryinthesoiloftwocontrastingwatershedsintheeasternunitedstates AT laurelgwoodruff mercuryinthesoiloftwocontrastingwatershedsintheeasternunitedstates AT paulmbradley mercuryinthesoiloftwocontrastingwatershedsintheeasternunitedstates AT williamfcannon mercuryinthesoiloftwocontrastingwatershedsintheeasternunitedstates
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Mercury in the soil of two contrasting watersheds in the eastern United States.

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