Contributions of Oi, Oe and Oa horizons to dissolved organic matter in forest floor leachates

Fröberg, Mats; Berggren, Dan; Bergkvist, Bo; Bryant, Charlotte; Knicker, Heike

doi:10.1016/s0016-7061(02)00367-1

Cited by 87 publications

(63 citation statements)

References 24 publications

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“…In contrast, Fröberg et al (2003) reported differing intensities for DOM in TF from a 35-year-old Norway spruce stand in southern Sweden, with lower carbonyl C and aryl C but higher O-alkyl C contents, even resulting in a lower A / O-A ratio (0.42) and aromaticity index (12.24 %). To our knowledge, there are no comparable studies of beech-derived TF samples or of SF samples in general.…”

Section: Throughfallmentioning

confidence: 89%

“…Here, the two fractions of FF leachate revealed only minor differences in C composition and A / O-A ratio. Again, no corresponding data for beech stands were available in the literature, but for a spruce forest site in southern Sweden, Fröberg et al (2003) reported similar signal intensities from solid-state 13 C NMR spectra of Oa layer solutions. In contrast, 13 C NMR data for FF leachates of a Californian mixed Redwood stand reported by Sanderman et al (2008) exhibited lower intensities for alkyl C and remarkably higher intensities for the aromatic C region, resulting in an approximately halved A / O-A ratio compared with our spruce sites.…”

Section: Forest Floor Leachatesmentioning

confidence: 97%

“…Consequently, solid-state 13 C NMR spectroscopy is widely used for the characterization of a range of organic materials from various natural environments (Baldock et al, 2004). It has been applied to soil OM (Helfrich et al, 2006;Keeler et al, 2006), hot water extracts (Leinweber et al, 1995;Balaria et al, 2009) and DOM in aqueous solutions from aquatic (Schumacher et al, 2006) and terrestrial ecosystems Fröberg et al, 2003;Sanderman et al, 2008). Although the technique has been applied to POM from aquatic systems (McKnight et al, 1997;Lankes et al, 2008), to the best of our knowledge, it has never been applied to POM or TOM in aqueous samples from terrestrial ecosystems such as TF, SF or FF leachates.…”

Section: Introductionmentioning

confidence: 99%

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Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

et al. 2015

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Abstract. We present the first investigation of the composition of dissolved organic matter (DOM) compared to total organic matter (TOM, consisting of DOM, < 0.45 µm and particulate organic matter 0.45 µm < POM < 500 µm) in throughfall, stemflow and forest floor leachate of common beech (Fagus sylvatica L.) and Norway spruce (Picea abies (L.) H. Karst.) forests using solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy. We hypothesized that the composition and properties of organic matter (OM) in forest ecosystem water samples differ between DOM and TOM and between the two tree species.The 13 C NMR results, derived from 21 samples, point to pronounced differences in the composition of DOM and TOM in throughfall solution at the beech sites, with TOM exhibiting higher relative intensities for the alkyl C region, which represents aliphatic C from less decomposed organic material compared to DOM. Furthermore, TOM shows lower intensities for lignin-derived and aromatic C of the aryl C region resulting in lower aromaticity indices and a diminished degree of humification. Across the ecosystem compartments, differences in the structural composition of DOM and TOM under beech lessened in the following order: throughfall > stemflow ≈ forest floor leachate.In contrast to the broadleaved sites, differences between DOM and TOM in throughfall solution under spruce were less pronounced and spectra were, overall, dominated by the alkyl C region, representing aliphatic C. Explanations of the reported results might be substantiated in differences in tree species-specific structural effects, leaching characteristics or differences in the microbial community of the tree species' phyllosphere and cortisphere. However, the fact that throughfall DOM under beech showed the highest intensities of recalcitrant aromatic and phenolic C among all samples analysed likely points to a high allelopathic potential of beech trees negatively affecting other organisms and hence ecosystem processes and functions.

