Riparian zone control on base cation concentration in boreal streams

Ledesma, José L. J.; Grabs, Thomas; Bishop, Kevin; Bishop, Kevin; Laudon, Hjalmar; Köhler, Stephan Jürgen

doi:10.5194/bg-10-3849-2013

Cited by 57 publications

(60 citation statements)

References 75 publications

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“…The mineralogy is dominated by quartz (40 %), K-feldspar (25 %), plagioclase (23 %), amphibolites (7 %), muscovite (4 %) and chlorite (1 %; Ledesma et al, 2013). At ca.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Fiebig et al, 1990;Hinton et al, 1998;Oquist et al, 2009;Lyon et al, 2011;Winterdahl et al, 2011;Grabs et al, 2012;Knorr, 2013;Leith, 2015;Ledesma et al, 2015). However, the special biogeochemical conditions of the riparian zone also have consequences for the transport of widely different substances such as nitrogen (Hill, 1996;Cirmo and McDonnell, 1997;Sabater et al, 2003), phosphorus (Mulholland, 1992), base cations (Ledesma et al, 2013), aluminium (Cory et al, 2007), mercury , persistent organic pollutants (Bergknut et al, 2011) and pesticides (Vidon et al, 2010). Furthermore, the riparian zone is gaining increasing recognition as an ecological hotspot (Jansson et al, 2007;Kuglerová et al, 2013;Nilsson et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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From soil water to surface water – how the riparian zone controls element transport from a boreal forest to a stream

et al. 2017

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Abstract. Boreal headwaters are often lined by strips of highly organic soils, which are the last terrestrial environment to leave an imprint on discharging groundwater before it enters a stream. Because these riparian soils are so different from the Podzol soils that dominate much of the boreal landscape, they are known to have a major impact on the biogeochemistry of important elements such as C, N, P and Fe and the transfer of these elements from terrestrial to aquatic ecosystems. For most elements, however, the role of the riparian zone has remained unclear, although it should be expected that the mobility of many elements is affected by changes in, for example, pH, redox potential and concentration of organic carbon as they are transported through the riparian zone. Therefore, soil water and groundwater was sampled at different depths along a 22 m hillslope transect in the Krycklan catchment in northern Sweden using soil lysimeters and analysed for a large number of major and trace elements (Al, As, B, Ba, Ca, Cd, Cl, Co, Cr, Cs, Cu, Fe, K, La, Li, Mg, Mn, Na, Ni, Pb, Rb, Se, Si, Sr, Th, Ti, U, V, Zn, Zr) and other parameters such as sulfate and total organic carbon (TOC). The results showed that the concentrations of most investigated elements increased substantially (up to 60 times) as the water flowed from the uphill mineral soils and into the riparian zone, largely as a result of higher TOC concentrations. The stream water concentrations of these elements were typically somewhat lower than in the riparian zone, but still considerably higher than in the uphill mineral soils, which suggests that riparian soils have a decisive impact on the water quality of boreal streams. The degree of enrichment in the riparian zone for different elements could be linked to the affinity for organic matter, indicating that the pattern with strongly elevated concentrations in riparian soils is typical for organophilic substances. One likely explanation is that the solubility of many organophilic elements increases as a result of the higher concentrations of TOC in the riparian zone. Elements with low or modest affinity for organic matter (e.g. Na, Cl, K, Mg and Ca) occurred in similar or lower concentrations in the riparian zone. Despite the elevated concentrations of many elements in riparian soil water and groundwater, no increase in the concentrations in biota could be observed (bilberry leaves and spruce shoots).

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“…The mineralogy is dominated by quartz (40 %), K-feldspar (25 %), plagioclase (23 %), amphibolites (7 %), muscovite (4 %) and chlorite (1 %; Ledesma et al, 2013). At ca.…”

Section: Site Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

From soil water to surface water – how the riparian zone controls element transport from a boreal forest to a stream

et al. 2017

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“…2). A recent study by Ledesma et al (2013) has shown that the concept works well for other aspects of stream chemistry such as base cations. The model is driven by flow, stream chemistry, and soil temperature data.…”

Section: Dynamic Riparian Flow-concentration Integration Modelmentioning

confidence: 99%

“…The simple dynamic riparian flow-concentration integration model (RIM) is a hillslope scale model of riparian controls on stream [DOC] in forest catchments ). The concept behind the RIM development was based on the assumption that the riparian zone closest to the stream is a first-order factor controlling stream DOC (Winterdahl et al 2011a, b) and other streamwater chemistry in forest landscapes (Ledesma et al 2013). The RIM conceptualization was justified by the fact that the riparian zone is a biogeochemical hotspot where organic-rich soil consistently interacts with ground and surface waters (Grabs et al 2012) and thus riparian soil water [DOC] and flow paths effectively control stream [DOC].…”

