Modeling the effects of different irrigation water salinity on soil water movement, uptake and multicomponent solute transport

Lekakis, Emanuel; Antonopoulos, Vassilis Z.

doi:10.1016/j.jhydrol.2015.09.070

Cited by 45 publications

(21 citation statements)

References 48 publications

(53 reference statements)

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“…The threshold value is the EC e at which a decrease in crop yield begins, and the slope value describes the percent yield loss per increase in EC e in excess of the threshold level. The threshold and slope values were constant as soil salinity varied [70,71].…”

Section: Other Considerationsmentioning

confidence: 99%

HYDRUS Simulation of Sustainable Brackish Water Irrigation in a Winter Wheat-Summer Maize Rotation System in the North China Plain

Yang

et al. 2017

Water

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Freshwater resources in the North China Plain (NCP) are near depletion due to the unceasing overexploitation of deep groundwater, by far the most significant source of freshwater in the region. To deal with the deepening freshwater crisis, brackish water (rich but largely unused water in agriculture) is increasingly being used in irrigation in the region. However, inappropriate irrigation with brackish water could lead to soil salinization and cropland degradation. To evaluate such negative impacts, the HYDRUS-1D model was used to simulate soil salt transport and accumulation under 15 years of irrigation with brackish water. The irrigation scenarios included brackish water irrigation during the wintering and jointing stages of winter wheat and then freshwater irrigation just before the sowing of summer maize. Freshwater irrigation was done to leach out soil salts, which is particularly vital in dry years. For the littoral region of the plain, HYDRUS-ID was used to simulate the irrigated cropping system stated above for a total period of 15 years. The results showed that it was feasible to use brackish water twice in one year, provided freshwater irrigation was performed before sowing summer maize. Freshwater irrigation, in conjunction with precipitation, leached out soil salts from the 100 cm root-zone depth. The maximum salt accumulation was in the 160-220 cm soil layer, which ensured that root-zone soil was free of restrictive salinity for crop growth. Precipitation was a critical determinant of the rate and depth leaching of soil salt. Heavy rainfall (>100 mm) caused significant leaching of soluble salts in the 0-200 cm soil profile. Salt concentration under brackish water irrigation had no significant effect on the variations in the trend of soil salt transport in the soil profile. The variations of soil salinity were mainly affected by hydrological year type, for which the buried depth of soil salt was higher in wet years than in dry years. The study suggested that 15 years of irrigation with brackish water is a reliable and feasible mode of crop production in coastal regions with a thick soil column above the water table. The scheme proposed in this study allowed the use of brackish water in irrigation without undue salinization of the crop soil layer, an intuitive way of resolving the deepening water crisis in the NCP study area and beyond.

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Section: Other Considerationsmentioning

confidence: 99%

HYDRUS Simulation of Sustainable Brackish Water Irrigation in a Winter Wheat-Summer Maize Rotation System in the North China Plain

Yang

et al. 2017

Water

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“…Yao et al () found that for a canal lined with pebbles, water passed easily through the lining layer and infiltrated into the lower layer, thus the total water infiltration and wetted zone were larger than those for a clay soil layered lining; these results were derived by using HYDRUS‐2D simulations. Lekakis and Antonopoulos () found that in the upper layer of soil profiles, the water content was lower with a large value of the soil saturated hydraulic conductivity ( K s = 30.41 cm/h) in comparison to the bottom layer, which had a small soil saturated hydraulic conductivity ( K s = 1.61–2.40 cm/h) under full irrigation. Jury and Horton () proposed that soil layers with different textures throughout a soil profile would reduce water infiltration irrespective of whether they were coarser or finer compared with the surface soil.…”

Section: Introductionmentioning

confidence: 99%

Simulations of water movement and solute transport through different soil texture configurations under negative‐pressure irrigation

