Seasonal dynamics of soil salinity in peatlands: A geophysical approach

Walter, J.; Lück, Erika; Bauriegel, Albrecht; Facklam, Michael; Zeitz, Jutta

doi:10.1016/j.geoderma.2017.08.022

Cited by 34 publications

(24 citation statements)

References 24 publications

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“…5) and even when the total porosity is higher for the organic gyttja, the pore-size distribution of both gyttja types is similar. The additional contributions of CEC and SOM leading to steeper slopes are also observed in peat in contrast to sand samples by Walter et al (2018) and, as mentioned before, in mineral substrates (McKenzie, Chomistek and Clark 1989;Hanson and Kaita 1997;Lück et al 2009).…”

Section: Comparison Of Peat and Gyttja Samplessupporting

confidence: 64%

“…The additional contributions of CEC and SOM leading to steeper slopes are also observed in peat in contrast to sand samples by Walter et al . () and, as mentioned before, in mineral substrates (McKenzie, Chomistek and Clark ; Hanson and Kaita ; Lück et al . ).…”

Section: Resultsmentioning

confidence: 58%

“…; Walter et al . , , ), although saturated and unsaturated conditions have to be clearly distinguished. In natural peatlands with water saturated conditions, electrolytic conduction via the pore fluid is the major pathway for the electrical current (Comas and Slater ; Walter et al .…”

Section: Introductionmentioning

confidence: 99%

“…Geophysical techniques, such as electrical resistivity tomography (ERT) are promising tools to provide data on peatland stratigraphy (Slater and Reeve 2002;Kettridge et al 2008;Comas et al 2015;Walter et al 2015Walter et al , 2016 and peat properties (Comas and Slater 2004;Kettridge et al 2008;Ponziani, Slob and Ngan-Tillard 2012;Comas et al 2015;Walter et al 2015Walter et al , 2016 more rapidly and at various spatial scales. When using ERT on peatlands, the electrical conductivity (reciprocal of resistivity) is closely related to the water content (Comas and Slater 2004;Ponziani et al 2012;Walter et al 2015Walter et al , 2016Walter et al , 2018, although saturated and unsaturated conditions have to be clearly distinguished. In natural peatlands with water saturated conditions, electrolytic conduction via the pore fluid is the major pathway for the electrical current (Comas and Slater 2004;Walter et al 2015;Walter et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Relationship between electrical conductivity and water content of peat and gyttja: implications for electrical surveys of drained peatlands

Walter

Lück

Heller

et al. 2019

Near Surface Geophysics

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The application of electrical resistivity tomography to peatlands supports conventional coring by providing data on the current condition of peatlands, including data on stratigraphy, peat properties and thickness of organic deposits. Data on the current condition of drained peatlands are particularly required to improve estimates of carbon storage as well as losses and emissions from agriculturally used peatlands. However, most of the studies focusing on electrical resistivity tomography surveys have been conducted on natural peatlands with higher groundwater levels. Peatlands drained for agriculture have not often been studied using geophysical techniques. Drained sites are characterized by low groundwater levels and high groundwater fluctuations during the year, which lead to varying levels of water saturation. To validate better electrical resistivity tomography surveys of drained peatlands, the aim of this laboratory study is to investigate the influence of varying water saturation levels on electrical conductivity (reciprocal of resistivity) for a variety of peat and gyttja types, as well as for different degrees of peat decomposition. Results show that different levels of water saturation strongly influence bulk electrical conductivity. Distinct differences in this relationship exist between peat and gyttja substrates and between different degrees of peat decomposition. Peat shows an exponential relationship for all degrees of decomposition, whereas gyttja, in particular organic‐rich gyttja, is characterized by a rather unimodal relationship. The slopes for the relationship between electrical conductivity and water content are steeper at high degrees of decomposition than for peat of low degrees of decomposition. These results have direct implications for field electrical resistivity tomography surveys. In drained peatlands that are strongly susceptible to drying, electrical resistivity tomography surveys have a high potential to monitor the actual field water content. In addition, at comparable water saturations, high or low degrees of decomposition can be inferred from electrical conductivity.

