Compositional variety of soil organic matter in mollic floodplain-soil profiles - Also an indicator of pedogenesis

Rennert, Thilo; Georgiadis, Anna; Ghong, Nchia Peter; Rinklebe, Jörg

doi:10.1016/j.geoderma.2017.09.039

Cited by 22 publications

(17 citation statements)

References 44 publications

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“…The smaller the value of this ratio multiplied by 100 (r2930), the more oxidised and transformed the SOM, whereas large values indicate fresh plant-derived OM such as free POM (Rennert et al 2017;Rennert 2018). Due to the sandy texture of the soils and the associated predominant presence of numerous Si-O groups, the peak at 1159 cm -1 was, unlike in previous studies (Rennert 2018;Rennert et al 2018), not considered for the calculation of r2930. Additionally, the intensities at 1718 (carboxyl, also in aromatic esters; Veum et al 2014), 1620, 1520 and 1395 cm -1 (carboxylate; Dick et al 2003) were normalised with division by the SOC content.…”

Section: Analysesmentioning

confidence: 94%

Podzolisation affects the spatial allocation and chemical composition of soil organic matter fractions

2020

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Podzols are soils that display a unique vertical distribution of soil organic matter (SOM). We hypothesise that podzolisation, as a pedogenetic process, influences or even controls content, allocation and quality of SOM. We determined soil organic carbon (SOC) and nitrogen (N) contents in six SOM fractions obtained from mineral horizons of five soils with increasing degree of podzolisation: sand and stable aggregates (S + A), particulate organic matter (POM) > 63 mm and <63 mm, silt and clay (s + c), resistant SOC and dissolved organic matter. We applied infrared spectroscopy to evaluate SOM decomposition state, relative abundance of functional groups and SOM-metal complexation. In topsoil horizons, relative SOC allocation shifted from the larger to the smaller size POM fraction with increasing podzolisation. Accompanied with size reduction, the POM < 63 mm fraction was progressively less decomposed, as derived from infrared spectroscopy and C : N ratios. In illuvial subsoils, the proportion of SOC in the S + A fraction increased with increasing podzolisation, implying SOM accumulation in aggregates and coatings on sand grains. Elevated abundance of carboxylate and aromatic C in the s + c fractions of subsoil horizons indicated their preferred sorption. Additionally, metal-carboxyl complexation increased during podzolisation.

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Section: Analysesmentioning

confidence: 94%

Podzolisation affects the spatial allocation and chemical composition of soil organic matter fractions

2020

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“…This result explains the dark color of the lowest horizon and justifies its designation as 2Chkl (Fig. 2), while suggesting one of the following: a) the 2Chkl horizon belongs to a paleosol, indicating weathering processes at the former floodplain surface during decreased flooding [65], or b) the 2Chkl horizon represents a SOM-enriched deposit, which accumulated due to the fluvial erosion of the upstream topsoils and their subsequent deposition downstream [50].…”

Section: Particle Size Distribution Of the Analyzed Soils As Shown In The Tablementioning

confidence: 55%

“…Accordingly, clay minerals in such soils are often poorly transformed [57]. Moreover, SOM in fluvial soils is not always formed in situ, but can originate from previously eroded soil materials [50]. Therefore, differences in soil properties and/or mineralogical compositions across and within the floodplain profiles should imply different sources of the material, varying erosional/depositional processes, and changing environmental conditions.…”

Section: Soil Physicsmentioning

confidence: 99%

“…Therefore, correlating the two classification systems is sometimes a challenge. Although several papers evaluate various aspects of soil classification according to the WRB system [12,14,19,31,50,53], no work seems to refer specifically to vertic gley soils, as soils that can have considerable, but constrained, agricultural potential [30,32,45]. Hence, it is important to assess the efficiency of the WRB system in identifying, describing, and depicting the management-related properties of such soils.…”

Section: Soil Physicsmentioning

confidence: 99%

“…All analyzed soil profiles (especially their topsoils) are rich in C org (Table 3). Soils developed on river floodplains in temperate zones are usually characterized by enhanced contents of SOM and to greater depth, relative to terrestrial soils [50]. By forming organo-mineral complexes, as well as by decreasing soil drainage and aeration, high clay content in Croatian Gleysols often leads to accumulation and preservation of SOM in a hydromorphic (aquatic) form [30].…”

