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Shuqin Wan - One of the best experts on this subject based on the ideXlab platform.
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effect of different water application intensity and irrigation amount treatments of microirrigation on soil leaching coastal Saline Soils of north china
Journal of Integrative Agriculture, 2016Co-Authors: Yaohu Kang, Linlin Chu, Shuqin WanAbstract:In coastal regions, Bohai Gulf is one of the most affected areas by salinization. To study the effects of mocrosprinkler irrigation on the characteristics of highly Saline sandy loam soil (ECe (saturated paste extract)=22.3 dS m−1; SAR (sodium adsorption ratio)=49.0) of North China, a laboratory experiment was conducted. Five water application intensity (WAI) treatments (1.7, 3.1, 5.3, 8.8, and 10.1 mm h−1), five irrigation amount (IA) treatments (148, 168, 184, 201, and 223 mm) and three time periods of water redistribution (0, 24 and 48 h) were employed in the study. A compounding microsprinkler system was used for the WAI treatments, and a single microsprinkler was used for the IA treatments. The results indicated that, as soil depth increased, soil water content (θ) increased and then slightly decreased; with WAI and IA consistently increasing, the relatively moist region expanded and the average θ increased. Meanwhile, soil ECe increased as soil depth increased, and the zone with low soil salinity expanded as WAI and IA increased. Although the reduction of the average SAR was smaller than that of the average electrical conductivity of the ECe, these variables decreased in similar fashion as WAI and IA increased under microsprinkler irrigation. The average pH decreased as soil depth increased. Longer time periods of water redistribution led to lower salinity and slight expansion of the SAR zone. Considering the effects of leached salts in coastal Saline Soils, greater WAI and IA values are more advantageous under unsaturated flow conditions, as they cause better water movement in the soil. After leaching due to microsprinkler irrigation, highly Saline soil gradually changes to moderately Saline soil. The results provide theoretical and technological guidance for the salt leaching and landscaping of highly Saline coastal environments.
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effects of water application intensity of microsprinkler irrigation on water and salt environment and crop growth in coastal Saline Soils
Journal of Integrative Agriculture, 2015Co-Authors: Yaohu Kang, Linlin Chu, Shuqin WanAbstract:Laboratory and field experiments were conducted to investigate the effects of water application intensity (WAI) on soil salinity management and the growth of Festuca arundinacea (festuca) under three stages of water and salt management strategies using microsprinkler irrigation in Hebei Province, North China. The soil water content (e) and salinity of homogeneous coastal Saline Soils were evaluated under different water application intensities in the laboratory experiment. The results indicated that the WAI of microsprinkler irrigation influenced the e, electrical conductivity (ECe) and pH of Saline Soils. As the WAI increased, the average values of e and ECe in the 0-40 cm profile also increased, while their average values in the 40-60 cm profile decreased. The pH value also slightly decreased as depth increased, but no significant differences were observed between the different treatments. The time periods of the water redistribution treatments had no obvious effects. Based on the results for e, ECe and pH, a smaller WAI was more desirable. The field experiment was conducted after being considered the results of the technical parameter experiment and evaporation, wind and leaching duration. The field experiment included three stages of water and salt regulation, based on three soil matric potentials (SMP), in which the SMP at a 20-cm depth below the surface was used to trigger irrigation. The results showed that the microsprinkler irrigation created an appropriate environment for festuca growth through the three stages of water and salt regulation. The low-salinity conditions that occurred at 0-10 cm depth during the first stage (-5 kPa) continued to expand through the next two stages. The average pH value was less than 8.5. The tiller number of festuca increased as SMP decreased from the first stage to the third stage. After the three stages of water and salt regulation, the highly Saline soil gradually changed to a low-Saline soil. Overall, based on the salt desalinization, the microsprinkler irrigation and three stages of water and salt regulation could be successfully used to cultivate plants for the reclamation of coastal Saline land in North China.