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Section: Comparison Of Peat and Gyttja Samplessupporting

confidence: 64%

Section: Resultsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Relationship between electrical conductivity and water content of peat and gyttja: implications for electrical surveys of drained peatlands

Walter

Lück

Heller

et al. 2019

Near Surface Geophysics

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“…Studies of Zhang, Xue, and Chen () and Liu, Yu, Xu, and Chen () showed that soil salinization in the southern coast of Laizhou Bay is mainly affected by groundwater TDS and depth. Groundwater TDS and depth mainly affect the transfer, accumulation, and release of soil salinity (Salama, Otto, & Fitzpatrick, ; Walter, Lück, Bauriegel, Facklam, & Zeitz, ). Therefore, two main control factors of salinization, that is, groundwater TDS and depth, were selected in this study to explore their effects on regional soil salinization.…”

Section: Discussionmentioning

confidence: 99%

Three‐dimensional mapping of soil salinity in the southern coastal area of Laizhou Bay, China

Liu

Lü

et al. 2018

Land Degrad Dev

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Soil salinization is an important driver of land degradation and has been a major factor inhibiting agricultural production and development in the southern coastal area of Laizhou Bay. In this study, 3‐D and 2‐D geostatistics were respectively used to evaluate the spatial distribution of soil salinity and groundwater total dissolved solids (TDS) and depth. Results showed that soil electrical conductivity differed greatly within the same soil layer, and the difference in average electrical conductivity of different soil layers was relatively small. The mean value of TDS exceeded 3.0 g L−1 and the mean value of groundwater depth was 13.359 m. The geographic distribution showed that the soil salinity gradually decreased from the north to the south horizontally, and the soil salinity showed a bottom accumulation tendency vertically. Over 90% of the study area has TDS values exceeding 1.0 g L−1, and approximately one‐third of the area had a groundwater depth less than 3.0 m. TDS and groundwater depth had good correlations with soil salinity, with coefficients of determination of 0.544 and 0.572, respectively. Changes in vegetation corresponded to changes in soil salinity. Soil salinity gradually decreased perpendicular to coastal lines in tidal flats without vegetative coverage to inland agricultural areas of wheat and vegetables. Soil salinization in the study area is mainly slight and moderate. Reasonable regional management measures are conducive to improving land economic benefits. The results provide a theoretical basis and reference for the partition, improvement, management of saline soil, and support for land degradation control.

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Application of a vertical ‘electric sieve’ to mitigate and prevent salinization in coastal soil

Zhao

Huang

et al. 2022

Land Degrad Dev

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This study explored the applications of a vertical electrokinetic system (V-EK), which consists of multilayer electrodes positioned in shallow soil to form an 'electric sieve' to mitigate and prevent soil salinization caused by salts rising from saline groundwater in coastal areas. The experiments were conducted in column reactors in the laboratory. Compared to the control column, the level of ions in the surface soil was significantly reduced after the V-EK treatment, particularly for the column with voltages at 10 V and 20 V. At a voltage of 20 V, Na + was detected at a range of 0.06-0.08 mg g À1 in the surface soil; this is a >99% reduction compared to the controls. Similar efficacy was observed for Cl À in the V-EK column. The concentrations of Cl À were detected with a range of 0.01-0.02 mg g À1 and 0.02-0.06 mg g À1 at the surface soil with a voltage of 20 V and 10 V, respectively, compared to the Cl À concentrations at 0.84-2.70 mg g À1 in the control. After the application of the vertical 'electric sieve', the total salt content of surface soil could be controlled at a low value (<0.25‰) at voltages of 10 V and 20 V, compared to that in the control column (4.86‰). Finally, rising of salts from the artificial saline groundwater was effectively mitigated under voltages of 10 V and 20 V. Results from this work have demonstrated that the 'electric sieve' can effectively mitigate and prevent salts from rising in shallow groundwater to surface soil and reduce soil salinity.

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Seasonal dynamics of soil salinity in peatlands: A geophysical approach

Cited by 34 publications

References 24 publications

Relationship between electrical conductivity and water content of peat and gyttja: implications for electrical surveys of drained peatlands

Relationship between electrical conductivity and water content of peat and gyttja: implications for electrical surveys of drained peatlands

Three‐dimensional mapping of soil salinity in the southern coastal area of Laizhou Bay, China

Application of a vertical ‘electric sieve’ to mitigate and prevent salinization in coastal soil

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