The Impact of Clay Minerals on Soil Hydrological Processes

Gomboš, Milan

doi:10.5772/47748

Cited by 2 publications

(4 citation statements)

References 14 publications

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“…Indeed, at the experimental site the dynamics of continuous macropores in the clay soil can be strongly affected by cracks formations during the spring and summer periods, as generally reported for clay soils of Mediterranean regions [80]. One main characteristic of clay soils is, in fact, their capacity to change their volume, through swelling and shrinking processes which induce the formation of cracks in the horizontal plane and turn the soil into a two-domain structure: cracks (macropores) and soil matrix (containing micropores), characterised by different conditions of water transport and retention affecting the dynamics of soil hydrological processes [79]. The shrinking of the soil at decreasing water content produces a very heterogeneous network of macropores [79,80].…”

Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 74%

“…Furthermore, the limiting value of WFPS for bacterial denitrification can show marked variations depending on the soil texture, with a decrease of the required critical WFPS (and the subsequent degree of saturation) in finer textured soil than in coarser textured soil [12,77]. Additionally, not always the empirical WFPS term is able to normalize the water regimes of intact soil cores for different soil types, especially in the presence of shrinkage cracks [16,78,79]. Indeed, at the experimental site the dynamics of continuous macropores in the clay soil can be strongly affected by cracks formations during the spring and summer periods, as generally reported for clay soils of Mediterranean regions [80].…”

Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 99%

“…One main characteristic of clay soils is, in fact, their capacity to change their volume, through swelling and shrinking processes which induce the formation of cracks in the horizontal plane and turn the soil into a two-domain structure: cracks (macropores) and soil matrix (containing micropores), characterised by different conditions of water transport and retention affecting the dynamics of soil hydrological processes [79]. The shrinking of the soil at decreasing water content produces a very heterogeneous network of macropores [79,80]. This might allow, during rainfall or irrigation, a quicker and wider water infiltration towards the anaerobic denitrifying microsites (with high intra-aggregated WFPS), which could therefore become very active at relatively low total WFPS.…”

Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 99%

“…This might allow, during rainfall or irrigation, a quicker and wider water infiltration towards the anaerobic denitrifying microsites (with high intra-aggregated WFPS), which could therefore become very active at relatively low total WFPS. The volumetric changes are driven by the clay minerals content, which affects the geometry of crack network and the shrinkage characteristics [79]. In this regard, further research activities on the soil water regime and related issues, also including the mineralogical analysis of soil clays, could improve the understanding of key soil hydrological processes such as, water flow to cracks, water flow within cracks and water flow from cracks to soil matrix [79], in their turn affecting microbial metabolism and related GHG emissions.…”

Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 99%

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Denitrification Rate and Its Potential to Predict Biogenic N2O Field Emissions in a Mediterranean Maize-Cropped Soil in Southern Italy

Forte

Fierro

2019

Land

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The denitrification rate in C2H2-amended intact soil cores and soil N2O fluxes in closed static chambers were monitored in a Mediterranean irrigated maize-cropped field. The measurements were carried out during: (i) a standard fertilization management (SFM) activity and (ii) a manipulation experimental (ME) test on the effects of increased and reduced application rates of urea at the late fertilization. In the course of the SFM, the irrigations following early and late nitrogen fertilization led to pulses of denitrification rates (up to 1300 μg N2O-N m−2 h−1) and N2O fluxes (up to 320 μg N2O-N m−2 h−1), thanks to the combined action of high soil temperatures and not limiting nitrates and water filled pore space (WFPS). During the ME, high soil nitrates were noted in all the treatments in the first one month after the late fertilization, which promoted marked N-losses by microbial denitrification (from 500 to 1800 μg N2O-N m−2 h−1) every time the soil WFPS was not limiting. At similar maize yield responses to fertilizer treatments, this result suggested no competition for N between plant roots and soil microbial community and indicated a probable surplus of nitrogen fertilizer input at the investigated farm. Correlation and regression analyses (CRA) on the whole set of data showed significant relations between both the denitrification rates and the N2O fluxes with three soil physical-chemical parameters: nitrate concentration, WFPS and temperature. Specifically, the response functions of denitrification rate to soil nitrates, WFPS and temperature could be satisfactorily modelled according to simple Michaelis-Menten kinetic, exponential and linear functions, respectively. Furthermore, the CRA demonstrated a significant exponential relationship between N2O fluxes and denitrification and simple empirical functions to predict N2O emissions from the denitrification rate appeared more fitting (higher concordance correlation coefficient) than the predictive empirical algorithm based on soil nitrates, WFPS and temperature. In this regard, the empirically established relationships between the denitrification rate on intact soil cores under field conditions and the soil variables provided local-specific threshold values and coefficients which may effectively work to calibrate and adapt existing N2O process-based simulation models to the local pedo-climatic conditions.

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Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 74%

Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 99%

Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 99%

Section: Correlation and Regression Analysis (Cra) On The Whole Datasetmentioning

confidence: 99%

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Denitrification Rate and Its Potential to Predict Biogenic N2O Field Emissions in a Mediterranean Maize-Cropped Soil in Southern Italy

Forte

Fierro

2019

Land

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Assessing the Role of Air Nanobubble-Saturated Water in Enhancing Soil Moisture, Nutrient Retention, and Plant Growth

Arablousabet,

Povilaitis

2024

Sustainability

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Nanobubble-saturated water (NBSW) has received significant attention in water management in recent years. Therefore, three parallel experiments (E1, E2, and E3) were conducted on two silty loam soils (one with 12.11% higher clay) and sandy loam soil, with additional biochar amendments in each soil type, to assess air NBSW’s impact on soil moisture, nutrient retention, and plant growth. The results revealed increased soil moisture retention in the sandy loam and silty loam soils with a lower clay content. It reduced the K+ input compared to conventional watering without highly affecting the amount of leached-out substances. Biochar amendment significantly reduced the TDS losses from silty loam with a higher clay content and reduced the leaching of NO3−, Ca2+, and K+ from sandy loam soil. Air NBSW enhanced the stomatal conductance in California pepper plants in silty loam and sandy loam soils but had no effect on silty loam with a higher clay content. A decrease in chlorophyll concentrations and stomatal conductance was observed when air NBSW was combined with biochar in sandy loam soil. The study highlighted that air NBSW alone does not significantly affect water and nutrient retention or key plant parameters. However, its combination with biochar can enhance agricultural water management and sustainability by increasing soil moisture retention and reducing nutrient leaching.

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The Impact of Clay Minerals on Soil Hydrological Processes

Cited by 2 publications

References 14 publications

Denitrification Rate and Its Potential to Predict Biogenic N2O Field Emissions in a Mediterranean Maize-Cropped Soil in Southern Italy

Denitrification Rate and Its Potential to Predict Biogenic N2O Field Emissions in a Mediterranean Maize-Cropped Soil in Southern Italy

Assessing the Role of Air Nanobubble-Saturated Water in Enhancing Soil Moisture, Nutrient Retention, and Plant Growth

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