A conceptual model of organo-mineral interactions in soils: self-assembly of organic molecular fragments into zonal structures on mineral surfaces

Kleber, Markus; Sollins, Phillip; Sutton, Rebecca

doi:10.1007/s10533-007-9103-5

Cited by 992 publications

(839 citation statements)

References 106 publications

(127 reference statements)

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“…In this context, it is worth noting that Kleber et al (2007) found INA protein complexes to be well preserved -and maybe accumulated -when being connected to mineral surfaces. Also Conen et al (2011) found that organic matter consisting of remains of micro-organisms that took part in the degradation of plant debris is responsible for enhancing the ice nucleation of atmospheric mineral dust.…”

Section: Discussionmentioning

confidence: 91%

Immersion freezing of ice nucleation active protein complexes

et al. 2013

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Utilising the Leipzig Aerosol Cloud Interaction Simulator (LACIS), the immersion freezing behaviour of droplet ensembles containing monodisperse particles, generated from a Snomax™ solution/suspension, was investigated. Thereto ice fractions were measured in the temperature range between −5 °C to −38 °C. Snomax™ is an industrial product applied for artificial snow production and contains Pseudomonas syringae} bacteria which have long been used as model organism for atmospheric relevant ice nucleation active (INA) bacteria. The ice nucleation activity of such bacteria is controlled by INA protein complexes in their outer membrane.

In our experiments, ice fractions increased steeply in the temperature range from about −6 °C to about −10 °C and then levelled off at ice fractions smaller than one. The plateau implies that not all examined droplets contained an INA protein complex. Assuming the INA protein complexes to be Poisson distributed over the investigated droplet populations, we developed the CHESS model (stoCHastic modEl of similar and poiSSon distributed ice nuclei) which allows for the calculation of ice fractions as function of temperature and time for a given nucleation rate. Matching calculated and measured ice fractions, we determined and parameterised the nucleation rate of INA protein complexes exhibiting class III ice nucleation behaviour. Utilising the CHESS model, together with the determined nucleation rate, we compared predictions from the model to experimental data from the literature and found good agreement.

We found that (a) the heterogeneous ice nucleation rate expression quantifying the ice nucleation behaviour of the INA protein complex is capable of describing the ice nucleation behaviour observed in various experiments for both, Snomax™ and P. syringae bacteria, (b) the ice nucleation rate, and its temperature dependence, seem to be very similar regardless of whether the INA protein complexes inducing ice nucleation are attached to the outer membrane of intact bacteria or membrane fragments, (c) the temperature range in which heterogeneous droplet freezing occurs, and the fraction of droplets being able to freeze, both depend on the actual number of INA protein complexes present in the droplet ensemble, and (d) possible artifacts suspected to occur in connection with the drop freezing method, i.e., the method frequently used by biologist for quantifying ice nucleation behaviour, are of minor importance, at least for substances such as P. syringae, which induce freezing at comparably high temperatures. The last statement implies that for single ice nucleation entities such as INA protein complexes, it is the number of entities present in the droplet population, and the entities' nucleation rate, which control the freezing behaviour of the droplet population. Quantities such as ice active surface site density are not suitable in this context.

The results obtained in this study allow a different perspective on the quantification of the immersi...

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Section: Discussionmentioning

confidence: 91%

Immersion freezing of ice nucleation active protein complexes

et al. 2013

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“…The composition of plant tissues is a major factor influencing the process of their decomposition and soil carbon incorporation in temperate ecosystems (Kögel-Knabner 2002;Kleber et al 2007). The soil organic carbon may reside in more labile or stable organic matter according to the chemical composition and recalcitrance of plant residues (Berg & McClaugherty 2008).…”

Section: Introductionmentioning

confidence: 99%

Clay content drives carbon stocks in soils under a plantation of Eucalyptus saligna Labill. in southern Brazil

