Characteristics of dissolved organic matter following 20years of peatland restoration

Höll, Bettina S.; Fiedler, Sabine; Jungkunst, Hermann F.; Kalbitz, Karsten; Freibauer, Annette; Drösler, Matthias; Stahr, Karl

doi:10.1016/j.scitotenv.2009.08.046

Cited by 83 publications

(78 citation statements)

References 35 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%

“…Long-term studies have reported decreasing pore water [DOC] more than 10 years after a restoration operation took place (Höll et al, 2009;Wallage et al, 2006), while others observed increasing [DOC] after restoration (Hribljan et al, 2014;30 Strack et al, 2015). Glatzel et al (2003) predicted a decrease in [DOC] with time due to a depletion of easily decomposable organic matter in the peat.…”

Section: Doc Concentrations and Control Factorsmentioning

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: Doc Concentrations and Control Factorsmentioning

confidence: 99%

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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“…In parallel, severe natural droughts followed by natural rewetting could destabilize C stocks causing DOC losses to downstream waters (Fenner and Freeman 2011). In contrast, decreased DOC concentration in soil water perhaps due to increased flushing of DOC from upper peat layers in short term (Wallage et al 2006) and decreased decomposition (Höll et al 2009) decades after restoration have been found. These apparent controversies may partly reflect methodological differences arising from e.g.…”

Section: Discussionmentioning

confidence: 99%

“…However, they seem to be controversial to some extent. For example, both successes and failures of regaining original water table level (Worrall et al 2007, Klimkowska et al 2010 as well as both intended and unintended effects on water chemistry (Höll et al 2009, Wilson et al 2011a have been reported. Despite the results from some early case studies (Jauhiainen et al 2002, Tarvainen et al 2013, the effects of boreal peatland restoration on surface peat chemistry -another important environmental factor -are not well understood.…”

Section: Degradation and Restoration Of Peatland Ecosystemsmentioning

confidence: 99%

“…For example, both successes and failures of regaining original water table level (Worrall et al 2007;Klimkowska et al 2010; as well as both intended and unintended effects on water chemistry (Höll et al 2009;Wilson et al 2011a, b) have been reported. While bringing urgently needed data on the poorly understood hydrological effects of peatland restoration, most studies have covered only a few sites and only the time period of first few years after restoration.…”

Section: Introductionmentioning

confidence: 99%

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Fighting carbon loss of degraded peatlands by jump-starting ecosystem functioning with ecological restoration

Kareksela

Haapalehto

Juutinen

et al. 2015

Science of The Total Environment

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Esitetään Jyväskylän yliopiston matemaattis-luonnontieteellisen tiedekunnan suostumuksella julkisesti tarkastettavaksi yliopiston vanhassa juhlasalissa S212 maaliskuun 28. päivänä 2014 kello 12.Academic dissertation to be publicly discussed, by permission of the Faculty of Mathematics and Science of the University of Jyväskylä, in building Seminarium, auditorium S212, on March 28, 2014 at 12 o'clock noon. The wide and rapidly increasing human land use has caused extensive degradation of natural landscapes, extinctions of species and loss of ecosystem functions and services. Subsequently, ecological restoration has been raised to a major global strategy for safeguarding ecosystem values. However, concerns have been raised on the real potential of restoration to re-establish ecosystem structures and functions. Here, I studied the effects of ecological restoration on the structure and functions of forestry drained boreal peatland ecosystems in southern Finland. To better understand structural and functional changes, the effects of drainage and restoration on water table level, pore water chemistry and peat chemistry were explored as well. Drainage lowered the water table and induced changes in pore water chemistry and plant community composition. Drainage retarded the accumulation of surface peat and resulted in significant reduction in the sequestration of carbon therein. Re-establishment of water table level and significant recovery of pore water and surface peat chemistry were observed after restoration. Restoration induced the recovery of ecosystem structure i.e. plant community composition towards the target. The recovery was dependent on the within-site degree of ecosystem degradation. The original ecosystem structure was not needed for the re-establishment of important peatland ecosystem functionality in terms of surface peat accumulation. However, a more profound recovery of structure and conditions may be needed for some other functions like surface peat carbon sequestration to recover. Overall, my results are promising from the perspective of restoration. However, they highlight the need for patience in drawing conclusions on the effectiveness of restoration. Practitioners should also be prepared for temporarily increased leaching of nutrients into downstream water courses. UNIVERSITY

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The effect of long-term water table manipulations on dissolved organic carbon dynamics in a poor fen peatland

Hribljan

Kane

Pypker

et al. 2014

J. Geophys. Res. Biogeosci.

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Dissolved organic carbon (DOC) production, consumption, and quality displayed differences after long-term (~55 years) hydrological alterations in a poor fen peatland in northern Michigan. The construction of an earthen levee resulted in areas of a raised and lowered water table (WT) relative to an unaltered intermediate WT site. The lowered WT site had greater peat aeration and larger seasonal vertical WT fluctuations that likely elevated peat decomposition and subsidence with subsequent increases in bulk density, vertical hydraulic gradient, decreased hydraulic conductivity (K sat ), and a greater pore water residence time relative to the unaltered site. The raised WT site displayed a decreased K sat combined with seasonal upwelling events that contributed to a longer residence time in comparison to the unaltered site. These differences are potentially contributing to elevated DOC concentrations at the lowered and raised WT site relative to the unaltered site. Additionally, spectrophotometric indices and chemical constituent assays indicated that the lowered site DOC was more aromatic and contained elevated concentrations of phenolics compared to the intermediate site. The raised site DOC was less aromatic, less humified, and also had a greater phenolic content than the intermediate site. Furthermore, an incubation experiment showed that DOC in the raised site contained the greatest labile carbon source. Based on our results, long-term WT alterations will likely impose significant effects on DOC dynamics in these peatlands; however, WT position alone was not a good predictor of DOC concentrations, though impoundment appears to produce a more labile DOC whereas drainage increases DOC aromaticity.

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Characteristics of dissolved organic matter following 20years of peatland restoration

Cited by 83 publications

References 35 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

Fighting carbon loss of degraded peatlands by jump-starting ecosystem functioning with ecological restoration

The effect of long-term water table manipulations on dissolved organic carbon dynamics in a poor fen peatland

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Characteristics of dissolved organic matter following 20years of peatland restoration

Cited by 83 publications

References 35 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

Fighting carbon loss of degraded peatlands by jump-starting ecosystem functioning with ecological restoration

The effect of long-term water table manipulations on dissolved organic carbon dynamics in a poor fen peatland

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Product

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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