The mobilisation of phosphorus, organic carbon and ammonium in the initial stage of fen rewetting (a case study from NE Germany)

Zak, Dominik; Gelbrecht, Jörg

doi:10.1007/s10533-007-9122-2

Cited by 169 publications

(157 citation statements)

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“…Below, slightly to moderately decomposed peat (H 3 to 6) can be found which has either not been affected by the drainage or has been only slightly affected. Long-term drainage and previous agricultural use led to a loss of organic carbon (due to peat oxidation) and, therefore, to an enrichment of P and N with decreasing molar ratios of C:P and C:N in upper soil layers (Zak and Gelbrecht 2007). Concurrently, organic bound P and N was transformed into labile inorganic forms (peat mineralization) supporting the internal eutrophication of the peat soils (Zak et al 2008).…”

Section: Site Descriptionmentioning

confidence: 98%

“…Since then, field measurements of gas exchange have been performed at this site (see introduction and discussion). Due to substantial peat loss and shrinkage, the Zarnekow polder now appears as a shallow lake permanently inundated with a water level of about +0.1 to +0.5 m (Zak and Gelbrecht, 2007). The subjacent peat layer is up to 10 m thick.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Since the second year of inundation, the water body of the shallow lake has been dominated by water plants like Ceratophyllum and Lemna sp. adapted to (Puustjärvi, 1970;Zak and Gelbrecht, 2007). d Organic matter in % of dry weight determined by loss of ignition.…”

Section: Site Descriptionmentioning

confidence: 99%

“…For the analysis of pore water chemistry, rechargeable dialysis samplers were used, as described in detail by Zak and Gelbrecht (2007). Briefly, the one-chamber-sampler (∼0.05 L) was adjusted in the peat at 1-11 cm depth at the beginning of the incubation experiment.…”

Section: Peat Layer Incubation: Experimental Set Up and Chemical Analmentioning

confidence: 99%

“…It has previously been shown that this layer releases large quantities of nutrients and dissolved organic carbon once waterlogged conditions have been re-established in peat (Zak and Gelbrecht, 2007). Furthermore, primary production and the deposition of plant litter in the top layer may increase CH 4 emissions under anoxic conditions (Tuittila et al, 2000;Juutinen et al, 2003;Wilson et al, 2008), as labile organic matter is a prerequisite for anaerobic CO 2 and CH 4 formation (Glatzel et al, 2004;Segers, 1998;Conrad, 1989).…”

mentioning

confidence: 99%

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Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH4 and CO2

et al. 2011

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Abstract. Peatland restoration by inundation of drained areas can alter local greenhouse gas emissions as CO 2 and CH 4 . Factors that can influence these emissions include the quality and amount of substrates available for anaerobic degradation processes and the sources and availability of electron acceptors. In order to learn about possible sources of high CO 2 and CH 4 emissions from a rewetted degraded fen grassland, we performed incubation experiments that tested the effects of fresh plant litter in the flooded peats on pore water chemistry and CO 2 and CH 4 production and emission.The position in the soil profile of the pre-existing drained peat substrate affected initial rates of anaerobic CO 2 production subsequent to flooding, with the uppermost peat layer producing the greatest specific rates of CO 2 evolution. CH 4 production rates depended on the availability of electron acceptors and was significant only when sulfate concentrations were reduced in the pore waters. Very high specific rates of both CO 2 (maximum of 412 mg C d −1 kg −1 C) and CH 4 production (788 mg C d −1 kg −1 C) were observed in a new sediment layer that accumulated over the 2.5 years since the site was flooded. This new sediment layer was characterized by overall low C content, but represented a mixture of sand and relatively easily decomposable plant litter from reed canary grass killed by flooding. Samples that excluded this new sediment layer but included intact roots remaining from flooded grasses had specific rates of CO 2 (max. 28 mg C d −1 kg −1 C) and CH 4 (max. 34 mg C d −1 kg −1 C) production that were Correspondence to: M. Hahn-Schöfl (maria.hahn@yahoo.de) 10-20 times lower than for the new sediment layer and were comparable to those of a newly flooded upper peat layer. Lowest rates of anaerobic CO 2 and CH 4 production (range of 4-8 mg C d −1 kg −1 C and <1 mg C d −1 kg −1 C) were observed when all fresh organic matter sources (plant litter and roots) were excluded. In conclusion, the presence of fresh organic substrates such as plant and root litter originating from plants killed by inundation has a high potential for CH 4 production, whereas peat without any fresh plant-derived material is relatively inert. Significant anaerobic CO 2 and CH 4 production in peat only occurs when some labile organic matter is available, e.g. from remaining roots or root exudates.

