| Cite this article: | 张通港,胡行路,罗敏,等.微咸水离子组成对膜下滴灌土壤水盐分布和作物生长的影响[J].灌溉排水学报,0,():-. |
| ZHANG Tonggnag,HU Xinglu,LUO Min,et al.微咸水离子组成对膜下滴灌土壤水盐分布和作物生长的影响[J].灌溉排水学报,0,():-. |
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| Effects of Saline Water with Different Cation Compositions on Water and Salt Distribution and Crop Growth under Mulched Drip Irrigation |
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ZHANG Tonggnag1, HU Xinglu2, LUO Min1, WANG Chun1, YAN Sihui1, CHENG Yu1, LIANG Qing1, FENG Hao1,2, ZHANG Tibin1,2
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1.College of Water Resources and Architectural Engineering,Northwest A F University,Yangling;2.Institute of Soil and Water Conservation,Northwest A F University,Yangling
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| Abstract: |
| Irrigation with saline water is one of the main ways to alleviate the agricultural water crisis in arid areas, and the ionic composition of saline water affects soil properties and crop growth.【Objective】This study aimeds to explore the effects of saline water with different cation compositions on soil pore structure, water-salt transport law and crop growth under mulched drip irrigation.【Method】In this study, corn was planted in the form of drip irrigation under film in Hetao Irrigation District(HID) of Inner Mongolia from April to September in 2021, and field positioning test of brackish water irrigation was carried out. Underground water was taken as a control (CK). The same concentration and different types of chloride salts were added into the groundwater（20 mmolc/L）respectively to form different treatments (NaCl, KCl, CaCl2 and MgCl2, labeled as T1, T2, T3 and T4 respectively). These formed similar conductivity(EC) and different cation composition saline water treatment to study the characteristic changes of soil structure, soil water and salt transport and crop growth response.【Result】The results showed that: (1) Compared with CK, T1 treatment of Na+ significantly increased the number of small pores in the 0~20 cm soil layer, which had adverse effects on soil structure. Therefore, the 0~20 cm water storage of T1 treatment was significantly higher than that of CK, especially in jointing stage with more irrigation. Compared with T1, the small porosity of T3 and T4 decreased by 147.73% and 132.01% respectively. They were beneficial to the development of soil pore structure and water movement, and the surface soil water storage decreased. (2) Compared with CK, T1, T2, T3 and T4 treatments respectively increased the concentrations of Na+, K+, Ca2+ and Mg2+ in 0~60 cm soil of crop root zone. Except for T1, the concentrations of K+, Ca2+ and Mg2+ in T2, T3 and T4 treatments were significantly higher than those in CK. T1 treatment had obvious salt accumulation in the surface soil of crop root zone, and other treatments had no obvious change. On the contrary, the soil salinity of T3 and T4 treatments transported outside the film as a whole, and T4 treatment was more obvious. The electrical conductivity of saturated extract(ECe) in root zone soil was affected by irrigation water EC, which was within 3~4 dS/m. (3) The content of Na+ on the aboveground organs of corn was the lowest. The contents was significantly lower than that of K+, Ca2+, Mg2+ and Cl-. On the contrary, the content of K+ was the highest. The contents of Na+, K+ and Cl-in leaves were higher than those in stems, and the contents of Ca2+ and Mg2+ in leaves were lower than those in stems. Perhaps due to the increase of irrigation amount, several treatments after adding salt increased crop yield. Among them, the corn seeds yield of T4 treatment was the largest, which was 17.33% higher than that of CK.【Conclusion】The irrigation with saline water containing more Na+ increased the small porosity of soil surface, affected the infiltration of soil water. However, more K+, Ca2+ and Mg2+ reduced the small porosity of soil surface, which was beneficial to the leaching of surface salt. Under saline water irrigation, the appropriate concentrations of K+, Ca2+ and Mg2+ in irrigation water were helpful to increase crop dry matter accumulation and final yield formation compared with the significant negative effect caused by more Na+. The research results can provide theoretical basis for safe utilization of underground saline water in HID. |
| Key words: Porosity; Water and Salt distribution; Cation; Corn growth |
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