Torfeigenschaften und ungesättigte hydraulische Leitfähigkeit von Moorböden

Bartels, R.; Kuntze, H.

doi:10.1002/jpln.19731340205

Cited by 11 publications

(6 citation statements)

References 3 publications

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“…This may be an effect of different peat degradation and plant composition of the peat substrates, with pure sphagnum at the south monitoring well and the combination of sphagnum, sedges, heather meadows, and bog pines at the central monitoring well. According to Bartels and Kuntze (1968), pristine sphagnum peat is characterized by a more abrupt dewatering characteristic than less pristine sphagnum peat. In former centuries, the central monitoring well was probably partly affected by nearby ditch drainage.…”

Section: Resultsmentioning

confidence: 99%

Deriving Effective Soil Water Retention Characteristics from Shallow Water Table Fluctuations in Peatlands

Dettmann¹,

Bechtold²

2016

Vadose Zone Journal

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We have developed a novel and simple approach that can be used to derive effective in situ soil water retention characteristics from field monitoring time series in peatlands. The simplicity of the approach is given by the very limited data requirements, which comprise only precipitation, water table, and, if relevant, microrelief data. Our approach is built on two main assumptions: (i) for shallow groundwater systems, the soil moisture profile is always close to hydrostatic equilibrium; and (ii) during short time periods of high precipitation, the water storage change due to lateral fluxes is small compared with the precipitation input. Given these assumptions, the height of a water table rise due to a precipitation event mainly depends on the soil water retention characteristics, the precipitation amount, the initial water table depth, and, if present, the microrelief. In this study, this dependency was used to determine the effective van Genuchten parameters by Bayesian inversion assuming a uniform soil profile. We applied our concept to field data from a peatland with microrelief. Results indicated that observations of water table rises caused by precipitation events can contain sufficient information to constrain the soil water retention characteristics around monitoring wells in peatlands to plausible ranges. In principle, the approach should also be applicable to other shallow groundwater systems. Application limits and potential systematic errors are discussed.

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Section: Resultsmentioning

confidence: 99%

Deriving Effective Soil Water Retention Characteristics from Shallow Water Table Fluctuations in Peatlands

Dettmann¹,

Bechtold²

2016

Vadose Zone Journal

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“…The specific effects of ash content on water retention properties and oxygen penetration in peat soils have been barely addressed. Increasing ash content in fen peat has been reported to result in greater water retention and such relation was observed at ash content ranging between 21% and 29% [ Bartels and Kuntze , 1973]. Interestingly, this range of ash content fits well with the inhibition of oxygen penetration observed in some profiles in our study; no oxygen penetration occurred during minor water table fluctuations in C2 and C3 plots (Figure 4), where the ash content generally was within that range or even higher (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Controls on in situ oxygen and dissolved inorganic carbon dynamics in peats of a temperate fen

2012

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[1] Changes in hydrological conditions are expected and may alter carbon cycling in peatlands. Peat aeration with water table change has not commonly been investigated, and the water table is often assumed to constitute the oxic-anoxic boundary in peat. We analyzed temperature, moisture, oxygen (O 2 ), and carbon dioxide (CO 2 ) concentrations in profiles of a temperate fen during two seasons. A drying-rewetting cycle and flooding were induced and compared to controls. The response of moisture and water table position varied greatly and was related to gradients of peat compaction and ash content. Background drought raised air-filled porosity (AFP) to a maximum of 15%-38% in shallow peat and experimental drought up to 50%. Decline in water table and soil moisture broadly led to O 2 penetration and CO 2 degassing, and rewetting and flooding led to anoxic conditions and CO 2 accumulation in peat pore water. In dense peat with ≥20% ash content the unsaturated zone remained partly low in oxygen, however, and up to 5% AFP and 20 cm above water table O 2 concentrations frequently remained below 50 mmol L À1. Moderately intense and short drying did not induce substantial oxygen penetration in the compacted soil profiles. The likelihood of the presence of oxygen in the peat was predicted by logistic regression using water table and ash content or bulk density as predictors (p < 0.0005). The model is potentially useful for predicting the position of the redoxcline in peat deposits and may assist in improving statistical models of trace gas emission from peatlands.Citation: Estop-Aragonés, C., K.-H. Knorr, and C. Blodau (2012), Controls on in situ oxygen and dissolved inorganic carbon dynamics in peats of a temperate fen,

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“…These dissimilarities can be explained not only by differences in peat characteristics related to bulk density, but also by differences in plant residues, cell structure and peat pore geometry. Unsaturated hydraulic conductivity values determined by Bartels and Kuntze (1973), Illner and Raasch (1977) indicated negative slopes for log-log relationships between unsaturated hydraulic conductivity and pressure head which depend on the degree of peat decomposition. Renger et al (1976) obtained similar results for 11 peat soils with different degree of decomposition and solid matter volume.…”

Section: Introductionmentioning

confidence: 98%

“…Description of water flow and solute and contaminant transport in the unsaturated zone requires knowledge of the soil hydraulic relations between moisture content, pressure head and unsaturated hydraulic conductivity; namely the soil moisture retention curve, θ(h) and the unsaturated hydraulic conductivity function, K(h) or K(θ). In peat soils, moisture retention properties were studied by Boelter (1969), Päivänen (1973), Schouwenaars and Vink (1992), Schäfer (1996), Weiss et al (1998) and unsaturated hydraulic conductivity by Bartels and Kuntze (1973), Renger et al (1976), Illner and Raasch (1977). The data published by Boelter (1969) for Minnesota moss and herbaceous peat as well as peat with high wood content and also the data of Päivänen (1973) for Sphagnum dominated peat soils in Finland indicated that moisture retention characteristic is dependent on the degree of decomposition.…”

Section: Introductionmentioning

confidence: 99%