Section: Introductionmentioning

confidence: 99%

Cross-scale ensemble projections of dissolved organic carbon dynamics in boreal forest streams

et al. 2014

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Climate is an important driver of dissolved organic carbon (DOC) dynamics in boreal catchments characterized by networks of streams within forest-wetland landscape mosaics. In this paper, we assess how climate change may affect stream DOC concentrations ([DOC]) and export from boreal forest streams with a multi-model ensemble approach. First, we apply an ensemble of regional climate models (RCMs) to project soil temperatures and stream-flows. These data are then used to drive two biogeochemical models of surface water DOC: (1) The Integrated Catchment model for Carbon (INCA-C), a detailed process-based model of DOC operating at the catchment scale, and (2) The Riparian Integration Model (RIM), a simple dynamic hillslope scale model of stream [DOC]. All RCMs project a consistent increase in temperature and precipitation as well as a shift in spring runoff peaks from May to April. However, they present a considerable range of possible future runoff conditions with an ensemble median increase of 31 % between current and future (2061-2090) conditions. Both biogeochemical models perform well in describing the dynamics of presentday stream [DOC] and fluxes, but disagree in their future projections. Here, we assess possible futures in three boreal catchments representative of forest, mire and mixed landscape elements. INCA-C projects a wider range of stream [DOC] due to its temperature sensitivity, whereas RIM gives consistently larger inter-annual variation and a wider range of exports due to its sensitivity to hydrological variations. The uncertainties associated with modeling complex processes that control future DOC dynamics in boreal and temperate catchments are still the main limitation to our understanding of DOC mechanisms under changing climate conditions. Novel, currently overlooked or unknown drivers may appear that will present new challenges to modelling DOC in the future.

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“…(i) Stream water partly derives from wet peaty soils along the stream. Organic matter from the peaty zones may control the stream water base cation chemistry (Ledesma et al, 2013). These wet peaty soils could act as a cation exchanger that preferentially retains the heavy Mg isotope.…”

Section: Discussionmentioning

confidence: 99%

Magnesium Isotope Variations to Trace Liming Input to Terrestrial Ecosystems: A Case Study in the Vosges Mountains

Bolou‐Bi¹,

Dambrine

Angéli

et al. 2016

J. Environ. Qual.

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Liming with Ca and Mg carbonates is commonly used to reduce soil and stream acidity and to improve vegetation growth and nutrition in forests. Ten years ago, dolomite lime was experimentally applied to a forest catchment on granite in the Vosges Mountains (northeast France), which is characterized by acid soils and drained by an acid stream. The average Mg isotope composition of the dolomite lime (-1.75‰) was low compared with that of tree foliage (-0.70‰), granite and deep soil layers (-0.40‰), and stream water (-0.80‰) in the control catchment. After liming, the exchangeable Mg concentrations in surface soil layers, which were initially very low, increased, and the Mg isotope composition decreased (up to -0.60‰). The decrease was smaller in deeper layers but not in proportion to the increase in exchangeable Mg content, suggesting contributions from mineralization of organic matter and/or displacement of exchangeable Mg from surface layers. Before application, Mg concentration in beech and fir leaves was low, and that of 1-yr-old fir needles was lower than that in current needles. Internal Mg translocation within fir needles also resulted in a lower δMg of older needles. Three years after dolomite application, the Mg isotope composition of plant leaves was lower than that in the control catchment; this decrease (up to -1.00‰) was attributed to direct uptake of Mg from dissolving dolomite. Liming doubled the concentration of Mg in the stream, whereas the Mg isotope composition decreased correspondingly from -0.80 to -1.20‰, indicating a fast transfer of dolomite Mg to the stream. Our findings indicate that monitoring of δMg may be a promising tool to study the fate of dolomitic inputs in terrestrial and aquatic ecosystems.

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Riparian zone control on base cation concentration in boreal streams

Cited by 57 publications

References 75 publications

From soil water to surface water – how the riparian zone controls element transport from a boreal forest to a stream

From soil water to surface water – how the riparian zone controls element transport from a boreal forest to a stream

Cross-scale ensemble projections of dissolved organic carbon dynamics in boreal forest streams

Magnesium Isotope Variations to Trace Liming Input to Terrestrial Ecosystems: A Case Study in the Vosges Mountains

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