New insights into organic carbon stabilization in soil macroaggregates: An in situ study by optical microscopy and SEM-EDS technique

Guidi, Patrizia; Falsone, Gloria; Wilson, Clare; Cavani, Luciano; Ciavatta, Claudio; Marzadori, Claudio

doi:10.1016/j.geoderma.2021.115101

Cited by 21 publications

(8 citation statements)

References 49 publications

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“…Combining its two illumination modes: plane‐polarized light and cross‐polarized light, pores are able to be distinguished from mineral particles, that is, quartz in images (Stoops, 2020). Therefore, in addition to the basic structural information of particles mentioned above, its application on thin sections of undisturbed soils and/or isolated aggregates could provide information on inter‐aggregate and intra‐aggregate pores (Guidi et al., 2021; Papadopoulos et al., 2009). However, the minimum size for pore detection is usually set at 100 µm 2 (Guidi et al., 2021; Papadopoulos et al., 2009), which appears not to be optimized for detecting intra pores of microaggregates.…”

Section: Analyses Of Individual Aggregatesmentioning

confidence: 99%

Architecture of soil microaggregates: Advanced methodologies to explore properties and functions

Amelung,

Tang,

Siebers

et al. 2023

J. Plant Nutr. Soil Sci.

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The functions of soils are intimately linked to their three‐dimensional pore space and the associated biogeochemical interfaces, mirrored in the complex structure that developed during pedogenesis. Under stress overload, soil disintegrates into smaller compound structures, conventionally named aggregates. Microaggregates (<250 µm) are recognized as the most stable soil structural units. They are built of mineral, organic, and biotic materials, provide habitats for a vast diversity of microorganisms, and are closely involved in the cycling of matter and energy. However, exploring the architecture of soil microaggregates and their linkage to soil functions remains a challenging but demanding scientific endeavor. With the advent of complementary spectromicroscopic and tomographic techniques, we can now assess and visualize the size, composition, and porosity of microaggregates and the spatial arrangement of their interior building units. Their combinations with advanced experimental pedology, multi‐isotope labeling experiments, and computational approaches pave the way to investigate microaggregate turnover and stability, explore their role in element cycling, and unravel the intricate linkage between structure and function. However, spectromicroscopic techniques operate at different scales and resolutions, and have specific requirements for sample preparation and microaggregate isolation; hence, special attention must be paid to both the separation of microaggregates in a reproducible manner and the synopsis of the geography of information that originates from the diverse complementary instrumental techniques. The latter calls for further development of strategies for synlocation and synscaling beyond the present state of correlative analysis. Here, we present examples of recent scientific progress and review both options and challenges of the joint application of cutting‐edge techniques to achieve a sophisticated picture of the properties and functions of soil microaggregates.

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Section: Analyses Of Individual Aggregatesmentioning

confidence: 99%

Architecture of soil microaggregates: Advanced methodologies to explore properties and functions

Amelung,

Tang,

Siebers

et al. 2023

J. Plant Nutr. Soil Sci.

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“…Studies on the particle size fractions by Fourier transform infrared spectroscopy (FTIR) indicated that addition of maize/wheat residues enriched the alkyl‐C moiety (hydrophobicity) in anaerobic soils, but the O‐alkyl‐C moiety (hydrophilicity) in aerobic soils (Chen, Xu, et al, 2018; Gao et al, 2016). Associations between organics and minerals (e.g., kaolinite, smectite, oxides of Fe/Mn, and carbonate) increase the stability of SOC upon straw amendment, as they can form organo–mineral complexes observed by scanning electron microscopy coupled with energy dispersive spectroscopy (SEM‐EDS) (Guidi et al, 2021; Kramer et al, 2012; Wilson et al, 2013; Xue et al, 2019). These suggest that spectroscopic analysis techniques such as FTIR and SEM‐EDS are valuable for identifying the composition of soil organic groups and organo–mineral associations under ASD.…”

Section: Introductionmentioning

confidence: 99%

“…Associations between organics and minerals (e.g., kaolinite, smectite, oxides of Fe/Mn, and carbonate) increase the stability of SOC upon straw amendment, as they can form organo-mineral complexes observed by scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) (Guidi et al, 2021;Kramer et al, 2012;Wilson et al, 2013;Xue et al, 2019). These suggest that spectroscopic analysis techniques such as FTIR and SEM-EDS are valuable for identifying the composition of soil organic groups and organo-mineral associations under ASD.…”

mentioning

confidence: 99%

Short‐term responses of soil organic carbon and chemical composition of particle‐associated organic carbon to anaerobic soil disinfestation in degraded greenhouse soils

Chen

Zhang

et al. 2023

Land Degrad Dev

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Anaerobic soil disinfestation (ASD) is a short‐term practice to conquer soil degradation, yet its effects on soil organic carbon (SOC) and its composition remain unclear. A field experiment was conducted in degraded greenhouse soils (C3) that were previously used for production of vegetable (VP) and flower (FP), with three treatments (i.e., control, ST [maize straw addition [C4]] and ASD [both ST and water flooding]) for 21 days. Results indicated that the control soil lost 1.3 Mg C ha−1 in VP and 0.94 Mg C ha−1 in FP, while ST increased SOC storage by over 1.0 Mg C ha−1 in both VP and FP. The ASD increased SOC storage by over 2.0 Mg C ha−1 by forming new SOC and decreasing old SOC loss. Additionally, ASD increased OC concentration in particulate size fractions, particularly in particulate organic matter (POM) with lower basal respiration, and higher hydrophobicity as indicated by an increased ratio of C–H/C=O from POM observed by FTIR. The SEM‐EDS found an enhanced C signal in particle size fractions, especially in POM. Overlap of C, O, Si, Ca, and Fe in mineral‐associated organic matter upon ASD indicated the possible crosslinking between intra‐OC and minerals containing O, Si, Ca, and Fe. The ASD also controlled soil salinization and the pathogen Fusarium oxysporum, resulting in increased tomato yields in both VP and FP. Overall, apart from increasing tomato yields, ASD can enhance SOC storage by increasing OC in particle size fractions within a short term.

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“…13 This was the same as other studies on the addition of biochar and polyacrylic acid as GR substrate modifiers, making use of their carbon sequestration for organic matter enrichment and strengthening the soil cohesion force. [14][15][16][17][18] They can act as agglomerates among the substrate particles, as 'artificial humus', improve the physical and chemical properties and accelerate the formation of AS in the substrate layer. 9,[19][20][21] Polyaluminium chloride (PAC) and bentonite, as an inorganic polymer and a clay mineral, respectively, have similar characteristics of high viscosity and agglomeration ability among the various substrate particles.…”

Section: Introductionmentioning

confidence: 99%

Improvement in pollutant controlling performance by modified aggregate structure in extensive green roof substrate layer

Zhang

et al. 2022

Environ. Sci.: Water Res. Technol.

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New insights into organic carbon stabilization in soil macroaggregates: An in situ study by optical microscopy and SEM-EDS technique

Cited by 21 publications

References 49 publications

Architecture of soil microaggregates: Advanced methodologies to explore properties and functions

Architecture of soil microaggregates: Advanced methodologies to explore properties and functions

Short‐term responses of soil organic carbon and chemical composition of particle‐associated organic carbon to anaerobic soil disinfestation in degraded greenhouse soils

Improvement in pollutant controlling performance by modified aggregate structure in extensive green roof substrate layer

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