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Section: Site Descriptionmentioning

confidence: 98%

Section: Site Descriptionmentioning

confidence: 99%

Section: Site Descriptionmentioning

confidence: 99%

Section: Peat Layer Incubation: Experimental Set Up and Chemical Analmentioning

confidence: 99%

mentioning

confidence: 99%

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Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH4 and CO2

et al. 2011

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Increasing concentrations of iron in surface waters as a consequence of reducing conditions in the catchment area

et al. 2016

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Recent studies report trends of strongly increasing iron (Fe) concentrations in freshwaters. Since Fe is a key element with a decisive role in the biogeochemical cycling of major elements, it is important to understand the mechanisms behind these trends. We hypothesized that variations in Fe concentration are driven mainly by redox dynamics in hydraulically connected soils. Notably, Fe(III), which is the favored oxidation state except in environments where microbial activity provide strong reducing intensity, has several orders of magnitude lower water solubility than Fe(II). To test our hypothesis, seasonal variation in water chemistry, discharge, and air temperature was studied in three Swedish rivers. Methylmercury and sulfate were used as indicators of seasonal redox changes. Seasonal variability in water chemistry, discharge, and air temperature in the Emån and Lyckeby Rivers implied that the variation in Fe was primarily driven by the prevalence of reducing conditions in the catchment. In general, high Fe concentrations were observed when methylmercury was high and sulfate was low, indicative of reducing conditions. The Fe concentrations showed no or weak relationships with variations in dissolved organic matter concentration and aromaticity. The seasonal variation in Fe concentration of the Ume river was primarily dependent on timing of the snowmelt in high‐ versus low‐altitude areas of the catchment. There were long‐term trends of increasing temperature in all catchments and also trends of increasing discharge in the southern rivers, which should increase the probability for anaerobic conditions in space and time and thereby increase Fe transport to the aquatic systems.

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Using eDNA presence/non‐detection data to characterize the abiotic and biotic habitat requirements of a rare, elusive amphibian

et al. 2022

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The environmental DNA (eDNA) approach has already been established as a valuable tool for the detection and monitoring of rare and elusive species. However, its application is not limited to assessing whether or not a species is present in a given area. In this study, we collected environmental data from 48 aquatic locations that had previously been investigated in an eDNA‐based study. We sought to determine the abiotic and biotic factors that could explain the presence or non‐detection of Hula painted frog DNA at those locations, in order to characterize this rare species’ little studied habitat requirements. We found that the detection probability of this species decreased substantially with increasing phosphorus loads as well as in the presence of the wetland plant Lythrum salicaria. By contrast, the detection probability increased markedly when Phragmites australis or Ludwigia stolonifera constituted part of the dominant aquatic vegetation. Our results expand the knowledge on this elusive frog species and contribute valuable information for future habitat restoration plans. They further show that eDNA data can also be used to characterize the putative habitats of species where such data are scarce or even totally lacking.

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The mobilisation of phosphorus, organic carbon and ammonium in the initial stage of fen rewetting (a case study from NE Germany)

Cited by 169 publications

References 33 publications

Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH<sub>4</sub> and CO<sub>2</sub>

Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH<sub>4</sub> and CO<sub>2</sub>

Increasing concentrations of iron in surface waters as a consequence of reducing conditions in the catchment area

Using eDNA presence/non‐detection data to characterize the abiotic and biotic habitat requirements of a rare, elusive amphibian

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The mobilisation of phosphorus, organic carbon and ammonium in the initial stage of fen rewetting (a case study from NE Germany)

Cited by 169 publications

References 33 publications

Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH&lt;sub&gt;4&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt;

Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH&lt;sub&gt;4&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt;

Increasing concentrations of iron in surface waters as a consequence of reducing conditions in the catchment area

Using eDNA presence/non‐detection data to characterize the abiotic and biotic habitat requirements of a rare, elusive amphibian

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Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH<sub>4</sub> and CO<sub>2</sub>

Organic sediment formed during inundation of a degraded fen grassland emits large fluxes of CH<sub>4</sub> and CO<sub>2</sub>