Water-stable aggregates, glomalin-related soil protein, and carbohydrates in a chronosequence of sandy hydromorphic soils

Spohn, Marie; Giani, Luise

doi:10.1016/j.soilbio.2010.05.015

Cited by 119 publications

(48 citation statements)

References 31 publications

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“…Higher concentrations of both glomalin types are also generally observed in soils after the addition of various other organic sources, such as manure, crop stubble, or compost (Curaqueo et al, 2011;Curaqueo et al, 2014;Valarini et al, 2009), but the concentration of glomalin is also affected by soil management (Curaqueo et al, 2011) Bulk density in soils decreased with higher BC doses, in contrast to the findings of previous 2006; Curaqueo et al, 2010;Curaqueo et al, 2011). Positive correlations between organic C, glomalin fractions and physical soil properties were found, consistent with the results of other studies (Curaqueo et al, 2010;Curaqueo et al, 2011;Spohn and Giani, 2010). This consistency confirms the role played by glomalin as a soilaggregating agent.…”

Section: Discussionsupporting

confidence: 86%

“…Both the particle size distribution and MWD in the Inceptisol increased with the OBC doses; however, in the Ultisol, MWD increased consistently, whereas the particle size distribution did not. The influence of OBC on aggregate stability and the particle size distribution could be related to the soil organic matter content as well as to other aggregation agents, such as glomalin fractions and/ or carbohydrates (Curaqueo et al, 2011;Spohn and Giani, 2010). Plowing breaks up larger and unstable aggregates and results in a smaller MWD.…”

Section: Relationship Among Observed Parametersmentioning

confidence: 99%

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Use of biochar on two volcanic soils: effects on soil properties and barley yield

Curaqueo

Meier

Khan

et al. 2014

J. Soil Sci. Plant Nutr.

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The use of biochar in agricultural soils appears to be promising because it is known to improve soil properties and increase crop production. However, few studies have been conducted with biochar on volcanic soils. Two field experiments were conducted simultaneously to evaluate the effect of oat hull biochar (OBC) on various physical-chemical properties of two volcanic soils, an 'Inceptisol' and an 'Ultisol', and to evaluate the resulting effects on the yields of barley (Hordeum vulgare) grown on these soils. The OBC doses applied to field microplots were equivalent to 0, 5, 10 and 20 Mg ha -1 . The results showed that pH, total exchangeable bases, and electrical conductivity increased at the highest dose of OBC in both soils. Glomalin-related soil protein (GRSP) was significantly high in the Ultisol at a rate of 20 Mg OBC ha -1 . Water-stable aggregates (WSA) and mean weight diameter (MWD) were enhanced at the highest doses of OBC in both soils. However, water-holding capacity (WHC) only increased in the Ultisol when amended with OBC at rates of 10 and 20 Mg ha -1 . Barley yield (grain weight m -2 ) significantly increased at the highest OBC dose by 31.3% and 21.9% for crops grown on the Inceptisol and Ultisol, respectively. Significant relationships were observed between WHC and glomalin fractions (r = 0.81, p < 0.01 for easily extractable-GRSP and r = 0.62, p < 0.01 for Total-GRSP) as well as between organic C and WSA and both glomalin fractions. According to this study, biochar may be used effectively to improve the quality of these two volcanic soils and promote sustainable grain production.

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Section: Discussionsupporting

confidence: 86%

Section: Relationship Among Observed Parametersmentioning

confidence: 99%

Use of biochar on two volcanic soils: effects on soil properties and barley yield

Curaqueo

Meier

Khan

et al. 2014

J. Soil Sci. Plant Nutr.

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“…Humic substances are key components of soil aggregates, and, with complex carbohydrates synthesized by bacteria, they function together with clay fraction to form soil aggregates (Spohn and Giani 2010). Plant roots and their rhizosphere zone have many effects on soil aggregation with increasing root length density, microbial activity, and content of glomalin (Rillig et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Humic substances and aggregate stability in rhizospheric and non-rhizospheric soil

