Bacterial impact on the wetting properties of soil minerals

Achtenhagen, Jan; Goebel, Marc‐Oliver; Miltner, Anja; Woche, Susanne K.; Kästner, Matthias

doi:10.1007/s10533-014-0040-9

Cited by 21 publications

(18 citation statements)

References 57 publications

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“…The enhanced microbial activity may result in an increased production of exudates and mucilage which may provoke hydrophobic conditions in the Ss. The increment of microbial biomass may lead to a release of amphiphilic cell wall components during the decay of the OS (Achtenhagen et al, 2015), which could be described as a secondary process. These findings were not reflected in the results for the Ut3, because no positive correlations could be found between the increasing hydrophobicity with decreasing microbial activity, but a decreasing BAS with rising RI.…”

Section: Discussionmentioning

confidence: 99%

Compared impact of compost and digestate on priming effect and hydrophobicity of soils depending on textural composition

Voelkner

Diercks

Horn

2019

Die Bodenkultur: Journal of Land Management, Food and Environment

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Summary Digestates and compost are used as valuable fertilizers in agriculture because of their benefits for plant nutrition and carbon sequestration potential. These amendments are also suspected to interfere negatively with the soil. To compare their relevance for priming effect and hydrophobicity of soils, two amounts of digestate or compost, respectively, were mixed with a homogenized cambic Luvisol and a Podzol. The basal respiration rate (BAS), the repellency index (RI) and organic carbon content (Corg) of pre-dried mixtures were investigated. The podsolic mixture showed quantitative reduction of Corg and increased BAS (this effect was not statistically significant) due to priming effect through microbial stimulation. As a result of enhanced organic substance (OS) protection in the cambic Luvisol mixture, constant amounts of Corg and declined BAS could be detected. The wettability was reduced in both soils: either directly by the supply of amphiphilic components or indirectly by increased incorporation of microbial exudates. This reduction was not statistically significant. Higher contents of available organic compounds in digestates and higher amounts of hydrophobic humic acids in the compost could be assumed to be decisive for generation of hydrophobicity. Also the soil texture controlled the microbial decomposition by higher incorporation of OS in finer pores and contributed to the protection against microbial decay.

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Section: Discussionmentioning

confidence: 99%

Compared impact of compost and digestate on priming effect and hydrophobicity of soils depending on textural composition

Voelkner

Diercks

Horn

2019

Die Bodenkultur: Journal of Land Management, Food and Environment

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“…Adsorption of OM on minerals and the formation of MOA is closely related to changes in soil water repellency, a widespread natural phenomenon in the soil ( Goebel et al., ; Achtenhagen et al., ). The multilayer model has been used to explain the dynamics and reversibility of soil water repellency under drying and wetting cycles ( Horne and McIntosh , ; Goebel et al., ; Achtenhagen et al., ; Kaiser et al., ). Diehl et al.…”

Section: Application Of the Multilayer Model In Soil Science And Relamentioning

confidence: 99%

“…Adsorption of OM on minerals and the formation of MOA is closely related to changes in soil water repellency, a widespread natural phenomenon in the soil (Goebel et al, 2011;Achtenhagen et al, 2015). The multilayer model has been used to explain the dynamics and reversibility of soil water repellency under drying and wetting cycles (Horne and McIntosh, 2000;Goebel et al, 2011;Achtenhagen et al, 2015;Kaiser et al, 2015). Diehl et al (2009) used the multilayer model to explain the increased normalized C-H peak area of soils (obtained by diffuse reflectance infrared Fourier transform spectroscopy) with increasing dryness, interpreting it as an increase in the proportion of outward-oriented hydrophobic moieties in the outer layer of OM.…”

Section: Soil Wettabilitymentioning

confidence: 99%

The multilayer model of soil mineral–organic interfaces—a review

Gao

Mikutta

Jansen

et al. 2019

J. Plant Nutr. Soil Sci.

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Association of organic matter (OM) with minerals is an important pathway in the formation of stable OM in soil. While the importance of mineral-organic associations (MOA) in regulating soil carbon cycling has been rigorously demonstrated by empirical evidence, knowledge about the molecular-scale arrangement of OM at mineral surfaces is still lacking. Such knowledge is urgently needed to disentangle the mechanisms of long-term storage of soil OM. Based on indirect observations regarding the formation, composition, and structure of MOA, a conceptual multilayer model was proposed by Kleber et al. in 2007 to foster debate and help elucidating the structure and reactivity of MOA. According to this model, the associated OM at mineral surfaces is discrete and self-organized into a multilayer structure. In this review, we aim to collect and evaluate existing studies that used this model to explain biogeochemical processes at mineral-organic interfaces, and based on this, assess the applicability of the model. The multilayer model has seen extensive adoption within soil science and related fields. In general, existing studies either support the concept of a patchy distribution of adsorbed OM on mineral surfaces or advocate that OM can be coprecipitated with nanosized poorly crystalline minerals or hydrolysable metals. However, the evidence for the patchy distribution of adsorbed OM cannot support the multilayer model on its own. There is little consensus about the role of N-rich OM in forming the contact zone according to the multilayer model but surface conditioning by different classes of organic compounds appears to be an essential factor for the overall adsorption of OM. Nevertheless, large uncertainty still remains with respect to multilayer-like organization of MOA. By taking advantage of recent developments in surface analytical sciences and computational chemistry, a rigid experimental testing of the multilayer model at the molecular level is still required and awaits to be integrated into improved concepts of MOA formation and OM stabilization.

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“…The close correlation between the extent of coverage by bacterial cell envelope fragments (containing aminosugars, proteins, and lipids) and CA 23 along with the findings of Achtenhagen et al . that water- and salt-stressed bacteria on mineral surfaces exhibit increased CA 24 suggested an impact of bacterial necromass on particle wetting properties.…”

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confidence: 99%

Soil wettability can be explained by the chemical composition of particle interfaces - An XPS study

Woche

Goebel

Mikutta

et al. 2017

Sci Rep

Self Cite

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Soil wettability (quantified in terms of contact angle, CA) is crucial for physical, chemical, and biological soil functioning. As the CA is determined by components present within the outmost nanometer of particles, this study applied X-ray photoelectron spectroscopy (XPS) with a maximum analysis depth of 10 nm to test the relationship between CA and surface elemental composition, using soil samples from a chronosequence where CA increased from 0° (0 yrs) to about 98° (120 yrs). Concurrently, as seen by XPS, C and N content increased and the content of O and the mineral-derived cations (Si, Al, K, Na, Ca, Mg, Fe) decreased. The C content was positively correlated with CA and least squares fitting indicated increasing amounts of non-polar C species with soil age. The contents of O and the mineral-derived cations were negatively correlated with CA, suggesting an increasing organic coating of the minerals that progressively masked the underlying mineral phase. The atomic O/C ratio was found to show a close negative relationship with CA, which applied as well to further sample sets of different texture and origin. This suggests the surface O/C ratio to be a general parameter linking surface wettability and surface elemental composition.

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Bacterial impact on the wetting properties of soil minerals

Cited by 21 publications

References 57 publications

Compared impact of compost and digestate on priming effect and hydrophobicity of soils depending on textural composition

Compared impact of compost and digestate on priming effect and hydrophobicity of soils depending on textural composition

The multilayer model of soil mineral–organic interfaces—a review

Soil wettability can be explained by the chemical composition of particle interfaces - An XPS study

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