Effect of physical amendments on salt leaching characteristics for reclamation

Shaygan, Mandana; Reading, Lucy; Baumgartl, Thomas

doi:10.1016/j.geoderma.2017.01.007

Cited by 63 publications

(63 citation statements)

References 58 publications

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“…Soil salinization and alkalization are serious soil degradation problems worldwide, encroaching on limited arable land and causing decrease in agricultural yields in many arid and semiarid regions. This poses a severe challenge to the sustainable development of agriculture (Qadir et al, ; Shaygan, Reading, & Baumgartl, ; Srivastava, Gupta, Shikha, & Tewari, ). Because saline–alkali land is usually flat and easy to cultivate with a deep soil layer, the improvement of saline–alkali land can effectively increase the area of cultivated land to enhance agricultural productivity and food security (Chi, Zhao, Sun, & Wang, ; Qadir, Noble, & Chartres, ; Rasouli, Kiani Pouya, & Karimian, ).…”

Section: Introductionmentioning

confidence: 99%

Quantitative evaluation of pore characteristics of sodic soils reclaimed by flue gas desulphurization gypsum using X‐ray computed tomography

Liao

Yang

et al. 2020

Land Degrad Dev

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Flue gas desulphurization (FGD) gypsum can effectively remediate sodic soils through improving two‐dimensional/three‐dimensional (3D) soil pore characteristics, especially vertical macroporosity. Understanding the response pattern of pore characteristics of sodic soils with different textures to FGD gypsum reclamation measures is critical to formulating appropriate improvement strategies for addressing growing challenges of land degradation. The objectives of this study were (a) to quantify the effect of FGD gypsum on two‐dimensional/three‐dimensional pore characteristics of amended sodic soils using X‐ray computed tomography (CT); and (b) to investigate the response pattern of different sodic soils to reclamation measures. Three types of intact sodic soils (sandy loam, silty loam, and silt soil) were collected from different sodic fields in north China for X‐ray CT image scan, and soil pore characteristic parameters (including porosity, pore network density, pore length density, and tortuosity) were measured. The results indicate that the high proportion of horizontal pores and lower pore length density are typical features in the sodic soils investigated. The responses of three sodic soils to reclamation measures demonstrate obvious variations that the 3D macroporosity of silt sodic soils was significantly increased (p < .05) by 53.7%, showing more sensitive and better effect than that of sandy loam (52.9%) and silty loam (20%) sodic soils, in which the reclamation improved the vertical macroporosity of silt sodic soil by 164.6%. It is speculated that the higher clay and silt contents in the silt sodic soils and their interaction with gypsum contribute to the expansion of pore size, and the formed macropore promotes the vertical migration of clay and silt particles to further increase the vertical macroporosity. In addition, FGD gypsum is beneficial for the formation of new pores in silt loam soils. The findings of this study confirm the feasibility of quantifying pore characteristics of sodic soils with the help of X‐ray CT images and suggest that it is necessary to adopt specific reclamation strategies for different degraded sodic soils.

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Section: Introductionmentioning

confidence: 99%

Quantitative evaluation of pore characteristics of sodic soils reclaimed by flue gas desulphurization gypsum using X‐ray computed tomography

Liao

Yang

et al. 2020

Land Degrad Dev

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“…This second issue in part explained the reduction of the desalination rate when time continued (Fig. 2 of Shaygan, Reading, and Baumgartl ()). Finally, physical crust (≠salt crust) due to wetting were significantly affected by sodium induced clay dispersion.…”

Section: Discussionmentioning

confidence: 99%

Water flow and salt transport in bare saline‐sodic soils subjected to evaporation and intermittent irrigation with saline/distilled water

