Morphology and multifractal characteristics of soil pores and their functional implication

CATENA ◽  
2021 ◽  
Vol 196 ◽  
pp. 104822
Author(s):  
Xinni Ju ◽  
Yuhua Jia ◽  
Tongchuan Li ◽  
Lei Gao ◽  
Miao Gan
Keyword(s):  
Functional Implication ◽  
Soil Pores

Biological roles of the B cell receptor-associated protein 31: Functional Implication in Cancer

2021 ◽  
Vol 48 (1) ◽  
pp. 773-786
Author(s):  
Mwichie Namusamba ◽  
Zhi Li ◽  
Qi Zhang ◽  
Changli Wang ◽  
Tianyi Wang ◽  
...  
Keyword(s):  
B Cell ◽  
Cell Receptor ◽  
B Cell Receptor ◽  
Functional Implication ◽  
Receptor Associated Protein

scholarly journals The Influence of Drying-Wetting Cycles on the Suction Stress of Compacted Loess and the Associated Microscopic Mechanism

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1809
Author(s):  
Yongpeng Nie ◽  
Wankui Ni ◽  
Xiangning Li ◽  
Haiman Wang ◽  
Kangze Yuan ◽  
...  
Keyword(s):  
Filter Paper ◽  
Pore Diameter ◽  
Matric Suction ◽  
Microscopic Mechanism ◽  
Suction Stress ◽  
Dominant Soil ◽  
Before And After ◽  
Soil Pores ◽  
Paper Method ◽  
Compacted Loess

To better understand and analyze the unsaturated stability of loess filling body, it is necessary to study the changes in suction stress before and after the drying-wetting cycles. In this study, the SWCC of compacted loess before and after drying-wetting cycles was tested using the filter paper method. Then, the suction stress was calculated and the microstructure of the loess sample was determined by the SEM and NMR. The results showed that the drying-wetting cycles had an important influence on the SSCC and microstructure of compacted loess. The change in suction stress before and after the drying-wetting cycles can be well explained by the loess microstructure. The drying-wetting cycles did not significantly change the basic trend of the compacted loess’s SSCC, but it increased the porosity and the dominant pore diameter of loess, and reduced the suction stress under the same matric suction. The main significant change in suction stress with matric suction occurred within the range of the dominant soil pores. The larger the dominant pore diameter, the smaller the suction stress under the same matric suction. In addition, this study proposes a new method for calculating suction stress based on the PSD parameters.

Glucagon-like peptide-1 in the rat brain: Distribution of expression and functional implication

2013 ◽  
Vol 521 (10) ◽  
pp. 2235-2261 ◽  
Author(s):  
Guibao Gu ◽  
Barbara Roland ◽  
Kevin Tomaselli ◽  
Carrie S. Dolman ◽  
Carolyn Lowe ◽  
...  
Keyword(s):  
Rat Brain ◽  
Brain Distribution ◽  
Functional Implication ◽  
Glucagon Like Peptide ◽  
Glucagon Like Peptide 1

scholarly journals Optimising Cropping Techniques for Nutrient and Environmental Management in Organic Agriculture

2015 ◽  
Vol 4 (3) ◽  
pp. 15 ◽  
Author(s):  
Ulrich Kopke ◽  
Miriam Athmann ◽  
Eusun Han ◽  
Timo Kautz
Keyword(s):  
Nutrient Uptake ◽  
Organic Agriculture ◽  
Agricultural Production ◽  
Soil Structure ◽  
Nutrient Management ◽  
Solid Phase ◽  
Crop Productivity ◽  
Ecological Focus Areas ◽  
Perennial Legumes ◽  
Soil Pores

