Burn Effects on Soil Aggregate Stability and Water Repellency of Two Soil Types from East and North Tunisia

Ibrahimi, Khaled; Mowrer, Jake; Amami, Roua; Belaid, Abdelhamid

doi:10.1080/00103624.2019.1589487

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…These can be (as reviewed by Kaiser et al, 2015)) the formation of new interactions between minerals and OM, the killing of microorganisms and shifts in their community structure and an increase of mineral surface acidity and hydrophobicity (possibly affecting aggregate stability; cf. Ibrahimi, Mowrer, Amami, and Belaid, 2019)). The degree to which these characteristics are altered by wetting and drying depends on various factors, such as soil depth (Kaiser et al, 2015), land use (Fierer & Schimel, 2003), texture and OM content (Albalasmeh & Ghezzehei, 2014), sodium and calcium cation configuration (Aquino et al, 2011), pH value (Kang & Xing, 2008) and drying speed (Kemper & Rosenau, 1986).…”

Section: Discussionmentioning

confidence: 99%

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

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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.

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Section: Discussionmentioning

confidence: 99%

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

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“…These can be (as reviewed by Kaiser et al (2015)) the formation of new interactions between minerals and OM, the killing of microorganisms and shifts in their community structure and an increase of mineral surface acidity and hydrophobicity (possibly affecting aggregate stability, cf. Ibrahimi et al (2019)). The degree to which these characteristics are altered by wetting and drying depends on various factors, like soil depth (Kaiser et al, 2015), land use (Fierer and Schimel, 2003), texture and OM content (Albalasmeh and Ghezzehei, 2014), sodium and calcium cation configuration (Aquino et al, 2011), pH value (Kang and Xing, 2008) and drying speed (Kemper and Rosenau, 1986).…”

Section: Microaggregate Structure As Observed With Microscopy and Tom...mentioning

confidence: 99%

Clay content modulates differences in bacterial community structure in soil aggregates of different size

et al. 2020

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“…The PR values of the surface layer (0-5 cm) were computed as weighted depth averages. Water-stable aggregates were estimated using the fast-wetting test (Le Bissonnais 1996) as described in Ibrahimi et al (2019). The mean weight diameter (MWD) of water-stable aggregates was computed by totaling the products of aggregate fraction weight and mean diameter of aggregate classes as follows:…”

Section: Soil Analysesmentioning

confidence: 99%

Effects of conservation and standard tillage on soil physico-chemical properties and overall quality in a semi-arid agrosystem

et al. 2021

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Context Shifting agricultural operations to more sustainable management practices is needed in the face of a changing climate. Aims In this study, the short-term effects of three tillage systems (no tillage, minimum tillage and conventional tillage) on a wide selection of soil properties in a semi-arid agrosystem of eastern Tunisia were assessed. Methods The studied soil properties included saturation percentage, bulk density, penetration resistance, mean weight diameter, electric conductivity, soil reaction, soil organic matter, carbonates, available phosphorus and exchangeable potassium. The impacts of tillage systems on soil quality indices (SQI) developed based on the total set of properties (SQI-T), or a minimum set (SQI-M) selected through principal component analysis, were also investigated. Key results Relative to conventional tillage, no tillage increased bulk density, penetration resistance and electrical conductivity, whereas minimum tillage affected only saturation percentage and pH. No tillage and minimum tillage did not enhance soil quality relative to conventional tillage. The SQI-T and SQI-M were highly correlated (r = 0.93) to each other suggesting that the outcomes of the two indices are comparable. Principal component analysis efficiently selected the most influential indicators of the effects of tillage systems on soil quality. Conclusions and implications Farmers in the study region are encouraged to consider minimum tillage during the early years of transition from standard to no tillage systems to avoid rapid decline in soil quality and consequent yield loss.

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Burn Effects on Soil Aggregate Stability and Water Repellency of Two Soil Types from East and North Tunisia

Cited by 10 publications

References 37 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

Clay content modulates differences in bacterial community structure in soil aggregates of different size

Effects of conservation and standard tillage on soil physico-chemical properties and overall quality in a semi-arid agrosystem

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