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| DOI：10.13522/j.cnki.ggps.2021189 |
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| The Changes in Depth and Physicochemical Properties of Groundwater in Response to Spring Irrigation in Hetao Irrigation District |
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LIU Zuting, WANG Liping, QU Zhongyi, et al.
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1. Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Wuyuan County Agriculture and Husbandry Extension Center, Bayannur City, Inner Mongolia, Bayannur 015100, China
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| Abstract: |
| 【Objective】Irrigation in Hetao Irrigation District relies on water diverted from the Yellow River, and it has a direct consequence for physicochemical properties of both soil and groundwater. The purpose of this paper is to study the impact of spring irrigation on depth and physicochemical properties of the groundwater. 【Method】The experiment was conducted on a saline-alkali soil. We measured the changes in groundwater table, typical cation and anion ions, EC, pH, and other factors in the groundwater before and after the spring irrigation. The impacts of the irrigation on changes in groundwater depth and its physicochemical properties were analyzed using statistical methods. 【Result】The irrigation increased the concentrations of TDS, Ca2+ , K+ + Na+ , SO42- and Cl-, especially K+ + Na+ + and Cl- which not only had the largest coefficient of variation but also varied most erratically over space. Along with rock weathering and evaporation crystallization, cation exchange was another factor that modulated the change in chemical composition of the groundwater. After the irrigation, chemical composition of the groundwater shifted from Na-Mg-Cl-SO4-HCO3 type and Na-Cl-SO4-HCO3 to Na-Cl-SO4 type. Depending on irrigation amount and region, it took 10~20 day for the groundwater to respond to the irrigation, with the groundwater table rising by 1.197~2.142 m at a daily rate 0.079 8~0.169 m/d. 【Conclusion】 Spring irrigation increased the average TDS content of grounded by 15.6%, indicating a salt leaching, but it also raised the groundwater table giving rise to soil salinity. Therefore, to alleviate soil salinization, spring irrigation amount should be reduced, and drainage system should be improved in the region. |
| Key words: saline-alkali soil; water diversion from the Yellow River for spring irrigation; groundwater salinity; groundwater depth |
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