Changes in dissolved organic carbon quality in soils and discharge 10years after peatland restoration

Strack, Maria; Zuback, Y. C. A.; McCarter, Colin P.R.; Price, Jonathan S.

doi:10.1016/j.jhydrol.2015.04.061

Cited by 40 publications

(53 citation statements)

References 45 publications

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“…In addition, the difference in [DOC] dynamics is also reflected in DOM quality inferred from its fluorescence properties, with a greater increase in low molecular weight compounds (component M) and fewer aromatic high molecular 5 weight compounds (component C) in the rewetted location during the dry season compared to the control area. These findings are in agreement with the studies by Höll et al (2009), Hribljan et al (2014 and Strack et al (2015) who observed that wetter sites would result in a pore water with smaller and fewer aromatic dissolved organic molecules (likely sourced from inputs of fresh litter from growing vegetation) than the sites with a lower water table.…”

Section: Doc Concentrations and Control Factorssupporting

confidence: 93%

“…DOC dynamics in peatlands has been found to be strongly controlled by site hydrology, especially by the water table 5 depth (WTD) (e.g. Hribljan et al, 2014;Jager et al, 2009;Strack et al, 2008Strack et al, , 2015. Therefore, hydrological disturbances such as drainage can lead to increased DOC exports in relation with WTD variations (Strack et al, 2008;Worrall et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, hydrological disturbances such as drainage can lead to increased DOC exports in relation with WTD variations (Strack et al, 2008;Worrall et al, 2007). Where disturbances have occurred, hydrological restoration can be undertaken to reestablish peatland functioning (Menberu et al, 2016), with a potential impact on DOC dynamics and exports (Glatzel et al, 2003;Strack et al, 2015;Worrall et al, 2007). 10 In peatlands, as in many terrestrial ecosystems, DOC dynamics is controlled on the one hand, by its production to consumption ratio in pore water, and, on the other hand, by lateral water fluxes that drive its exports.…”

Section: Introductionmentioning

confidence: 99%

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Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>–dominated peatland: a water-table based modelling approach

Bernard-Jannin¹,

Binet²,

Gogo³

et al. 2017

Preprint

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Hydrological disturbances could increase dissolved organic carbon (DOC) exports through runoff and leaching, reducing the potential carbon sink function of peatlands. The objective of this study was to assess the impact of hydrological restoration 15 on hydrological processes and DOC dynamics in a rehabilitated Sphagnum-dominated peatland. A conceptual hydrological model calibrated on the water table and coupled with a biogeochemical module was applied to La Guette peatland (France), which experienced a rewetting action on February 2014. The model (ten calibrated parameters) reproduced water table and pore water DOC concentration time series (01/04/2014 to 15/07/2017) in two contrasted locations (rewetted and control) of the peatland. Hydrological restoration was found to impact the water balance through a decrease in slow deep drainage and 20 an increase in fast superficial runoff. Observed DOC concentrations were higher in summer in the rewetted location compared to the control and were linked with a difference in dissolved organic matter composition analyzed by fluorescence.Hydrological conditions, especially the severity of the water table drawdown, were identified as the major factors controlling DOC concentration dynamics. The results of the simulation suggest that the hydrological restoration did not affect DOC loads, at least on a short-term period (3 years). However, it impacted the temporal dynamics of DOC exports, which were the 25 most episodic and mainly transported through fast surface runoff in the area affected by the restoration while slow deep drainage dominated DOC exports in the control area. In relation with dominant hydrological processes, exported DOC is expected to be derived from more recent organic matter of the top peat layer in the rewetted area than in the control area.Since it is calibrated on water table and DOC concentration, the model presented in this study proved to be a relevant tool to identify the main hydrological processes and factors controlling DOC dynamics in different areas of the same peatland. It is 30 also a suitable alternative to a discharge calibrated catchment model when the outlet is not easily identifiable.Hydrol. Earth Syst. Sci. Discuss., https://doi

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Section: Doc Concentrations and Control Factorssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>–dominated peatland: a water-table based modelling approach

Bernard-Jannin¹,

Binet²,

Gogo³

et al. 2017

Preprint

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“…En el horizonte 4Bs, por el contrario, los altos valores obtenidos para estos mismos parámetros son propios de ácidos fúlvicos y se asocian con un bajo grado de humificación en la fracción orgánica acumulada en el suelo a esta profundidad, probablemente relacionado con unas condiciones ambientales menos húmedas que las dominantes cuando se estaba desarrollando el suelo suprayacente, así también lo indica Strack et al (2015).…”

Section: Extracción Con Hidróxido De Sodiounclassified

Caracterización óptica de la materia orgánica de un Andisol del Oriente antioqueño, Colombia

