Synergistic relationships between the age of soil organic matter, Fe speciation, and aggregate stability in an arable Luvisol

Siebers, Nina; Voggenreiter, Eva; Joshi, Prachi; Rethemeyer, Janet; Wang, Liming

doi:10.1002/jpln.202300020

Cited by 8 publications

(7 citation statements)

References 81 publications

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“…A recent study using the slightly modified approach of Mason et al (2011) found that bare fallow led to the destabilization and disintegration of 53-250 μm soil microaggregates into smaller ones (20-53 μm). This is confirmed by a significantly increased mass of small soil microaggregates compared with a cropped control plot and a significantly decreased median diameter as identified by continuous LD measurements (Siebers et al, 2024).…”

Section: Size Analyses Of Microaggregates and Finer Particlesmentioning

confidence: 61%

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: Size Analyses Of Microaggregates and Finer Particlesmentioning

confidence: 61%

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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“…As emphasized by Clarholm & Skyllberg (2013), the presence of EPS and microorganisms plays a pivotal role in the initial formation of aggregates owing to their adhesive properties. Nevertheless, when organic matter becomes depleted or in conditions of sterilization, aggregates may disintegrate due to the loss of the organic "glue" that binds them together (Siebers et al, 2023). This disintegration can lead to the emergence of smaller particles or aggregates that exhibit higher stability, primarily driven by the increased prevalence of abiotic components such as clay minerals and oxides.…”

Section: Discussionmentioning

confidence: 99%

“…The determination of soil stability was performed with the same particle analyzer following the method described by others (Kowalenko & Babuin, 2013;Mason et al, 2011;Siebers et al, 2023). For this, while being agitated and circulated aggregates were exposed to a steady and continuous mechanical force, the stability of aggregates was determined by conducting repeated measurements of the particle size distribution over a period of 40 min.…”

Section: Particle-size Distribution and Stabilitymentioning

confidence: 99%

Interactive effects of mucilage and drying and wetting cycles on rhizosheath development

Rahim,

Amelung,

Siebers

2023

Preprint

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Aims: Mucilage is vital for rhizosheath formation, the soil adhering to plant roots after gentle shaking. We hypothesized that alternating drying-wetting cycles affect mucilage's role in rhizosheath development and soil aggregation within the rhizosphere. To explore this, we employed flax cord as an artificial root model, subjecting it to soils with varying clay contents (22% and 32%), both sterilized and unsterilized. Methods: We moistened the model roots with 0.12 g of dry chia seed mucilage per g of water and incubated them under controlled conditions. Soil moisture levels were maintained at 75% of water holding capacity (reference) & subjected to five dry-wet (DW) cycles, mimicking wet-dry fluctuations. Control experiments omitted mucilage addition. Subsequently, we isolated the rhizosheath through gentle shaking and analyzed surrounding soil particle-size distribution and aggregate properties using laser diffraction and scanning electron microscopy (SEM). Results: Mucilage presence doubled the rhizosheath quantity compared to mucilage-free soil. Remarkably, constant wet conditions had an even more pronounced impact, significantly enhancing rhizosheath development, particularly in unsterilized soil with 22% clay. Conversely, DW cycles led to a notable reduction in rhizosheath compared to the wet treatment, likely due to physical interactions affecting rhizosheath formation. Notably, there were minimal treatment effects on particle aggregation outside the rhizosheath, with an average diameter of < 10 µm and limited influence from the water regime. Conclusions: We conclude that water regime emerged as the key factor influencing mucilage's contribution to rhizosheath formation, while clay content and microbial activity played minor roles in this laboratory-based experiment.

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“…Across the rock fragment gradient, the C content in fine MOM fractions increased with decreasing FE content, which indicates a more concentrated C storage in the soils with higher rock content (Figure 3c). A study at the medium-FE soil, showed that the post-modern 14 C content decreased under bare fallow, which indicates older OM on average, compared to the cropped sites (Siebers et al, 2024).…”

Section: Bare Fallow Management Affects Om Fractions Depending On Roc...mentioning

confidence: 97%

Impact of bare fallow management on soil carbon storage and aggregates across a rock fragment gradient

Schweizer,

Aehnelt,

Bucka

et al. 2024

J. Plant Nutr. Soil Sci.

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BackgroundOur understanding of C storage in soils lacks insights investigating organic matter (OM) depletion, often studied in bare fallow systems. The content of coarse rock fragments is often excluded, whereas it may affect C storage.AimsWe aim to contribute to a better understanding of the impact of bare fallow on C storage mechanisms in the soil as influenced by its coarse rock fragment contents. We investigated whether bare fallow induced a depletion of C in OM fractions and analyzed to which extent this affected soil aggregate size distribution and the C loading of the clay‐sized fraction.MethodsA comparison of 14 years bare fallow management with adjacent cropped soils located in Selhausen (Germany) provided a gradient of coarse rock fragments of 34%–71%, from which sites with three different fine earth (FE) contents were compared. Across the FE gradient, we isolated particulate OM and mineral‐associated OM fractions, obtained microaggregate and macroaggregate size fractions, and quantified the C loading.ResultsBare fallow management induced an OM depletion at lower contents of FE. There, the management influence was more concentrated onto less FE volume. The contribution of both particulate and mineral‐associated OM fractions to the C in the low‐FE soils decreased. The C loading increased under bare fallow, compared to cropped soil. In the low‐FE soil, we also found less macroaggregates, whereas the C content decreased in some microaggregate size fractions.ConclusionsA high content of coarse rock fragments can enhance OM depletion decreasing mineral‐associated and particulate C under bare fallow.

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Synergistic relationships between the age of soil organic matter, Fe speciation, and aggregate stability in an arable Luvisol

Cited by 8 publications

References 81 publications

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

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

Interactive effects of mucilage and drying and wetting cycles on rhizosheath development

Impact of bare fallow management on soil carbon storage and aggregates across a rock fragment gradient

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