Field quantification of wetting–drying cycles to predict temporal changes of soil pore size distribution

Abstract

HighlightsSpectral analysis can quantify wetting–drying cycles from field water content data.Wetting–drying cycles increase macroporosity while decreasing pore heterogeneity.Drying periods increase frequency of smaller pores at the expense of macropores.The dynamics of pore size distribution can be predicted from wetting–drying pattern.

Seasonal changes in soil physical properties under long-term no-tillage

“…These results are consistent with those obtained by Bodner et al (2013), indicating that WDC positively influences macroporosity. Similar results were found by Pires et al (2008) who described the relationship between WDC and pore size distribution showing that the proportion of large-diameter pores and consequently total porosity increased with WDC.…”

“…Seasonal changes in soil physical properties are crop-specific and are generally attributed to factors including overall tillage operations (Osunbitan et al, 2005), soil disturbance beneath crop rows under NT (da Silva et al, 1997), occurrence and intensity of machinery traffic (Ahmad et al, 2009), changes in soil organic matter (Scott and Wood, 1989), cumulative rainfall after tillage (Busscher et al, 2002), activity of earthworms and other soil organisms (Yvan et al, 2012), occurrence of wetting-drying cycles Pires et al, 2008;Bodner et al, 2013), crop rotation (Sasal et al, 2010) and intercropping (Chioderoli et al, 2012). Data from a single sampling only indicates the physical soil condition at a specific sampling time.…”

“…Several regenerative processes determine soil physical resilience, including growth and activity of roots, shrinkswell processes driven by wetting-drying cycles (WDC) and activity of soil organisms (Gregory et al, 2007). In field experiments, Peng et al (2007) and Bodner et al (2013) showed that WDC resulted in increased soil macroporosity. In Brazilian soils, Bavoso et al (2012) found that WDC helped recover soil air permeability after mechanical stress (compaction).…”

Influence of drying–wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T2) relaxometry

“…Several researchers also reported that the impact of the first drying-wetting cycle on soil structure is D r a f t 2 greatest and decreases with subsequent cycles (Basma et al 1996;Tripathy et al 2002;Leij et al 2002). Bodner et al (2013) demonstrated that the pore size distribution (POSD) is closely related to cyclic drying-wetting, while overseason dynamics are mainly influenced by soil mechanical disturbance and crop rotation.…”

The Pro115Gln Missense Mutation of Peroxisome Proliferator Activated Receptor γ (PPARγ) Gene in Diabetes in the Pakistani Population

“…As the amount of glucose increases in the blood after meals, it triggers the release of a hormone, insulin, from the pancreas; this hormone stimulates the muscle and fat cells to remove the glucose from the blood and stimulates the liver to metabolize the glucose (2). Other functions of insulin include stimulation of the increased use of glucose in the synthesis of protein; increased gluconeogenesis; increased glucose metabolism, releasing energy in the form of ATP, and conversion of glucose to fats and so on (3).…”