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effects of an imbedded gravel sand layer on reclamation of coastal Saline Soils under drip irrigation and on plant growth
Agricultural Water Management, 2013Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin WanAbstract:Governmental goals for the development of new municipalities in areas of very Saline Soils near shorelines of the Bohai Gulf, in north China, include planting landscape trees and shrubs along streets and highways, and in parks in residential areas. The Soils are Saline because of the presence of shallow groundwater (45-138 cm) with salinity levels of >24 dS m(-1). Prevention of upward water movement from the Saline groundwater could be an important factor in facilitating reclamation of the soil above the water table, as well as the long-term sustainability of any reclamation that is achieved. The possibility of placing a 20-cm thick layer of gravel-sand at a depth of 80 cm to block upward water movement was evaluated in a three-year field experiment conducted during 2009-2011. Soil salinity and growth of landscape plant species were measured. Irrigation water was the local deep groundwater with electrical conductivity of 1.7-2.1 dS m(-1) and SAR (sodium adsorption ratio) of 4.3 mmol L-1. Results indicated that the extent of desalinization (the ratio of salt content leached to the initial salt content) for the imbedded gravel-sand layer (GL) was larger than that for the non-gravel-sand layer treatment (NGL). Less salt accumulated in the surface soil during winter in GL compared to NGL. The mean electrical conductivity of saturated paste extracts (ECe) were <5 dS m(-1) in root distribution zones (0-40 cm) for NGL compared to 3 dS m(-1) for GL; the corresponding pH of saturated paste extracts (pHe) were 8.5 and 8.7. The influences of time, treatment and time x treatment on soil ECe and pHe were significant. At the end of the treatment, the salinity levels in root zones for both treatments were suitable for the growth of plants that were moderately sensitive to salinity (3-4 dS m(-1)). The results provide theoretical and technological guidance for salt leaching and landscaping of highly Saline lands located along the coast of the Pacific Ocean. (C) 2013 Elsevier B.V. All rights reserved.
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effects of an imbedded gravel sand layer on reclamation of coastal Saline Soils under drip irrigation and on plant growth
Agricultural Water Management, 2013Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin WanAbstract:Governmental goals for the development of new municipalities in areas of very Saline Soils near shorelines of the Bohai Gulf, in north China, include planting landscape trees and shrubs along streets and highways, and in parks in residential areas. The Soils are Saline because of the presence of shallow groundwater (45–138cm) with salinity levels of >24dSm−1. Prevention of upward water movement from the Saline groundwater could be an important factor in facilitating reclamation of the soil above the water table, as well as the long-term sustainability of any reclamation that is achieved. The possibility of placing a 20-cm thick layer of gravel–sand at a depth of 80cm to block upward water movement was evaluated in a three-year field experiment conducted during 2009–2011. Soil salinity and growth of landscape plant species were measured. Irrigation water was the local deep groundwater with electrical conductivity of 1.7–2.1dSm−1 and SAR (sodium adsorption ratio) of 4.3mmolL−1. Results indicated that the extent of desalinization (the ratio of salt content leached to the initial salt content) for the imbedded gravel–sand layer (GL) was larger than that for the non-gravel–sand layer treatment (NGL). Less salt accumulated in the surface soil during winter in GL compared to NGL. The mean electrical conductivity of saturated paste extracts (ECe) were <5dSm−1 in root distribution zones (0–40cm) for NGL compared to 3dSm−1 for GL; the corresponding pH of saturated paste extracts (pHe) were 8.5 and 8.7. The influences of time, treatment and time×treatment on soil ECe and pHe were significant. At the end of the treatment, the salinity levels in root zones for both treatments were suitable for the growth of plants that were moderately sensitive to salinity (3–4dSm−1). The results provide theoretical and technological guidance for salt leaching and landscaping of highly Saline lands located along the coast of the Pacific Ocean.
