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Catchment export of base cations: improved mineral dissolution kinetics influence the role of water transit time

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Erlandsson Lampa, Martin
dc.contributor.author Sverdrup, Harald Ulrik
dc.contributor.author Bishop, Kevin H.
dc.contributor.author Belyazid, Salim
dc.contributor.author Ameli, Ali
dc.contributor.author Köhler, Stephan J.
dc.date.accessioned 2020-12-22T15:17:19Z
dc.date.available 2020-12-22T15:17:19Z
dc.date.issued 2020-06-03
dc.identifier.citation Erlandsson Lampa, M., Sverdrup, H.U., Bishop, K.H., Belyazid, S., Ameli, A., Köhler, S.J., 2020. Catchment export of base cations: improved mineral dissolution kinetics influence the role of water transit time. SOIL 6, 231–244. doi:10.5194/soil-6-231-2020
dc.identifier.issn 2199-398X
dc.identifier.uri https://hdl.handle.net/20.500.11815/2325
dc.description Publisher's version (útgefin grein)
dc.description.abstract Soil mineral weathering is one of the major sources of base cations (BC), which play a dual role in forest ecosystems: they function as plant nutrients and buffer against the acidification of catchment runoff. On a long-term basis, soil weathering rates determine the highest sustainable forest productivity that does not cause acidification. It is believed that the hydrologic residence time plays a key role in determining the weathering rates at the landscape scale. The PROFILE weathering model has been used for almost 30 years to calculate weathering rates in the rooting zone of forest soils. However, the mineral dissolution equations in PROFILE are not adapted for the saturated zone, and employing these equations at the catchment scale results in a significant overprediction of base cation release rates to surface waters. In this study, we use a revised set of PROFILE equations which, among other features, include retardation due to silica concentrations. Relationships between the water transit time (WTT) and soil water concentrations were derived for each base cation, by simulating the soil water chemistry along a one-dimensional flow path, using the mineralogy from a glacial till soil. We show how the revised PROFILE equations are able to reproduce patterns in BC and silica concentrations as well as BC ratios (Ca2+/BC, Mg2+/BC and Na+/BC) that are observed in the soil water profiles and catchment runoff. In contrast to the original set of PROFILE equations, the revised set of equations could reproduce the fact that increasing WTT led to a decreasing Na+/BC ratio and increasing Ca2+/BC and Mg2+/BC ratios. Furthermore, the total release of base cations from a hillslope was calculated using a mixing model, where water with different WTTs was mixed according to an externally modeled WTT distribution. The revised set of equations gave a 50 % lower base cation release (0.23 eq m−2 yr−1) than the original PROFILE equations and are in better agreement with mass balance calculations of weathering rates. Thus, the results from this study demonstrate that the revised mineral dissolution equations for PROFILE are a major step forward in modeling weathering rates at the catchment scale.
dc.description.sponsorship This study was funded by the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS, reg. no. 212-2011-1691) within the ”Quantifying weathering rates for sustainable forestry (QWARTS)” strong research environment.
dc.format.extent 231-244
dc.language.iso en
dc.publisher Copernicus GmbH
dc.relation.ispartofseries SOIL;6(1)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Soil mineral weathering
dc.subject Ecosystem
dc.subject Forest
dc.subject Jarðvegur
dc.subject Steinefni
dc.subject Skógar
dc.title Catchment export of base cations: improved mineral dissolution kinetics influence the role of water transit time
dc.type info:eu-repo/semantics/article
dcterms.license This work is distributed underthe Creative Commons Attribution 4.0 License.
dc.description.version Peer Reviewed
dc.identifier.journal Soil
dc.identifier.doi 10.5194/soil-6-231-2020
dc.relation.url https://soil.copernicus.org/articles/6/231/2020/soil-6-231-2020.pdf
dc.contributor.department Iðnaðarverkfræði-, vélaverkfræði- og tölvunarfræðideild (HÍ)
dc.contributor.department Faculty of Industrial Eng., Mechanical Eng. and Computer Science (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

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