et al. 2018

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Recibido 11-10-2017Recibido 11-10- , aceptado 21-11-2017Recibido 11-10- , versión final 24-11-2017. Artículo Investigación RESUMEN: Se realizó la caracterización óptica de la materia orgánica (MO) de un Andisol, obtenida en extracciones selectivas y secuenciales de Al, Fe y Si (cloruro de potasio, pirofosfato de sodio, oxalato ácido de amonio, ditionitocitrato-bicarbonato e hidróxido de sodio). A partir de las absorbancias se calculó la relación E4/E6, el ∆ log K, el índice melánico (IM) y la densidad óptica del extracto de oxalato (ODOE). Los resultados de la relación E4/E6, del ∆ log K y del IM en los extractos obtenidos con pirofosfato de sodio y con oxalato ácido de amonio mostraron un mayor grado de humificación para la materia orgánica extraída de los horizontes A y 2B/A y uno menor para la extraída de los horizontes 3C/A y 4Bs. El ODOE mostró la presencia de complejos orgánicos en los extractos obtenidos con pirofosfato de sodio e hidróxido de sodio y, la acumulación iluvial de óxidos e hidróxidos de Fe no cristalinos en el horizonte 4Bs en el extracto obtenido con oxalato ácido de amonio. En el horizonte A, los índices de humificación marcaron un cambio en el grado de evolución de la MO entre 8 y 10 cm de profundidad, lo cual podría indicar la presencia de una discontinuidad litológica o de un suelo enterrado.PALABRAS CLAVE: Complejos orgánicos; evolución; extracciones selectivas de Al, Fe y Si; índices de humificación.ABSTRACT: The optical characterization of the organic matter (OM) of an Andisol obtained from selective and sequential extractions of Al, Fe and Si (potassium chloride, sodium pyrophosphate, ammonium acid oxalate, dithionitecitrate-bicarbonate and sodium hydroxide) was made. The E4/E6 ratio, the ∆ log K, the melanic index (MI) and the optical density of oxalate extract (ODOE) were calculated from the absorbances. The results of the E4/E6 ratio, the ∆ log K and the MI in the extracts obtained with sodium pyrophosphate and with ammonium acid oxalate showed a higher degree of humification for the organic matter extracted from the A and 2B/A horizons and one smaller for the one extracted from the 3C/A and 4Bs horizons. The ODOE showed the presence of organic complexes in the extracts obtained with sodium pyrophosphate and with sodium hydroxide and the iluvial accumulation of non-crystalline Fe oxides and hydroxides in the 4Bs horizon in the extract obtained with ammonium acid oxalate. In the horizon A, the humification indexes marked a change in the degree of evolution of the MO between 8 and 10 cm of depth, which could indicate the presence of a lithological discontinuity or of buried soil.KEYWORDS: Organic complexes; evolution; selective extractions of Al, Fe and Si; humification indexes. INTRODUCCIÓNEn este trabajo se realizó la caracterización óptica de la MO extraída secuencialmente de un Andisol con cloruro de potasio, pirofosfato de sodio, oxalato ácido de amonio, ditionito-citrato-bicarbonato e hidróxido de sodio. Para esto se utilizaron los valores de la relación E4/E6, del ∆ log K, ...

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“…Traditionally, DOC flux measurements, particularly in peatlands, are based on occasional (e.g. weekly) grab sampling of river water (Strack et al, 2015;Tipping et al, 2010). However, this can be highly problematic.…”

Section: Introductionmentioning

confidence: 99%

Improved automation of dissolved organic carbon sampling for organic-rich surface waters

Grayson

Holden

2016

Science of The Total Environment

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In-situ UV-Vis spectrophotometers offer the potential for improved estimates of dissolved organic carbon (DOC) fluxes for organic-rich systems such as peatlands because they are able to sample and log DOC proxies automatically through time at low cost. In turn, this could enable improved total carbon budget estimates for peatlands. The ability of such instruments to accurately measure DOC depends on a number of factors, not least of which is how absorbance measurements relate to DOC and the environmental conditions. Here we test the ability of a S::can Spectro::lyser TM for measuring DOC in peatland streams with routinely high DOC concentrations. Through analysis of the spectral response data collected by the instrument we have been able to accurately measure DOC up to 66 mg L -1 , which is more than double the original upper calibration limit for this particular instrument. A linear regression modelling approach resulted in an accuracy > 95%. The greatest accuracy was achieved when absorbance values for several different wavelengths were used at the same time in the model. However, an accuracy > 90% was achieved using absorbance values for a single wavelength to predict DOC concentration. Our calculations indicated that, for organicrich systems, in-situ measurement with a scanning spectrophotometer can improve fluvial DOC flux estimates by 6 to 8% compared with traditional sampling methods. Thus, our techniques pave the way for improved long-term carbon budget calculations from organicrich systems such as peatlands.

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Changes in dissolved organic carbon quality in soils and discharge 10years after peatland restoration

Cited by 40 publications

References 45 publications

Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>–dominated peatland: a water-table based modelling approach

Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>–dominated peatland: a water-table based modelling approach

Caracterización óptica de la materia orgánica de un Andisol del Oriente antioqueño, Colombia

Improved automation of dissolved organic carbon sampling for organic-rich surface waters

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Changes in dissolved organic carbon quality in soils and discharge 10years after peatland restoration

Cited by 40 publications

References 45 publications

Hydrological control of dissolved organic carbon dynamics in a rehabilitated &lt;i&gt;Sphagnum&lt;/i&gt;–dominated peatland: a water-table based modelling approach

Hydrological control of dissolved organic carbon dynamics in a rehabilitated &lt;i&gt;Sphagnum&lt;/i&gt;–dominated peatland: a water-table based modelling approach

Caracterización óptica de la materia orgánica de un Andisol del Oriente antioqueño, Colombia

Improved automation of dissolved organic carbon sampling for organic-rich surface waters

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Product

Resources

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Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>–dominated peatland: a water-table based modelling approach

Hydrological control of dissolved organic carbon dynamics in a rehabilitated <i>Sphagnum</i>–dominated peatland: a water-table based modelling approach