Section: Particle Size Distribution Of the Analyzed Soils As Shown In The Tablementioning

confidence: 99%

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Plasticity, Mineralogy, and WRB Classification of Some Typical Clay Soils along the Two Major Rivers in Croatia

et al. 2020

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Quantification of soil plasticity is usually based on Atterberg limits or indices, which are then used for engineering and agricultural purposes on clay soils. Because these limits/indices are seldom analyzed during routine soil surveys, they are sometimes estimated from available soil properties using pedotransfer functions (PTFs). Main aim of this study was to test if two robust PTFs, previously created by other authors for other soils/areas, may be used for predicting plasticity of typical clay soils on fluvial deposits in Croatia. We analyzed mineralogy, plasticity, and related physicochemical properties of four representative soil profiles along Sava and Drava, two longest Croatian rivers. Particle size distribution patterns pointed to more uniform sedimentation along Sava, compared to Drava. Also, more clay was found within Sava profiles. Soil texture was finer farther away from the sources of both rivers. Soil cation exchange capacity (CEC) was almost fully positively correlated to clay content. On the other hand, C org content showed no correlation to CEC. This is attributed to the significant presence of smectite across all studied soils. Clay was recognized as the main factor influencing soil plasticity. When compared to the measured values, the predicted values of plasticity index and liquid limit were heavily underestimated. Hence, region-specific PTFs should be developed for more accurate prediction of plasticity in these soils. According to the WRB-2015, the soils were classified as Eutric Reductigleyic Stagnic Gleysols (Clayic, Humic, Protovertic). Because soils were not dry during field description, shrink-swell cracks were not prominent, and therefore soils were not classified as Vertisols. We suggest that field criteria for classification of Vertisols should not depend on actual soil moisture. Instead, plastic limits/indices could be used.

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Drivers for soil organic carbon stabilization in Elbe River floodplains

Heger,

Becker,

Vásconez

et al. 2024

J. Plant Nutr. Soil Sci.

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BackgroundFloodplains play an important role in the global carbon (C) cycle, particularly due to their large soil organic carbon (SOC) storage potential. However, a heterogeneous microrelief and anthropogenic landscape modifications complicate the understanding of stabilization processes of SOC in floodplains.AimDetermining the predominant drivers for SOC stabilization in Elbe River floodplain soils.MethodsWe measured SOC density fractions, microbial biomass, and mineralization characteristics in top‐ and subsoils of eight floodplain sites of the lower middle Elbe River.ResultsThe heavy fraction (HF) was the most important SOC pool, with a contribution of >64% at both depth intervals. With soil depth, HF pool size increased and the occluded light fraction (oLF) decreased, whereas the free LF (fLF) stayed the same. The contribution of the HF to SOC was positively related to fine texture (R2 = 0.64). Mineralizable C was negatively related to fine texture at both depth intervals. Both results suggest a positive effect of fine texture on SOC stabilization. The metabolic quotient was related to the amount of available SOC in the topsoil, but no relation was found in the subsoil. However, in top‐ and subsoil, the mineralization rate constant was positively related to the C/N ratios of the fLF and the oLF, indicating that the quality of fresh plant litter is an important energy source for microbial mineralization.ConclusionSedimentation of fine‐textured material is the most important driver for SOC stabilization rather than fresh plant litter input. Thus, SOC stabilization strongly depends on relief, flooding, and sedimentation.

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Compositional variety of soil organic matter in mollic floodplain-soil profiles - Also an indicator of pedogenesis

Cited by 22 publications

References 44 publications

Podzolisation affects the spatial allocation and chemical composition of soil organic matter fractions

Podzolisation affects the spatial allocation and chemical composition of soil organic matter fractions

Plasticity, Mineralogy, and WRB Classification of Some Typical Clay Soils along the Two Major Rivers in Croatia

Drivers for soil organic carbon stabilization in Elbe River floodplains

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