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soil salinity management with drip irrigation and its effects on soil hydraulic properties in north china coastal Saline Soils
Agricultural Water Management, 2012Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin Wan, Shufang Jiang, Tibin ZhangAbstract:A field experiment with five soil matric potential (SMP) treatments (-5, -10, -15, -20 and -25 kPa) was used to study the effects of drip irrigation on soil salinity, soil hydraulic properties and vegetation growth in coastal Saline Soils of north China. Irrigation water came from local groundwater with electrical conductivity of 1.7-2.1 dS m(-1). The experiment was conducted over three years: 2009-2011. Soil hydraulic properties (hydraulic conductivities, Gardner alpha and the contribution of pore classes to water flow) were measured three times, i.e. the baseline value (CK) before experiment in 2009, and after one and two years of soil salinity leaching in 2010 and 2011, respectively. Results indicated that low salinity zones existed in the experimental treatments and had expanded during drip irrigation when SMP was controlled at higher than -25 kPa, the average electrical conductivity of the saturation paste extract (ECe) in root zones was below 8 dS m(-1) for -5, -10, -15, -20 and -25 kPa treatments, and the highest ratio of desalinization (the removal of salt content accounted for the percentage of initial salt content by leaching) in the whole soil profile for the -5 kPa treatment was 64.4%. Meanwhile, the pH of saturated soil extracts concomitantly increased with drip irrigation in the soil profile, whereas it was slightly affected by SMP under drip irrigation. In addition, the hydraulic conductivities, Gardner alpha and the contribution of macropores (>0.5 mm) and mesopores (0.5-0.25 mm) to water flow in the surface layer in all five SMP treatments were greater than those in the CK treatment, which indicated that the soil structure had improved. The native vegetation was reed [Phragmites australis (Cav.) Trin. ex Steud.] and suaeda (Suaeda glauca Bge) community. After treatment, the average survival rate of low salt-tolerant plants (Hibiscus syriacus, Prunus cerasifera Ehrh., Ilex buxoides S.Y. Hu and Ligustrum lucidum) was 48.9% at the end of the third year of treatment. Overall, based on salt ratio of desalinization, the SMP above -5 kPa at a depth of 20 cm immediately under a drip emitter could be used as an indicator of irrigation scheduling for vegetation rehabilitation in north China coastal Saline Soils. (c) 2012 Elsevier B.V. All rights reserved.
Yaohu Kang - One of the best experts on this subject based on the ideXlab platform.
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salt leaching and response of dianthus chinensis l to Saline water drip irrigation in two coastal Saline Soils
Agricultural Water Management, 2019Co-Authors: Chen Zhang, Yaohu Kang, Xunming WangAbstract:Abstract Using of Saline water is becoming an important approach to reclaim and utilize salt-affected soil for landscaping and agricultural purposes. A three-year field experiment was conducted in Hebei Province, North China to cultivate a perennial flower, Dianthus chinensis L., on two coastal Saline Soils of different textures, silt (27.79 dS·m−1) and sandy loam (27.33 dS·m−1), using the drip irrigation at five levels of water salinity (ECi = 0.8, 3.1, 4.7, 6.3 and 7.8 dS·m−1). Effect of water salinity on salt distribution in soil profile and plant growth and physiological response were investigated. The irrigation water salinity tolerance threshold of D. chinensis in terms of shoot dry weight was also evaluated. Results shown that, after three growing seasons, the highly Saline Soils reclaimed to 80% retained for all treatments in the third year. The decline of shoot K+ concentration, excessive accumulation of Na+, and concomitant reduction of K+/Na+ ratio were observed with increasing ECi. The irrigation water salinity thresholds of D. chinensis, aimed at biological production, are 3.17 dS·m−1 for silt soil and 1.62 dS·m−1 for sandy loam soil; for landscaping purpose, the corresponding values are 5.65 and 6.98 dS·m−1.
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effect of different water application intensity and irrigation amount treatments of microirrigation on soil leaching coastal Saline Soils of north china
Journal of Integrative Agriculture, 2016Co-Authors: Yaohu Kang, Linlin Chu, Shuqin WanAbstract:In coastal regions, Bohai Gulf is one of the most affected areas by salinization. To study the effects of mocrosprinkler irrigation on the characteristics of highly Saline sandy loam soil (ECe (saturated paste extract)=22.3 dS m−1; SAR (sodium adsorption ratio)=49.0) of North China, a laboratory experiment was conducted. Five water application intensity (WAI) treatments (1.7, 3.1, 5.3, 8.8, and 10.1 mm h−1), five irrigation amount (IA) treatments (148, 168, 184, 201, and 223 mm) and three time periods of water redistribution (0, 24 and 48 h) were employed in the study. A compounding microsprinkler system was used for the WAI treatments, and a single microsprinkler was used for the IA treatments. The results indicated that, as soil depth increased, soil water content (θ) increased and then slightly decreased; with WAI and IA consistently increasing, the relatively moist region expanded and the average θ increased. Meanwhile, soil ECe increased as soil depth increased, and the zone with low soil salinity expanded as WAI and IA increased. Although the reduction of the average SAR was smaller than that of the average electrical conductivity of the ECe, these variables decreased in similar fashion as WAI and IA increased under microsprinkler irrigation. The average pH decreased as soil depth increased. Longer time periods of water redistribution led to lower salinity and slight expansion of the SAR zone. Considering the effects of leached salts in coastal Saline Soils, greater WAI and IA values are more advantageous under unsaturated flow conditions, as they cause better water movement in the soil. After leaching due to microsprinkler irrigation, highly Saline soil gradually changes to moderately Saline soil. The results provide theoretical and technological guidance for the salt leaching and landscaping of highly Saline coastal environments.
