Micro-CT assessment on the soil structure and hydraulic characteristics of saline/sodic soils subjected to short-term amendment

Fei, Yuanhang; She, Dongli; Gao, Lei; Xin, Pei

doi:10.1016/j.still.2019.05.024

Cited by 56 publications

(37 citation statements)

References 59 publications

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“…Edge enhancement was performed by adjusting the image contrast. After carefully comparing the initial images with the processed ones, individual threshold was screened for every image stack by the use of certain slices at diverse volume depths, for the sake of isolating pore phase away from soil [ 32 ]. According to segmentation of images, soil porosity was calculated and observed by the Avizo modules of Volume Fraction and Volume Rendering .…”

Section: Methodsmentioning

confidence: 99%

Effects of poly-γ-glutamic acid and poly-γ-glutamic acid super absorbent polymer on the sandy loam soil hydro-physical properties

Guo

Shi

et al. 2021

PLoS ONE

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The main forms of poly-γ-glutamic acid (γ-PGA) applied in agriculture include agricultural γ-PGA and γ-PGA super absorbent polymer (SAP). Laboratory experiments were conducted with a check treatment CK (no γ-PGA added) and two different forms of γ-PGA added to sandy loam soil (T and TM stand for γ-PGA and γ-PGA SAP) at four different soil mass ratios (0.05% (1), 0.10% (2), 0.15% (3) and 0.20% (4)) to determine their effects on sandy loam soil hydro-physical properties. Both of them could reduce the cumulative infiltration of soil water. The total available water (TAW) which the soil water content (SWC) from field water capacity (FC) to permanent wilting point (PWP) after γ-PGA added into sandy loam soil had no significant different compared with CK, and the TAW was highest at the treatment of γ-PGA with 0.10% addition amount into sandy loam soil. However, the TAW of sandy loam soil increased dramatically with the γ-PGA SAP addition amount increasing. TM3 had the highest soil water absorption among the treatments with γ-PGA SAP. The T1 to T4 treatments with γ-PGA addition slightly prolonged retention time (RT) when SWC varied from FC to PWP compared with CK. For γ-PGA SAP addition treatments, the time for SWC varied from FC to PWP was 1.48 times (TM1), 1.88 times (TM2), 2.01 times (TM3) and 2.87 times (TM4) longer than that of CK, respectively. The results of this study will provide further information for the use of these materials in agricultural application.

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Section: Methodsmentioning

confidence: 99%

Effects of poly-γ-glutamic acid and poly-γ-glutamic acid super absorbent polymer on the sandy loam soil hydro-physical properties

Guo

Shi

et al. 2021

PLoS ONE

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“…Previous studies have shown that there is a positive correlation between soil porosity and permeability (Fei et al, 2019; Ming, Chen, Li, & Wei, 2020; Miranda et al, 2018). In this study, we found that under the action of frost heaving, the porosity of soil gradually increases with an increase in the water content.…”

Section: Discussionmentioning

confidence: 94%

“…It has been beneficial that scholars have recently shown a great amount of interest in soil microstructure, in the field of agriculture. Some studies have shown that soil hydraulic properties are determined by the soil microstructure, with the pore distribution, particle arrangement, and overall porosity significantly affecting the movement and storage of water in soil (Ajayi, Holthusen, & Horn, 2016; Fei, She, Gao, & Xin, 2019; Vogel & Kretzschmar, 1996;). Therefore, we assume that the resulting deeper understanding of the microstructure of saline‐alkali soil will enable us to find a new approach to remediate these soils.…”

Section: Introductionmentioning

confidence: 99%

An evaluation of the effects of microstructural characteristics and frost heave on the remediation of saline‐alkali soils in the Yellow River Delta, China

Geng

et al. 2020

Land Degrad Dev

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In the Yellow River Delta of China, soil salinization is of serious concern from both agricultural and environmental perspectives. In this study we investigated the microstructural characteristics of saline‐alkali soils in this region and explored the influence of frost heave on soil microstructure. Soil mineral composition, pore distribution, particle arrangement, and pore characteristics were measured using X‐ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM). Soil pore characteristics, overall porosity, and unconfined compressive strength (UCS) were measured at water content of 10, 15, 20, 25% (w/w) before and after freezing at −10°C. The results showed that deterioration of soil physical properties was largely caused by dense particle arrangement, high proportion of ultra‐micropore‐specific surface area, and poor pore distribution, rather than mineral content or particle size distribution. The microstructure of saline‐alkali soil was greatly improved by frost heave with the overall porosity and UCS of frost heave‐treated soil samples significantly higher than for the control. Moreover, particle cementation decreased with increasing soil water content. This study demonstrated that a combination of XRD, SEM, and MIP offers accurate evaluation of the microstructural characteristics of saline‐alkali soils, and frost heave may serve as an economically sustainable and technically feasible method for saline‐alkali soil amelioration in the Yellow River Delta.

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“…Another possible reason is the increase in viscosity water when PAM is added. However, many researchers also reported the saturated hydraulic conductivity and in ltration rate increased with increasing PAM content [10,24]. For example, both in ltration rate and cumulative in ltration of sloping land (silty loam) increased as the application rates of PAM increased [8,25,26].…”

Section: Discussionmentioning

confidence: 99%

Comparison of the Effects of Polyacrylamide and Sodium Carboxymethylcellulose Application on Soil Water Infiltration in Sandy Loam Soils

Ning

Jumai

Wang

et al. 2019

Advances in Polymer Technology

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Superabsorbent polymers have been used widely in agricultural production in arid and semi-arid regions to manage the soil water holding capacity. As the common water-retention polymers, the molecular weights, and structures of polyacrylamide (PAM) and sodium carboxymethylcellulose (CMC) are obviously different. Modified soil water management with polymers (i.e., PAM and CMC) has shown great promise for water conservation. Few researchers have reported the comparison of the effects of PAM and CMC on soil infiltration characteristics, especially in coarse-textured soils (i.e., sandy loam). In this research, two high-molecular polymers (PAM and CMC) were used to investigate the effects of polymers on soil water infiltration characteristics by laboratory experiment. The infiltration reduction effects of CMC treatments were more obvious than those of PAM treatments. With the applied rates of PAM (0.2–0.8 g/kg) and CMC (1–4 g/kg) increased, the processes of soil water infiltration were inhibited. The average infiltration time of CMC with different application rates is 1.85 times than that of PAM with different treatments. The mean wetting front distances of different application rates treatments of PAM and CMC were 22.20 and 19.23 cm. At the same application rate, applied CMC is more effective in reducing soil sorptivity than applied PAM in sandy loam soils. Moreover, the cost of application of CMC is lower than the cost of application of PAM. The mean economic inputs of PAM and CMC were 153.90 and 35.24 RMB/hm2. Therefore, CMC was selected and recommended as the suitable water retention agent in sandy loam soils.

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Micro-CT assessment on the soil structure and hydraulic characteristics of saline/sodic soils subjected to short-term amendment

Cited by 56 publications

References 59 publications

Effects of poly-γ-glutamic acid and poly-γ-glutamic acid super absorbent polymer on the sandy loam soil hydro-physical properties

Effects of poly-γ-glutamic acid and poly-γ-glutamic acid super absorbent polymer on the sandy loam soil hydro-physical properties

An evaluation of the effects of microstructural characteristics and frost heave on the remediation of saline‐alkali soils in the Yellow River Delta, China

Comparison of the Effects of Polyacrylamide and Sodium Carboxymethylcellulose Application on Soil Water Infiltration in Sandy Loam Soils

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