Experimental Investigation of the Different Polyacrylamide Dosages on Soil Water Movement under Brackish Water Infiltration

Zhang, Jihong; Wang, Quanjiu; Mu, Weiyi; Wei, Kai; Guo, Yi; Sun, Yan

doi:10.3390/polym14122495

Cited by 10 publications

(8 citation statements)

References 33 publications

(47 reference statements)

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“…Our results showed that the effects of soil structure on soil water movement could also change after adding biochar or PAM (Figure 5), and this was also confirmed by some studies (Albalasmeh et al, 2021; Edeh & Mašek, 2022; Zhang et al, 2022). Based on our results, the intraporosity (13.2%) and interporosity (49.3%) of biochar particles were essential factors affecting the soil hydraulic properties.…”

Section: Discussionsupporting

confidence: 88%

“…The interpores of biochar mainly influenced the soil hydraulic conductivity, and their inter and intrapores controlled the soil water retention properties (Edeh & Mašek, 2022). Excessive application amounts of PAM could increase the viscosity of the soil, thereby influencing its infiltration (Albalasmeh et al, 2021; Zhang et al, 2022), therefore, the amount of PAM applied was determined to be suitable. After adding biochar and PAM, they changed the soil microstructure and thus would affect soil hydraulic properties and water movement.…”

Section: Discussionmentioning

confidence: 99%

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Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Fei,

She,

et al. 2024

Land Degrad Dev

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Increasing scientific knowledge on the improvement of coastal saline soils is critical for spatially expanding coastal development. Biochar and polyacrylamide (PAM) are popular soil amendments, however, it remains unclear how they affect water and salt transport by regulating soil microstructure characteristics. In this study, we conducted a five‐year rice barrel trial and investigated the changes in the aggregates and microstructure of saline soils after adding biochar with three different application rates (B1 = 0%, B2 = 2%, and B3 = 5%, mass ratio) and PAM with three different application rates (P1 = 0%, P2 = 0.4‰, and P3 = 1.0‰, mass ratio), and simulated the water and salt transport. Results showed that at B1 and B2 treatments, soil μ‐CT porosity in 2020 increased by 89.8% and 208.0%, respectively, with respect to that in 2016. The development of soil mesopore structure was promoted at B2 treatments, whereas the P2 and P3 treatments promoted the development of the soil macrostructure. Compared with those of the blank control, soil internal mean water flow rate increased by 22.2% at B2 treatments and 69.2% at P2 treatments, respectively. However, their increases were less pronounced at B3 treatments and the water flow rate decreased by 50.5% at P3 treatments. It might be reasonably attributed to the reason that porous biochar helped the formation of soil pore structure while an excessive amount of biochar blocked soil pores. Furthermore, PAM amendment helped to form soil aggregates while an excessive amount of viscous PAM might block soil pores or form a viscous layer. The time corresponding to the maximum salt concentration was negatively correlated with soil μ‐CT porosity (R2 = 0.27) and pore connectivity density (R2 = 0.29). Our findings indicate that appropriate amounts of biochar and PAM can help improve saline soil structure in coastal areas, improve their hydraulic properties, and alleviate salt stress.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Fei,

She,

et al. 2024

Land Degrad Dev

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“…The movemen ter through the soil can be determined by measuring the downward migration of ting front over time [25]. The experimental results (Figure 2) showed that the m distance of the wetting front shortened with the increasing amount of humic aci initial 0-30 min of infiltration, there was little difference in the advance rate of the peak among different treatments, which was due to the dry soil and large soil ma tential at the initial stage of infiltration, and the minimal interaction between hum and sierozem soil [26]. With increasing infiltration time, the migration trend of the front slowed, and the effect of the addition of humic acid on soil water infiltration became gradually significant.…”

Section: Effects Of Humic Acid Concentration On the Wetting Frontmentioning

confidence: 97%

Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition

Bai

et al. 2023

Water

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The farmland in Yinchuan is composed of sierozem soil, which is characterized by high sand content and low organic matter content, resulting in poor water-holding capacity and weak soil structure. Humic acid is a natural organic polymer soil amendment. It is critical to study how humic acid affects soil water infiltration in sierozem soil at the microlevel. A one-dimensional vertical infiltration experiment was conducted to explore how adding different amounts of humic acid (0, 1%, 2%, 3% and 4%) affected the infiltration characteristics and hydraulic parameters of the sierozem soil. The results revealed that the wetting front and cumulative infiltration decreased with the increase in humic acid addition. When the infiltration time was 90 min, the wetting front of the 1%, 2%, 3% and 4% treatments was 6.50%, 10.00%, 15.00% and 21.00% lower than CK (0 for CK), and the cumulative infiltration volume was 4.50%, 11.14%, 18.42% and 23.60% lower than CK, respectively. Among the three infiltration models created by Philip, Horton and Kostiakov, the Kostiakov model (R2 > 0.95) could more accurately describe the soil water infiltration process in the study area. After infiltration, the moisture content of each soil layer increased with the increase in humic acid, which improved the water-holding capacity of the sierozem soil. Using Hydrus-1D to calculate soil hydraulic parameters, we found that the humic acid addition affected the hydraulic parameters. With the increase in the amount of humic acid addition, the retention water content θr and saturated water θs were positively correlated with the humic acid addition amount and negatively correlated with the saturated water conductivity Ks and the reciprocal of air-entry α. The results showed that humic acid could increase the water-holding capacity of soil and improve the rapid water loss and poor water-holding capacity of sierozem soil.

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“…Kebede et al 36 discovered that the combination of amide polymers with lime, biochar, and other improvement agents can improve the stability of soil structure and enhance resistance to runoff erosion. Zhang et al 37 investigated the influence of different amounts of amide polymers on the water flow characteristics during the infiltration process of slightly saline water. Wang et al 38 mixed fly ash, anionic polyacrylamide and sandy soil to form a consolidated soil layer, which can increase the wind erosion resistance of the soil.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of influence of amide polymer on loess for subgrade

Yue,

Zhang,

Zhang

et al. 2024

Sci Rep

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The effects of moisture and drying shrinkage can lead to uneven settlement, cracking, and other diseases in loess subgrade. The objective of this study was to investigate the effects of amide polymer (AP) on the permeability, mechanical properties and crack resistance of loess by orthogonal experiments. The basic properties of AP and the permeability, mechanical properties, and dry–wet variation properties of polymer-modified loess were tested, and a scale model verification and simulation analysis were conducted. In this paper, water migration in subgrade is regulated by improving the water sensitivity of loess. By reducing the variation range of subgrade water content, the stress accumulation in subgrade caused by water is weakened. The results show that the curing time and mechanical properties of AP are directly affected by the oxidant and reducing agent, and the mechanical properties of AP are compatible with the characteristics of loess. AP filled the grain gap and reduced the permeability of loess by 34.05–280.83%. The ductility of polymer-modified loess is significantly increased, and the strain of peak strength is increased by 17.21–126.36%. AP can regulate moisture change, reduce the surface tension between particles, and reduce stress concentration. The strength loss rate was reduced by 19.98–51.21% by enhancing the cracking resistance and weakening the strength loss caused by dry and wet cycling. The increase of upper layer moisture content in the scale model of polymer-modified loess subgrade is reduced by 31.38–36.11%.

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Experimental Investigation of the Different Polyacrylamide Dosages on Soil Water Movement under Brackish Water Infiltration

Cited by 10 publications

References 33 publications

Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Roles of soil amendments in the water and salt transport of coastal saline soils through regulation of microstructure

Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition

Experimental investigation of influence of amide polymer on loess for subgrade

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