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effects of water application intensity of microsprinkler irrigation on water and salt environment and crop growth in coastal Saline Soils
Journal of Integrative Agriculture, 2015Co-Authors: Yaohu Kang, Linlin Chu, Shuqin WanAbstract:Laboratory and field experiments were conducted to investigate the effects of water application intensity (WAI) on soil salinity management and the growth of Festuca arundinacea (festuca) under three stages of water and salt management strategies using microsprinkler irrigation in Hebei Province, North China. The soil water content (e) and salinity of homogeneous coastal Saline Soils were evaluated under different water application intensities in the laboratory experiment. The results indicated that the WAI of microsprinkler irrigation influenced the e, electrical conductivity (ECe) and pH of Saline Soils. As the WAI increased, the average values of e and ECe in the 0-40 cm profile also increased, while their average values in the 40-60 cm profile decreased. The pH value also slightly decreased as depth increased, but no significant differences were observed between the different treatments. The time periods of the water redistribution treatments had no obvious effects. Based on the results for e, ECe and pH, a smaller WAI was more desirable. The field experiment was conducted after being considered the results of the technical parameter experiment and evaporation, wind and leaching duration. The field experiment included three stages of water and salt regulation, based on three soil matric potentials (SMP), in which the SMP at a 20-cm depth below the surface was used to trigger irrigation. The results showed that the microsprinkler irrigation created an appropriate environment for festuca growth through the three stages of water and salt regulation. The low-salinity conditions that occurred at 0-10 cm depth during the first stage (-5 kPa) continued to expand through the next two stages. The average pH value was less than 8.5. The tiller number of festuca increased as SMP decreased from the first stage to the third stage. After the three stages of water and salt regulation, the highly Saline soil gradually changed to a low-Saline soil. Overall, based on the salt desalinization, the microsprinkler irrigation and three stages of water and salt regulation could be successfully used to cultivate plants for the reclamation of coastal Saline land in North China.
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effects of an imbedded gravel sand layer on reclamation of coastal Saline Soils under drip irrigation and on plant growth
Agricultural Water Management, 2013Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin WanAbstract:Governmental goals for the development of new municipalities in areas of very Saline Soils near shorelines of the Bohai Gulf, in north China, include planting landscape trees and shrubs along streets and highways, and in parks in residential areas. The Soils are Saline because of the presence of shallow groundwater (45–138cm) with salinity levels of >24dSm−1. Prevention of upward water movement from the Saline groundwater could be an important factor in facilitating reclamation of the soil above the water table, as well as the long-term sustainability of any reclamation that is achieved. The possibility of placing a 20-cm thick layer of gravel–sand at a depth of 80cm to block upward water movement was evaluated in a three-year field experiment conducted during 2009–2011. Soil salinity and growth of landscape plant species were measured. Irrigation water was the local deep groundwater with electrical conductivity of 1.7–2.1dSm−1 and SAR (sodium adsorption ratio) of 4.3mmolL−1. Results indicated that the extent of desalinization (the ratio of salt content leached to the initial salt content) for the imbedded gravel–sand layer (GL) was larger than that for the non-gravel–sand layer treatment (NGL). Less salt accumulated in the surface soil during winter in GL compared to NGL. The mean electrical conductivity of saturated paste extracts (ECe) were <5dSm−1 in root distribution zones (0–40cm) for NGL compared to 3dSm−1 for GL; the corresponding pH of saturated paste extracts (pHe) were 8.5 and 8.7. The influences of time, treatment and time×treatment on soil ECe and pHe were significant. At the end of the treatment, the salinity levels in root zones for both treatments were suitable for the growth of plants that were moderately sensitive to salinity (3–4dSm−1). The results provide theoretical and technological guidance for salt leaching and landscaping of highly Saline lands located along the coast of the Pacific Ocean.
