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| DOI：10.13522/j.cnki.ggps.2025034 |
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| Effects of brackish water irrigation on root morphology: A review |
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TANG Zhiyi, TAN Junli, SHANG Qian, HAN Gengzhe,
QIAN Zhijin, SUN Jingjing, ZHOU Hui, WANG Xina
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1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China;
2. Engineering Research Center of Efficient Utilization of Modern Agricultural Water Resources in Arid Regions,
Ministry of Education, Yinchuan 750021, China; 3. Ningxia Engineering Research Center for Water-saving Irrigation and
Water Resources Regulation, Yinchuan 750021, China; 4. School of Agriculture, Ningxia University, Yinchuan 750021, China
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| Abstract: |
| 【Background】Soil salinization threatens 37% of global irrigated areas. Since plants can modify their root systems to ameliorate salinity stress, understanding root adaptation under brackish water irrigation is important for sustainable agriculture and saline-alkali soil remediation. This paper reviews the advances and perspectives in this area.【Method】A bibliometric and systematic review was conducted using CiteSpace on 2 773 Chinese publications (1994—2024) from CNKI, and 1 967 English publications (1994—2023) from the Web of Science core database. We systematically examined the response of root morphology of crops with salt tolerance to brackish water irrigation.【Result】Our results showed an increasing research interest in this area. China and the United States lead the world in the area, with diversified and balanced international collaborations. Analysis using the keywords ‘brackish water’, ‘yield’, and ‘subsurface drip irrigation’ found that research associated with these keywords focused on studying the impact of brackish water on root depth, water and nutrient uptake, and root adaptation. Brackish water irrigation resulted in distinct root morphology. In particular, salt-tolerant crops, such as cotton and sunflower, developed deeper roots to access stable deep water and nutrients and avoid high-salinity in the topsoil, whereas salt-sensitive crops, such as rice and soybean, restricted their root growth to the topsoil. We also found that the impact of brackish water on root morphology depended on crop cultivars and soil texture, and that crops adapted to brackish water irrigation by thickening their roots, increasing their root hairs, and altering their root branching.【Conclusion】Brackish water irrigation significantly reshapes root architecture. Crops adapt to brackish water by modifying penetration depth and spatial distribution of their roots. Future research should focus on the genetic and molecular bases of these adaptive responses, as well as their integration with agronomic practices, such as drip irrigation and soil amendments, to improve tolerance of crops to brackish water-induced soil salinity. |
| Key words: brackish water; irrigation; CiteSpace; visual analysis; crop root system; root morphology |
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