et al. 2014

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Soil carbon accumulation is largely dependent on net primary productivity. To our knowledge, there have been no studies investigating the dynamics of carbon accumulation in weathered subtropical soils, especially in managed eucalyptus plantations. We quantified the seasonal input of leaf litter, the leaf decomposition rate and soil carbon stocks in an commercial plantation of Eucalyptus saligna Labill. in southern Brazil. Our goal was to evaluate, through multiple linear regression, the influence that certain chemical characteristics of litter, as well as chemical and physical characteristics of soil, have on carbon accumulation in soil organic matter fractions. Variables related to the chemical composition of litter were not associated with the soil carbon stock in the particulate and mineral fractions. However, certain soil characteristics were significantly associated with the carbon stock in both fractions. The concentrations of nutrients associated with plant growth and productivity, such as phosphorus, sulfur, copper and zinc, were associated with variations in the labile carbon pool (particulate fraction). Clay content was strongly associated with the carbon stock in the mineral fraction. The carbon accumulation and stabilization in weathered subtropical Ultisol seems to be mainly associated with the intrinsic characteristics of the soil, particularly clay content, rather than with the quantity, chemical composition or decomposition rate of the litter.

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“…On the contrary, in FGS, at a higher stability of HA the carbon content in the aggregates is higher, too. Here the HS create bonds with clay minerals, they are not only adsorbed on their surfaces, but also can penetrate into clay interlayers (Kleber et al 2007). In FGS, aromatic carbon components are dominant in organic structures (Jindaluang et al 2013).…”

Section: Resultsmentioning

confidence: 99%

“…The fine frac-doi: 10.17221/31/2017-SWR tions (clay, silt) are in a positive correlation with total organic carbon (TOC) and the coarse fractions (sand) in a negative (Burke et al 1989;Bronson et al 2004). A significant part of clay minerals is in the linkage with a large amount of organic substances (Jastrow 1996), which can be stabilized through the adsorption on the mineral surfaces (Baldock & Skjemstad 2000), bridges of polyvalent cations (Muneer & Oades 1989), binding into the interlayers of clay minerals (Kleber et al 2007). The stabilization of SOM is mainly controlled by the organo-mineral association (Cai et al 2016) and the iron-oxides and hydroxides.…”

mentioning

confidence: 99%

Humus substances and soil aggregates in the soils with different texture

Tobiašová¹,

Barančíková²,

Gömöryová³

et al. 2018

Soil Water Res.

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Tobiašová E., Barančíková G., Gömöryová E., Dębska B., Banach-Szott M. (2018): Humus substances and soil aggregates in the soils with different texture. Soil & Water Res., 13: 44−50.Humus substances (HS) influence the incorporation of carbon into soil aggregates in many ways. In this study the influence of HS and their fractions in the soil on the proportions of carbon (total organic, labile, non-labile) in water-resistant macro-aggregates (WSA) and differences between the amount of carbon in WSA in coarsegrained (CGS) and fine-grained (FGS) soils with dependence on the proportions of HS in the soil were determined. The experiment included three soils (Haplic Chernozem, Haplic Luvisol, Eutric Cambisol), each of them with two different soil textures (CGS, FGS) from four ecosystems (forest, meadow, urban, and agro-ecosystem). In CGS, higher proportions (52 and 50%) of smaller (< 1 mm) dry-sieved macro-aggregates (DSA) and also WSA were determined, while in FGS, higher proportions (51 and 53%) of larger DSA (> 7 mm) and WSA (> 2 mm) were detected. A negative correlation was recorded between the content of organic carbon in the fractions of WSA and the amount of extracted humic acids (HA) in CGS, and fulvic acids (FA) in FGS. In CGS, the correlation between the carbon content in WSA and HA bound with Ca 2+ and Mg 2+ , which forms humates (HA2), was negative. In FGS, a negative correlation was recorded between the carbon content in WSA and free aggressive FA (FA1a) and free FA and those, which are bound with monovalent cations and mobile R 2 O 3 (FA1) in the soil. In the case of FA1a, a negative correlation was recorded in FGS and also in CGS, however this influence was more marked in CGS than in FGS (by about 21% higher correlation). In CGS, the influence of HA and FA in soil on the content of labile carbon in aggregates was stronger than in FGS. In CGS, a higher proportion of carbon in aggregates was detected in the case of lower stability of HS and HA and, on the contrary, in FGS, a higher content of carbon in aggregates was detected in the case of their higher stability.

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A conceptual model of organo-mineral interactions in soils: self-assembly of organic molecular fragments into zonal structures on mineral surfaces

Cited by 992 publications

References 106 publications

Immersion freezing of ice nucleation active protein complexes

Immersion freezing of ice nucleation active protein complexes

Clay content drives carbon stocks in soils under a plantation of Eucalyptus saligna Labill. in southern Brazil

Humus substances and soil aggregates in the soils with different texture

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