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Carbon mineralizati...
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Klaminder, JonatanUmeå universitet,Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Umeå University,Institutionen för ekologi, miljö och geovetenskap,Department of Forest Ecology and Management, SLU, SE-901 83 Umeå, Sweden ; Arcum
(författare)
Carbon mineralization and pyrite oxidation in groundwater : Importance for silicate weathering in boreal forest soils and stream base-flow chemistry
- Artikel/kapitelEngelska2011
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Elsevier BV,2011
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LIBRIS-ID:oai:DiVA.org:su-67917
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-67917URI
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https://doi.org/10.1016/j.apgeochem.2010.12.005DOI
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https://res.slu.se/id/publ/57262URI
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-40051URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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authorCount :4
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What role does mineralized organic C and sulfide oxidation play in weathering of silicate minerals in deep groundwater aquifers? In this study, how H(2)CO(3), produced as a result of mineralization of organic matter during groundwater transport, affects silicate weathering in the saturated zone of the mineral soil along a 70 m-long boreal hillslope is demonstrated. Stream water measurements of base cations and delta(18)O are included to determine the importance of the deep groundwater system for downstream surface water. The results suggest that H2CO3 generated from organic compounds being mineralized during the lateral transport stimulates weathering at depths between 0.5 and 3 m in the soil. This finding is indicated by progressively increasing concentrations of base cations-, silica- and inorganic C (IC) in the groundwater along the hillslope that co-occur with decreasing organic C (OC) concentrations. Protons derived from sulfide oxidation appear to be an additional driver of the weathering process as indicated by a buildup of SO(4)(2-) in the groundwater during lateral transport and a delta(34)S parts per thousand value of +0.26-3.76 parts per thousand in the deep groundwater indicating S inputs from pyrite. The two identified active acids in the deep groundwater are likely to control the base-flow chemistry of streams draining larger catchments (>1 km(2)) as evident by delta(18)O signatures and base cation concentrations that overlap with that of the groundwater.
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Grip, HaraldSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Department of Forest Ecology and Management, SLU, SE-901 83 Umeå, Sweden(Swepub:slu)48542
(författare)
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Mörth, Carl-MagnusStockholms universitet,Institutionen för geologiska vetenskaper,Department of Geological Sciences, Stockholm University, 106 91 Stockholm, Sweden(Swepub:su)morth
(författare)
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Laudon, HjalmarSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Department of Forest Ecology and Management, SLU, SE-901 83 Umeå, Sweden(Swepub:slu)48717
(författare)
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Sveriges lantbruksuniversitetInstitutionen för skogens ekologi och skötsel
(creator_code:org_t)
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Sveriges lantbruksuniversitet
Sammanhörande titlar
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Ingår i:Applied Geochemistry: Elsevier BV26:3, s. 319-3240883-29271872-9134
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