Liu

She

2019

Land Degrad Dev

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Sustainable development of coastal reclamation areas is severely restricted by the high soil salt content and irrigation water salinity. We investigated the water flow and salt transport in open soil columns subjected to evaporation and intermittent irrigation with saline/distilled water by long-term wetting-drying cycles. The study included two different soil materials (silt loam and silty clay) with four to five soil sodicity levels. Three groups of experiments with three replicates were imposed: silt loam × 5 sodicity level, silty clay × 5 sodicity level, and 2 soil textures × 5 irrigation water qualities. Three irrigations were conducted in Spring to early Autumn (March 2, June 30, and September 8), whereas the soil columns were subjected to the natural evaporation without rainfall throughout the period September 9 to March 1. The average daily soil evaporation rate significantly decreased with the soil clay content (pr = −0.55; P < 0.001), soil exchangeable sodium percentage (pr = −0.54; P < 0.001), and irrigation water salinity (pr = −0.32; P < 0.001). The soil properties were the major factors responsible for controlling evaporation, whereas the irrigation water salinity was the less important factor. Soil salt distribution was significantly affected by the soil clay content (pr = 0.82; P < 0.001), soil depth (pr = 0.68; P < 0.05), soil exchangeable sodium percentage (pr = 0.85; P < 0.001), and irrigation water salinity (pr = 0.37; P < 0.001). The magnitudes of the steady-state infiltration rate i c and soil saturated hydraulic conductivity Ks were largely reduced by wetting-drying cycles, especially for the silty clay. Understanding water flow and salt transport in salinesodic soils subjected to evaporation and intermittent irrigation with saline/distilled water is important for improving the soil desalination project and strategy.

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“…Increasing the salinity and sodium of irrigation water and the soil reduced and increased the infiltration rate in 30% FC and FC management, respectively. According to the literature, increasing the SAR of the irrigation water and soil compared to EC caused the dispersion of soil particles; it will cause aggregate dispersion and decrease infiltration, whereas, if EC increases more than SAR, it has a positive effect on soil aggregation and stabilization (Emdad et al, ; Suarez et al, and Shaygan et al, ). One of the other reasons for greater sensitivity of the output parameters under FC management was that the water‐holding capacity under this management is more than under 30% FC management.…”

Section: Discussionmentioning

confidence: 99%

Effect of Initial Soil Water Content on Output Parameters of Sirmod Software Under Types of Different Irrigation Management

Javadi

Mostafazadeh‐Fard

Shayannejad

et al. 2019

Irrigation and Drainage

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The main objective of this study was to investigate the sensitivity of the output parameters of SIRMOD software relative to initial soil water content. The treatments consisted of three irrigation water qualities, two types of soil water content management (FC and 30% FC; FC is field capacity) and three irrigation events. The HYDRUS‐1D software was calibrated to simulate infiltration under different initial soil water contents. Subsequently, the infiltration coefficients obtained from the HYDRUS model were used to simulate the border irrigation system under the different border lengths and inflow rates using the SIRMOD software. The results showed that soil was more permeable under FC management than under 30% FC. The sensitivity of the output parameters of the SIRMOD software under FC was more sensitive compared to 30% FC. The high‐ and low‐sensitive treatments were in the FC and 30% FC management with high saline‐sodic water, respectively. Due to the high permeability under FC, in order to increase the irrigation application efficiency and reduce its sensitivity, the inflow rate should be greater while border length has to be less, compared to 30% FC. Sensitivity analysis of the output parameters showed that the advance time and tailwater fraction were identified as the most and least sensitive parameters, respectively. © 2019 John Wiley & Sons, Ltd.

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Effect of physical amendments on salt leaching characteristics for reclamation

Cited by 63 publications

References 58 publications

Quantitative evaluation of pore characteristics of sodic soils reclaimed by flue gas desulphurization gypsum using X‐ray computed tomography

Quantitative evaluation of pore characteristics of sodic soils reclaimed by flue gas desulphurization gypsum using X‐ray computed tomography

Water flow and salt transport in bare saline‐sodic soils subjected to evaporation and intermittent irrigation with saline/distilled water

Effect of Initial Soil Water Content on Output Parameters of Sirmod Software Under Types of Different Irrigation Management

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