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effects of an imbedded gravel sand layer on reclamation of coastal Saline Soils under drip irrigation and on plant growth
Agricultural Water Management, 2013Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin WanAbstract:Governmental goals for the development of new municipalities in areas of very Saline Soils near shorelines of the Bohai Gulf, in north China, include planting landscape trees and shrubs along streets and highways, and in parks in residential areas. The Soils are Saline because of the presence of shallow groundwater (45-138 cm) with salinity levels of >24 dS m(-1). Prevention of upward water movement from the Saline groundwater could be an important factor in facilitating reclamation of the soil above the water table, as well as the long-term sustainability of any reclamation that is achieved. The possibility of placing a 20-cm thick layer of gravel-sand at a depth of 80 cm to block upward water movement was evaluated in a three-year field experiment conducted during 2009-2011. Soil salinity and growth of landscape plant species were measured. Irrigation water was the local deep groundwater with electrical conductivity of 1.7-2.1 dS m(-1) and SAR (sodium adsorption ratio) of 4.3 mmol L-1. Results indicated that the extent of desalinization (the ratio of salt content leached to the initial salt content) for the imbedded gravel-sand layer (GL) was larger than that for the non-gravel-sand layer treatment (NGL). Less salt accumulated in the surface soil during winter in GL compared to NGL. The mean electrical conductivity of saturated paste extracts (ECe) were <5 dS m(-1) in root distribution zones (0-40 cm) for NGL compared to 3 dS m(-1) for GL; the corresponding pH of saturated paste extracts (pHe) were 8.5 and 8.7. The influences of time, treatment and time x treatment on soil ECe and pHe were significant. At the end of the treatment, the salinity levels in root zones for both treatments were suitable for the growth of plants that were moderately sensitive to salinity (3-4 dS m(-1)). The results provide theoretical and technological guidance for salt leaching and landscaping of highly Saline lands located along the coast of the Pacific Ocean. (C) 2013 Elsevier B.V. All rights reserved.
Jiaxia Sun - One of the best experts on this subject based on the ideXlab platform.
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effects of an imbedded gravel sand layer on reclamation of coastal Saline Soils under drip irrigation and on plant growth
Agricultural Water Management, 2013Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin WanAbstract:Governmental goals for the development of new municipalities in areas of very Saline Soils near shorelines of the Bohai Gulf, in north China, include planting landscape trees and shrubs along streets and highways, and in parks in residential areas. The Soils are Saline because of the presence of shallow groundwater (45-138 cm) with salinity levels of >24 dS m(-1). Prevention of upward water movement from the Saline groundwater could be an important factor in facilitating reclamation of the soil above the water table, as well as the long-term sustainability of any reclamation that is achieved. The possibility of placing a 20-cm thick layer of gravel-sand at a depth of 80 cm to block upward water movement was evaluated in a three-year field experiment conducted during 2009-2011. Soil salinity and growth of landscape plant species were measured. Irrigation water was the local deep groundwater with electrical conductivity of 1.7-2.1 dS m(-1) and SAR (sodium adsorption ratio) of 4.3 mmol L-1. Results indicated that the extent of desalinization (the ratio of salt content leached to the initial salt content) for the imbedded gravel-sand layer (GL) was larger than that for the non-gravel-sand layer treatment (NGL). Less salt accumulated in the surface soil during winter in GL compared to NGL. The mean electrical conductivity of saturated paste extracts (ECe) were <5 dS m(-1) in root distribution zones (0-40 cm) for NGL compared to 3 dS m(-1) for GL; the corresponding pH of saturated paste extracts (pHe) were 8.5 and 8.7. The influences of time, treatment and time x treatment on soil ECe and pHe were significant. At the end of the treatment, the salinity levels in root zones for both treatments were suitable for the growth of plants that were moderately sensitive to salinity (3-4 dS m(-1)). The results provide theoretical and technological guidance for salt leaching and landscaping of highly Saline lands located along the coast of the Pacific Ocean. (C) 2013 Elsevier B.V. All rights reserved.
