Effects of Groundwater Level Control on Soil Salinity Change in Farmland around Wetlands in Arid Areas: A Case Study of the Lower Reaches of the Shiyang River Basin, China
Abstract
:1. Introduction
2. Materials and Methods
2.1. Overview of the Study Area
2.2. Experimental Design
2.3. Data Acquisition
2.4. Data Processing
3. Results
3.1. Changes in Groundwater Depth
3.2. Changes in Soil Bulk Salt Content before and after the Control Period
3.3. Changes in the Pore Water Electrical Conductivity of the Topsoil during the Groundwater Control Period
3.4. Changes in the ECp of the Topsoil in the Concentration Stage
3.4.1. Change Characteristics of the ECp of the Topsoil
3.4.2. Analysis of Moisture and Salt Equilibrium in Topsoil Solution
4. Discussion
5. Conclusions
- (1)
- Under the continuous action of groundwater control system in summer with high temperature in arid regions, the groundwater depth increases in the control zone and the depth of the salt accumulation layer moves down, creating a suitable topsoil salt environment for crop growth.
- (2)
- On an irrigation cycle scale, the groundwater control system contributes to the significant decrease in the increased amplitude of the topsoil ECp in the concentration stage of the topsoil solution, especially 3–8 days after irrigation.
- (3)
- The groundwater control system mitigates the concentration rate of the topsoil solution by increasing the groundwater depth, reducing salt transport amount from the groundwater to the topsoil and influencing the water and salt equilibrium of the topsoil solution. In the concentration stage of the soil solution, in the control zone both the moisture content and salt content of the topsoil solution are in negative equilibrium and in the non-control zone the moisture content and salt content of the topsoil solution are in negative and positive equilibrium, respectively.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Depth/cm | Control Zone | Non-Control Zone | ||||
---|---|---|---|---|---|---|
2 Days after Irrigation | 10 Days after Irrigation | Variable Quantity | 2 Days after Irrigation | 10 Days after Irrigation | Variable Quantity | |
20 | 28.32 | 21.32 | −7.00 | 29.50 | 22.90 | −6.60 |
40 | 30.91 | 21.57 | −9.34 | 30.99 | 27.02 | −3.96 |
60 | 31.34 | 25.36 | −5.98 | 31.30 | 28.59 | −2.71 |
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Liu, P.; Zhang, G.; Cui, S.; Nie, Z.; Cui, H.; Wang, Q. Effects of Groundwater Level Control on Soil Salinity Change in Farmland around Wetlands in Arid Areas: A Case Study of the Lower Reaches of the Shiyang River Basin, China. Water 2023, 15, 1308. https://doi.org/10.3390/w15071308
Liu P, Zhang G, Cui S, Nie Z, Cui H, Wang Q. Effects of Groundwater Level Control on Soil Salinity Change in Farmland around Wetlands in Arid Areas: A Case Study of the Lower Reaches of the Shiyang River Basin, China. Water. 2023; 15(7):1308. https://doi.org/10.3390/w15071308
Chicago/Turabian StyleLiu, Pengfei, Guanghui Zhang, Shangjin Cui, Zhenlong Nie, Haohao Cui, and Qian Wang. 2023. "Effects of Groundwater Level Control on Soil Salinity Change in Farmland around Wetlands in Arid Areas: A Case Study of the Lower Reaches of the Shiyang River Basin, China" Water 15, no. 7: 1308. https://doi.org/10.3390/w15071308
APA StyleLiu, P., Zhang, G., Cui, S., Nie, Z., Cui, H., & Wang, Q. (2023). Effects of Groundwater Level Control on Soil Salinity Change in Farmland around Wetlands in Arid Areas: A Case Study of the Lower Reaches of the Shiyang River Basin, China. Water, 15(7), 1308. https://doi.org/10.3390/w15071308