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Section: Throughfallmentioning

confidence: 89%

Section: Forest Floor Leachatesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

et al. 2015

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“…In this work we studied three fractions of dissolved organic matter isolated from a forest floor soil solution sampled at the Asa experimental site, which has previously been well described and is currently being used for DOC leaching and metal-binding experiments (Fröberg et al, 2003;Fröberg et al, 2005;Gustafsson et al, 2007). In addition to the most commonly studied fraction (fulvic acids/hydrophobic acids), we investigated two hydrophilic fractions from the same soil solution.…”

Section: Metals In Natural Waters Generally Exist In Different Physicmentioning

confidence: 99%

“…We also tested the ability of two geochemical models to describe the experimental data, both with and without parameter optimisation. horizon solution from this site has previously been characterised in detail (Fröberg et al, 2003). …”

Section: Metals In Natural Waters Generally Exist In Different Physicmentioning

confidence: 99%

Acid–base and copper-binding properties of three organic matter fractions isolated from a forest floor soil solution

Schaik

Kleja

Gustafsson

2010

Geochimica et Cosmochimica Acta

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ABSTRACT.Vast amounts of knowledge about the proton-and metal-binding properties of dissolved organic matter (DOM) in natural waters have been obtained in studies on isolated humic and fulvic (hydrophobic) acids. Although macromolecular hydrophilic acids normally make up about one-third of DOM, their proton-and metal-binding properties are poorly known. Here we investigated the acid-base and Cu-binding properties of the hydrophobic (fulvic) acid fraction and two hydrophilic fractions isolated from a soil solution. Proton titrations revealed a higher total charge for the hydrophilic acid fractions than for the hydrophobic acid fraction. The most hydrophilic fraction appeared to be dominated by weak acid sites, as evidenced by increased slope of the curve of surface charge versus pH at pH values above 6. The titration curves were poorly predicted by both Stockholm Humic Model (SHM) and NICA-Donnan model calculations using generic parameter values, but could be modelled accurately after optimisation of the proton-binding parameters (pH ≤ 9). Cu-binding isotherms for the three fractions were determined at pH values of 4, 6 and 9. With the optimised proton-binding parameters, the SHM model predictions for Cu binding improved, whereas the NICA-Donnan predictions deteriorated. After optimisation of Cu-binding parameters, both models described the experimental data satisfactorily. Iron(III) and aluminium competed strongly with Cu for binding sites at both pH 4 and pH 6. The SHM model predicted this competition reasonably well, but the NICA-Donnan model underestimated the effects significantly at pH 6. Overall, the Cu-binding behaviour of the two hydrophilic acid fractions was very similar to that of the hydrophobic acid fraction, despite the differences observed in 3 proton-binding characteristics. These results show that for modelling purposes, it is essential to include the hydrophilic acid fraction in the pool of 'active' humic substances.

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Antecedent moisture conditions control mercury and dissolved organic carbon concentration dynamics in a boreal headwater catchment

Oswald

Branfireun

2014

Water Resources Research

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The fate and transport of mercury (Hg) deposited on forested upland soils depends on the biogeochemical and hydrological processes occurring in the soil landscape. In this study, total Hg (THg) and dissolved organic carbon (DOC) concentrations were measured in streamwater from a 7.75 ha upland subcatchment of the METAALICUS watershed in northwestern Ontario, Canada. THg and DOC concentration-discharge relationships were examined at the seasonal-scale and event-scale to assess the role of antecedent moisture conditions on the mobilization of these solutes to receiving waters. At the seasonal-scale, subcatchment discharge poorly explained THg and DOC concentration dynamics; however, the inclusion of antecedent water storage and precipitation metrics in a multiple regression model improved the prediction of THg and DOC concentrations significantly. At the event-scale, a comparison of THg and DOC concentrations for two small summer storms with similar total discharge showed that the storm following the wet snowmelt period had a significantly lower total flux of THg and DOC than the storm following warm and dry conditions in late summer due to a distinct shift in the concentration-discharge relationship. Measurements of soil water and groundwater THg and DOC concentrations, as well as a three-component mixing analysis, suggest that there was an accumulation of potentially-mobile DOC-bound THg in the wellhumified organic soil layer in the catchment during the warm and dry summer period and that as the catchment became wetter in the autumn, there was an increase in soil water THg and DOC concentrations and these solutes were subsequently flushed during the autumn storm.

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Contributions of Oi, Oe and Oa horizons to dissolved organic matter in forest floor leachates

Abstract: El artículo seleccionado no se encuentra disponible por ahora a texto completo por no haber sido facilitado todavía por el investigador a cargo del archivo del mismo.

Cited by 87 publications

References 24 publications

Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

Properties of dissolved and total organic matter in throughfall, stemflow and forest floor leachate of central European forests

Acid–base and copper-binding properties of three organic matter fractions isolated from a forest floor soil solution

Antecedent moisture conditions control mercury and dissolved organic carbon concentration dynamics in a boreal headwater catchment

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