<p>Depth and architecture of root systems play a prominent role in crop productivity under conditions of low water and nutrient availability. The subsoil contains high amounts of nutrients that may potentially serve for nutrient uptake by crops including finite resources such as phosphorus that have to be used in moderation to delay their exhaustion. Biopores are tubular shaped continuous soil pores formed by plant roots and earthworms. Taproot systems especially those of perennial legumes can make soil nutrients plant available from the solid phase and increase the density of vertical biopores in the subsoil thus making subsoil layers more accessible for succeeding crops. Density of larger sized biopores is further enhanced by increased abundance and activity of anecic earthworms resulting from soil rest and amount of provided feed. Nutrient rich drilospheres can provide a favorable environment for roots and nutrient uptake of subsequent crops. Future efficient nutrient management and crop rotation design in organic agriculture should entail these strategies of soil fertility building and biopore services in subsoil layers site specifically. Elements of these concepts are suggested to be used also in mainstream agriculture headlands, e.g. as ‘Ecological Focus Areas’, in order to improve soil structure as well as to establish a web of biodiversity while avoiding constraints for agricultural production.</p>

Can pore-clogging by ash explain post-fire runoff?

2016 ◽  
Vol 25 (3) ◽  
pp. 294 ◽  
Author(s):  
Cathelijne R. Stoof ◽  
Anouk I. Gevaert ◽  
Christine Baver ◽  
Bahareh Hassanpour ◽  
Verónica L. Morales ◽  
...  
Keyword(s):  
Erosion Processes ◽  
Flow Processes ◽  
Field Soils ◽  
Negative Surface ◽  
Actual Flow ◽  
Negative Surface Charge ◽  
Strong Attachment ◽  
Soil Pores ◽  
Pore Clogging ◽  
Ash Transport

Ash plays an important role in controlling runoff and erosion processes after wildfire and has frequently been hypothesised to clog soil pores and reduce infiltration. Yet evidence for clogging is incomplete, as research has focussed on identifying the presence of ash in soil; the actual flow processes remain unknown. We conducted laboratory infiltration experiments coupled with microscope observations in pure sands, saturated hydraulic conductivity analysis, and interaction energy calculations, to test whether ash can clog pores (i.e. block pores such that infiltration is hampered and ponding occurs). Although results confirmed previous observations of ash washing into pores, clogging was not observed in the pure sands tested, nor were conditions found for which this does occur. Clogging by means of strong attachment of ash to sand was deemed unlikely given the negative surface charge of the two materials. Ponding due to washing in of ash was also considered improbable given the high saturated conductivity of pure ash and ash–sand mixtures. This first mechanistic step towards analysing ash transport and attachment processes in field soils therefore suggests that pore clogging by ash is unlikely to occur in sands. Discussion is provided on other mechanisms by which ash can affect post-fire hydrology.

scholarly journals Calculation of the Height of Capillary Rise of Water in Soils

2020 ◽  
Vol 8 (6) ◽  
pp. 4832-4835
Keyword(s):  
Water Saturation ◽  
Underground Structure ◽  
Capillary Rise ◽  
Soil Layer ◽  
Underground Water ◽  
Wall Material ◽  
Capillary Water ◽  
Temporary Streams ◽  
Filter Water ◽  
Soil Pores

Rain and melt water will form temporary accumulations of surface water on the surface. When they seep into the ground, temporary streams of leaky filter water are formed. If a limited section of water-resistant soil layer or the roof of an underground structure is encountered in the path of these waters, a temporary aquifer-the upper layer of ground water-may form above them. In temporary and permanent aquifers, the soil pores are completely filled with gravitational water, the degree of water saturation is equal to one, and there is pressure under the surface of underground water. Above this surface is a zone of capillary moisture, while the level of capillary rise is determined by the granulometric composition of the soil and ranges from tens of centimeters in sand to several meters in dusty and clay soils. Capillary water rises in the ground on free canals formed by mutually communicating pores, or is kept in them in limbo.The lifting of the liquid in the capillary continues until the gravity acting on the column of the liquid in the capillary becomes equal to the resulting force. Capillary water penetrates from the ground into the walls and rises to a height of up to 2 meters. The normal moisture content of the brick walls is 0.02...0,03, and in the case of unprotected contact with moist soil is increased to 0.15...0.25. On the inside of the walls there is a damp, mildew. Evaporating water increases humidity in the room, and the salts released when it evaporates from salt solutions lead to peeling paint, destruction of plaster and wall material.

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