Microaggregate stability and storage of organic carbon is affected by clay content in arable Luvisols

Krause, Lars; Rodionov, Andrei; Schweizer, Steffen A.; Siebers, Nina; Lehndorff, Eva; Klumpp, Erwin; Amelung, Wulf

doi:10.1016/j.still.2018.05.003

Cited by 55 publications

(51 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Means with the same letter in the same isolation method and size fractions were not significantly different. Data of the wet‐sieved free and wet‐sieved occluded fractions adapted from Krause et al (2018) [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Samples were taken at clay contents of 19, 24 and 34% ( n = 5 each). More detailed information on the sampling of the toposequence can be found in Krause et al (2018). Briefly, the top 5–20 cm were sampled in late 2015 in a field‐fresh state (water content approximately 16 wt% or 21 vol.%), sieved to <8 mm and stored at 4°C until further processing.…”

Section: Methodsmentioning

confidence: 99%

“…The isolation of aggregates using wet sieving was carried out according to Krause et al (2018). Briefly, the pre‐wetted field‐fresh aggregates were isolated on a sieve tower under constant shaking (Kösters, Preger, Du Preez, & Amelung, 2013).…”

Section: Methodsmentioning

confidence: 99%

“…Especially fine mineral soil particles can affect the surface adsorption of OM and formation of microaggregates through organo‐mineral associations (Baldock & Skjemstad, 2000; Wagner, Cattle, & Scholten, 2007). Clay content is positively correlated with aggregate tensile strength (Imhoff, da Silva, & Dexter, 2002; Kavdir, Özcan, Ekinci, Yigini, & Yüksel, 2004; Kay & Dexter, 1992) and was found to stabilize larger aggregate structures that drive the arrangement and the distribution of OM in aggregate fractions (Dexter et al, 2008; Krause et al, 2018; Schjønning et al, 2012; Schweizer, Bucka, Graf‐Rosenfellner, & Kögel‐Knabner, 2019). Because larger primary particles do not play a dominant role in OM storage inside soil aggregates, our current conception of aggregate structures has mostly focused on structures that are comprised of many fine particles.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Wet sieving versus dry crushing: Soil microaggregates reveal different physical structure, bacterial diversity and organic matter composition in a clay gradient

Felde

Schweizer

Biesgen

et al. 2020

European J Soil Science

Self Cite

View full text Add to dashboard Cite

Soil microaggregates contain particles of different sizes, which may affect their potential to store organic carbon (OC). A variety of methods can be used to isolate microaggregates from the larger soil structures, among which wet sieving approaches are widely employed. We developed a novel dry crushing method that isolates microaggregates along failure planes due to mechanical stresses rather than hydraulic pressures and compared the mechanical stability, OC contents and microbial community composition between dry‐crushed and wet‐sieved samples with contrasting clay contents. Dry‐crushed samples exhibited a higher stability and bacterial diversity compared to wet‐sieved samples. As a result, the dry‐crushed microaggregates had different size distributions when analysed dry and after wetting. In the dry state, dry‐crushed microaggregates were larger and contained more sand‐sized primary particles within the aggregate structures. The wetting of dry‐crushed aggregates caused a disintegration of larger microaggregates and sand‐sized primary particles into smaller microaggregates that contained finer particles. In the soils with lower clay contents, the diameter of dry‐crushed microaggregates was 40 μm larger due to more sand‐sized primary particles remaining within the aggregates. Depending on how much volume in microaggregates is occupied by large primary particles, the OC concentration increased in the soil with higher clay content. Wet‐sieved size fractions also showed a similar pattern of OC distribution, whereas more primary particles were observed outside of aggregates. Wet sieving approaches disperse the soil into OC‐rich aggregates and might be preferable if OC dynamics are investigated. Differences in bacterial community composition in dependence on clay content were more pronounced in dry‐crushed microaggregates. If intact aggregate architectures are of interest for the isolation of soil structural units, the presented dry crushing method might provide an advantageous alternative that also better preserves bacterial diversity.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wet sieving versus dry crushing: Soil microaggregates reveal different physical structure, bacterial diversity and organic matter composition in a clay gradient

Felde

Schweizer

Biesgen

et al. 2020

European J Soil Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…The results showed that the site with the highest clay content of 29% (Tänikon) required a stronger dispersion with ultrasonication than the other sites to achieve fractions with better isolation of C3-and C4-derived organic carbon. Clay particles tend to form very stable microaggregates (52)(53)(54) and increase the proportion of macro-aggregates in the soil (54,55). These macroaggregates obviously resisted weaker dispersion methods with H 2 O and glass beads (19, 31).…”

Section: Discussion Isolation Efficiencies Of Dispersion Methods Are Related To Soil Texturementioning

confidence: 99%

A Simple Approach to Isolate Slow and Fast Cycling Organic Carbon Fractions in Central European Soils—Importance of Dispersion Method

et al. 2021

View full text Add to dashboard Cite

Numerous approaches have been developed to isolate fast and slow cycling soil organic carbon (SOC) pools using physical and chemical fractionation. Most of these methods are complex, expensive, and time consuming and unsuited for high-throughput application, such as for regional scale assessments. For simpler and faster fractionation via particle size the key issue is the dispersion of soil. It is unclear how the initial dispersion of soil affects the turnover rates of isolated fractions. We investigated five commonly used dispersion methods using different intensities: shaking in water, shaking in water with glass beads, ultrasonication at 100 and 450 J ml−1 and sodium hexametaphosphate (Na-HMP). We used soils from long-term field experiments that included a change from C3 to C4 vegetation and adjacent control sites using δ13C isotope ratio mass spectrometry. We evaluated the degree of C3/C4 moieties of the fractions, mass and carbon recovery and reproducibility as well as the time expenditures of the dispersions, sieving and drying techniques to develop an efficient and cheap fractionation method. Our results indicate that ultrasonication as well as H2O treatment with and without glass beads resulted in fractions with different turnover. Moreover, isolation performances depended on soil texture. While the isolation of the fractions using water with and without glass beads was equivalent to ultrasonication in soils with low clay contents, these methods had limited potential for soils with high clay contents. Furthermore, treatment with water alone had less reproducible results than other tested methods. The SOC recovery was comparable and satisfactory amongst non-chemical dispersion methods and reached over 95% for each of these methods. The use of Na-HMP was unsuccessful due to high time expenditures and strong SOC leaching. We propose particle size fractionation combined with ultrasonic dispersion as a fast and highly reliable method to quantify slow and fast cycling SOC pools for a wide range of soil types and textures from agricultural sites in central Europe.

show abstract

Plant Roots for Sustainable Soil Structure Management in Cropping Systems

Bodner

Mentler

Keiblinger

2021

The Root Systems in Sustainable Agricultural Intensification

View full text Add to dashboard Cite

Microaggregate stability and storage of organic carbon is affected by clay content in arable Luvisols

Cited by 55 publications

References 49 publications

Wet sieving versus dry crushing: Soil microaggregates reveal different physical structure, bacterial diversity and organic matter composition in a clay gradient

Wet sieving versus dry crushing: Soil microaggregates reveal different physical structure, bacterial diversity and organic matter composition in a clay gradient

A Simple Approach to Isolate Slow and Fast Cycling Organic Carbon Fractions in Central European Soils—Importance of Dispersion Method

Plant Roots for Sustainable Soil Structure Management in Cropping Systems

Contact Info

Product

Resources

About