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effects of an imbedded gravel sand layer on reclamation of coastal Saline Soils under drip irrigation and on plant growth
Agricultural Water Management, 2013Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin WanAbstract:Governmental goals for the development of new municipalities in areas of very Saline Soils near shorelines of the Bohai Gulf, in north China, include planting landscape trees and shrubs along streets and highways, and in parks in residential areas. The Soils are Saline because of the presence of shallow groundwater (45–138cm) with salinity levels of >24dSm−1. Prevention of upward water movement from the Saline groundwater could be an important factor in facilitating reclamation of the soil above the water table, as well as the long-term sustainability of any reclamation that is achieved. The possibility of placing a 20-cm thick layer of gravel–sand at a depth of 80cm to block upward water movement was evaluated in a three-year field experiment conducted during 2009–2011. Soil salinity and growth of landscape plant species were measured. Irrigation water was the local deep groundwater with electrical conductivity of 1.7–2.1dSm−1 and SAR (sodium adsorption ratio) of 4.3mmolL−1. Results indicated that the extent of desalinization (the ratio of salt content leached to the initial salt content) for the imbedded gravel–sand layer (GL) was larger than that for the non-gravel–sand layer treatment (NGL). Less salt accumulated in the surface soil during winter in GL compared to NGL. The mean electrical conductivity of saturated paste extracts (ECe) were <5dSm−1 in root distribution zones (0–40cm) for NGL compared to 3dSm−1 for GL; the corresponding pH of saturated paste extracts (pHe) were 8.5 and 8.7. The influences of time, treatment and time×treatment on soil ECe and pHe were significant. At the end of the treatment, the salinity levels in root zones for both treatments were suitable for the growth of plants that were moderately sensitive to salinity (3–4dSm−1). The results provide theoretical and technological guidance for salt leaching and landscaping of highly Saline lands located along the coast of the Pacific Ocean.
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soil salinity management with drip irrigation and its effects on soil hydraulic properties in north china coastal Saline Soils
Agricultural Water Management, 2012Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin Wan, Shufang Jiang, Tibin ZhangAbstract:A field experiment with five soil matric potential (SMP) treatments (-5, -10, -15, -20 and -25 kPa) was used to study the effects of drip irrigation on soil salinity, soil hydraulic properties and vegetation growth in coastal Saline Soils of north China. Irrigation water came from local groundwater with electrical conductivity of 1.7-2.1 dS m(-1). The experiment was conducted over three years: 2009-2011. Soil hydraulic properties (hydraulic conductivities, Gardner alpha and the contribution of pore classes to water flow) were measured three times, i.e. the baseline value (CK) before experiment in 2009, and after one and two years of soil salinity leaching in 2010 and 2011, respectively. Results indicated that low salinity zones existed in the experimental treatments and had expanded during drip irrigation when SMP was controlled at higher than -25 kPa, the average electrical conductivity of the saturation paste extract (ECe) in root zones was below 8 dS m(-1) for -5, -10, -15, -20 and -25 kPa treatments, and the highest ratio of desalinization (the removal of salt content accounted for the percentage of initial salt content by leaching) in the whole soil profile for the -5 kPa treatment was 64.4%. Meanwhile, the pH of saturated soil extracts concomitantly increased with drip irrigation in the soil profile, whereas it was slightly affected by SMP under drip irrigation. In addition, the hydraulic conductivities, Gardner alpha and the contribution of macropores (>0.5 mm) and mesopores (0.5-0.25 mm) to water flow in the surface layer in all five SMP treatments were greater than those in the CK treatment, which indicated that the soil structure had improved. The native vegetation was reed [Phragmites australis (Cav.) Trin. ex Steud.] and suaeda (Suaeda glauca Bge) community. After treatment, the average survival rate of low salt-tolerant plants (Hibiscus syriacus, Prunus cerasifera Ehrh., Ilex buxoides S.Y. Hu and Ligustrum lucidum) was 48.9% at the end of the third year of treatment. Overall, based on salt ratio of desalinization, the SMP above -5 kPa at a depth of 20 cm immediately under a drip emitter could be used as an indicator of irrigation scheduling for vegetation rehabilitation in north China coastal Saline Soils. (c) 2012 Elsevier B.V. All rights reserved.
Tibin Zhang - One of the best experts on this subject based on the ideXlab platform.