Wang

Huang

Long

et al. 2017

Hydrological Processes

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This study examined the effects of different soil texture configurations on water movement and solute transport to provide a reliable scientific basis for the application of negative‐pressure irrigation (NPI) technology. HYDRUS‐2D was used to analyse water movement and solute transport under NPI. The main results are as follows: (a) HYDRUS‐2D can be used to simulate water movement and solute transport under NPI, as there was good agreement between the simulated and measured values for water contents, NaCl concentrations, cumulative water infiltration, and wetting distances in the horizontal and vertical directions; the Nash–Sutcliffe efficiency coefficients were in the range of 0.94–0.97. (b) Layered soils have obvious effects on water movement under NPI. With the emitter position in the loam layer, when a coarse texture of loamy sand was present below the loam layer (namely, L‐LS), irrigation water accumulated in the topsoil, and this led to an increase in evaporation compared with the homogeneous loam profile. However, fine texture silty loam or silty clay loam layers beneath the loam layer (namely, L‐SiL or L‐SiCL, respectively) was more conducive to water infiltration into the lower layer, and this increased the amount of water infiltration and simultaneously reduced the surface evaporation effectively. (c) Layered soils have obvious effects on solute transport under NPI, and salt accumulation will readily occur in the clay‐rich soil layer at the interface. The maximum soil salt accumulation of L‐LS occurred above the soil interface between the two soil layers with a value of 21.80 g/kg; however, for L‐SiCL and L‐SiL, the maximum salt accumulation occurred below the soil interface between the two soil layers, with values of 23.80 g/kg and 20.08 g/kg, respectively. (d) Interlayered soils showed remarkable changes in the water infiltration characteristics and salt‐leaching intensities under NPI, and the properties for the soil profile with a silty loam interlayer were better than those for the soil profile with a silty clay loam interlayer. The soil profile with a loamy sand interlayer had the lowest amount of water infiltration, which resulted in reductions of the salt‐leaching intensities. Thus, NPI is clearly not suitable for loamy sand soil. Overall, the results demonstrated that soil texture configurations affected water movement and solute transport under NPI. Therefore, careful consideration should be given to the use of NPI to achieve target soil water and solution conditions and reduce water loss.

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“…Irrigation of these fields is inevitable if crop production is to be increased because there is a lack of precipitation in these regions. Thus, soil salinity and water resources shortage are two important limiting factors which could reduce crop production in agricultural fields (Pereira et al, 2002;Lekakis and Antonopoulos, 2015). Total areas equipped for irrigation are over 324 Mha (million hectares), of which about 85% or 275 Mha are actually irrigated (Food and Agriculture Organization of the United Nations (FAO), 2014).…”

Section: Introductionmentioning

confidence: 99%

Assessment of Solute Transport and Distribution Under Dry Drainage Conditions Using a Physical Model

Ansari

Abedi‐Koupai

Mostafazadeh‐Fard

et al. 2019

Irrigation and Drainage

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Researchers have recently investigated dry drainage in respect of decreasing environmental effects and investment cost reduction of traditional drainage systems in arid and semi‐arid regions. This study investigated the effect of dry drainage on solute transport in a loamy soil using a physical model. The experiment lasted 84 days and results showed that the dry drainage system transferred a significant amount of dissolved salts from the irrigated area into the fallow area. Moreover, sodium, potassium, calcium, nitrate and chloride ions accumulated in the upper layers of soil of the fallow area but magnesium accumulated in the deeper layers. The ratios of sodium, potassium, calcium, magnesium, nitrate and chloride concentrations at the soil surface of the fallow area to the corresponding values in the irrigated area were 1.67, 1.20, 1.81, 0.90, 2.58 and 1.20, respectively. In addition, variation of SAR in the soil profile of the irrigated area was low and its value approached 1.58, but it increased with decreasing soil depths of the fallow area reaching 2.17 at the soil surface of this area. Although the results demonstrated the capability of dry drainage to transfer ions from the irrigated to the fallow area, further investigation regarding different aspects of this method is recommended. © 2019 John Wiley & Sons, Ltd.

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Modeling the effects of different irrigation water salinity on soil water movement, uptake and multicomponent solute transport

Cited by 45 publications

References 48 publications

HYDRUS Simulation of Sustainable Brackish Water Irrigation in a Winter Wheat-Summer Maize Rotation System in the North China Plain

HYDRUS Simulation of Sustainable Brackish Water Irrigation in a Winter Wheat-Summer Maize Rotation System in the North China Plain

Simulations of water movement and solute transport through different soil texture configurations under negative‐pressure irrigation

Assessment of Solute Transport and Distribution Under Dry Drainage Conditions Using a Physical Model

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