Kobierski

Kondratowicz-Maciejewska

Banach-Szott

et al. 2018

J Soils Sediments

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Purpose The paper describes rhizospheric (Rs) and non-rhizospheric (nRs) soil to demonstrate the zone of the plant root impact on physical and chemical properties of the soil. The effects of the process accompanying the transformations of organic matter into humic substances in the rhizosphere of Bcommon dandelion^Taraxacum officinale have been determined, and the properties of humic acids (HAs) were described. The importance of iron and clay minerals for the formation of a stable and water-resistant soil structure has been emphasized. Materials and methods The laboratory analysis involved determination of basic physical and chemical soil properties: texture, pH, cation exchange capacity (CEC), electrical conductivity, and content of total organic carbon (TOC) and dissolved organic carbon (DOC) and quality of humic substances: optical properties of HAs and its separation into hydrophilic (HIL) and hydrophobic (HOB) fractions, speciation of iron, glomalin operationally described as an easily extractable glomalin-related soil protein (EE-GRSP), and soil aggregate stability (SAS) of six size classes of soil aggregates. Results and discussion The Rs was reported with a higher TOC and DOC content (measured in the CaCl 2 extracts), however not significantly. The HAs isolated from Rs revealed a significantly higher content of humic substances at its initial decomposition stage, as compared with nRs. A significantly higher concentration of EE-GRSP was noted in the aggregates of the rhizospheric zone (mean 1.14 g kg −1 ) than in the aggregates collected from root-free soil (mean 0.94 g kg −1 ). There was noted the highest mean share of 1-3 mm soil aggregates in Rs as well as in nRs, respectively 44.4 and 38.3%. The soil material both in Rs and in nRs contained high amounts of exchangeable Ca 2+ , and smectite is the predominant clay mineral. It was favorable for the accumulation of organic carbon and for the formation of good soil physical condition (tilth). Higher but insignificant SAS values were observed for Rs (mean SAS = 95.6%) than for nRs (mean SAS = 93.9%). Conclusions The studies confirm the role of common dandelion roots in the process of organic carbon accumulation in rhizospheric zone and a favorable effect on the mechanism of the formation of water-resistant aggregates. Higher values of SAS for the Rs were affected by the content of TOC, DOC, exchangeable Ca 2+ and the concentration of EE-GRSP, and, less considerably, the content of Fe and clay minerals.

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“…These plants co-evolved with grazing mammals which induced a genetic capacity to produce secondary roots and to resist to grazing pressure. These plants are able to feed microorganisms with root exudates during pedo-climatic favourable periods, generating particular, very functional organic-mineral soil aggregates (Blankinship et al, 2016;Nasto et al, 2014;Spohn and Giani, 2010). As a consequence, soil carbon storage and water capacity increase (Meier et al, 2017;Six et al, 2004).…”

Section: Subtropical-equatorial Agro Humipedonsmentioning

confidence: 99%

“…Anecic and endogeic earthworms may be numerous in such humipedons. They form more efficacious organic-mineral aggregates than arthropods (Bertrand et al, 2015;Spohn and Giani, 2010). Anecic and endogeic dropping correspond to well amalgamated organic-mineral aggregated resisting to a fast biodegradation, preventing lixiviation and eluviation of minerals, avoiding soil erosion.…”

Section: Subtropical-equatorial Agro Humipedonsmentioning

confidence: 99%

Humusica 2, article 18: Techno humus systems and global change – Greenhouse effect, soil and agriculture

Zanella

Ponge

Hager

et al. 2018

Applied Soil Ecology

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A B S T R A C TThe article is structured in six sections. A first portion is dedicated to the state of the art concerning climatic change and agriculture. Internet available IPCC maps and cartographic documents made by scientific Centres of research were used for illustrating forecasted climatic changes. In Sections 2 and 3, bibliographic evidences were collected for supporting a vegetation and soil co-evolution theory. Humus, soil and vegetation systems are presented at planet level in many synthetic maps. In Sections 4, 5 and 6 the authors discussed the human influence on the soil evolution during the Anthropocene. It appears that humans detected and used the Mull humus systems all over planet Earth for crop production and pasture. Human pressure impoverished these humus systems, which tend to evolve toward Amphi or Moder systems, losing their natural biostructure and carbon content.

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Water-stable aggregates, glomalin-related soil protein, and carbohydrates in a chronosequence of sandy hydromorphic soils

Cited by 119 publications

References 31 publications

Use of biochar on two volcanic soils: effects on soil properties and barley yield

Use of biochar on two volcanic soils: effects on soil properties and barley yield

Humic substances and aggregate stability in rhizospheric and non-rhizospheric soil

Humusica 2, article 18: Techno humus systems and global change – Greenhouse effect, soil and agriculture

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