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soil salinity management with drip irrigation and its effects on soil hydraulic properties in north china coastal Saline Soils
Agricultural Water Management, 2012Co-Authors: Jiaxia Sun, Yaohu Kang, Shuqin Wan, Shufang Jiang, Tibin ZhangAbstract:A field experiment with five soil matric potential (SMP) treatments (-5, -10, -15, -20 and -25 kPa) was used to study the effects of drip irrigation on soil salinity, soil hydraulic properties and vegetation growth in coastal Saline Soils of north China. Irrigation water came from local groundwater with electrical conductivity of 1.7-2.1 dS m(-1). The experiment was conducted over three years: 2009-2011. Soil hydraulic properties (hydraulic conductivities, Gardner alpha and the contribution of pore classes to water flow) were measured three times, i.e. the baseline value (CK) before experiment in 2009, and after one and two years of soil salinity leaching in 2010 and 2011, respectively. Results indicated that low salinity zones existed in the experimental treatments and had expanded during drip irrigation when SMP was controlled at higher than -25 kPa, the average electrical conductivity of the saturation paste extract (ECe) in root zones was below 8 dS m(-1) for -5, -10, -15, -20 and -25 kPa treatments, and the highest ratio of desalinization (the removal of salt content accounted for the percentage of initial salt content by leaching) in the whole soil profile for the -5 kPa treatment was 64.4%. Meanwhile, the pH of saturated soil extracts concomitantly increased with drip irrigation in the soil profile, whereas it was slightly affected by SMP under drip irrigation. In addition, the hydraulic conductivities, Gardner alpha and the contribution of macropores (>0.5 mm) and mesopores (0.5-0.25 mm) to water flow in the surface layer in all five SMP treatments were greater than those in the CK treatment, which indicated that the soil structure had improved. The native vegetation was reed [Phragmites australis (Cav.) Trin. ex Steud.] and suaeda (Suaeda glauca Bge) community. After treatment, the average survival rate of low salt-tolerant plants (Hibiscus syriacus, Prunus cerasifera Ehrh., Ilex buxoides S.Y. Hu and Ligustrum lucidum) was 48.9% at the end of the third year of treatment. Overall, based on salt ratio of desalinization, the SMP above -5 kPa at a depth of 20 cm immediately under a drip emitter could be used as an indicator of irrigation scheduling for vegetation rehabilitation in north China coastal Saline Soils. (c) 2012 Elsevier B.V. All rights reserved.
Cui Zhang - One of the best experts on this subject based on the ideXlab platform.
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cleaner production of salt tolerance vegetable in coastal Saline Soils using reclaimed water irrigation observations from alleviated accumulation of endocrine disrupting chemicals and environmental burden
Journal of Cleaner Production, 2021Co-Authors: Cui ZhangAbstract:Abstract It is important to investigate the feasibility of reclaimed water irrigation for fulfilling cleaner production of salt-tolerant vegetables in coastal Saline Soils which widely distribute in the world. Reclaimed water irrigation might cause the accumulation of endocrine disrupting chemicals in crops although it is a good approach for alleviating water resource shortage. This study firstly investigated the possible cleaner production and benefits of cultivating Mesembryanthemum crystallinum (M. crystallinum) in coastal Saline soil irrigated by simulated reclaimed water. Concentrations of target pollutants including bisphenol A (BPA) and nonylphenol (NP) in root of M. crystallinum were higher than those in stem and leaf while soil salinity could increase the concentrations of BPA/NP in root and decrease those in leaf and stem. The highest concentration of BPA/NP in root of M. crystallinum growing in soil with salt content of 7.2‰ reached 29.28/243.47 μg/kg. BPA mainly accumulated in leaf of M. crystallinum with the highest amount of 621.93 ng under non-Saline conditions while NP mainly accumulated in root with the highest amount of 1114.57 ng under Saline conditions. The hazard quotients sharply decreased by >50% when the soil salinity increased from 1.1‰ to 7.2‰. Non-cancer health risks of BPA and NP in M. crystallinum were acceptable for all human groups while the daily intake of BPA/NP was much lower than the corresponding tolerant daily intake. Life cycle assessment illustrated that M. crystallinum cultivation in soil with salt content of 1.1‰ posed the lowest environmental burden. Salt-tolerant vegetables such as M. crystallinum would be recommended to be cultivated in low-salinity Saline Soils using reclaimed water irrigation due to lower pollutant accumulation and environmental burden to achieve the goals of cleaner vegetable production. These findings provide new insight on the promising potential of reclaimed water irrigation and crop cultivation in Saline Soils in coastal regions.
