| Effects of brackish water irrigation on water and salt transport under mixed sand cover in arid zone of central Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2021.05.18 |
| Key Words: brackish water irrigation mixed sand cover movement of soil water and salt cumulative evaporation Ningxia |
| Author Name | Affiliation | | XU Tianyuan | School of Civil and Hydraulic Engineering, Ningxia University，Yinchuan, Ningxia 750021, China | | JIA Zhenjiang | School of Civil and Hydraulic Engineering, Ningxia University，Yinchuan, Ningxia 750021, China | | LI Wangcheng | School of Civil and Hydraulic Engineering, Ningxia University，Yinchuan, Ningxia 750021, China
Engineering Technology Research Center of Water\|Saving and Water Resource Regulation in Ningxia, Yinchuan, Ningxia 750021, China
Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Yinchuan, Ningxia 750021, China | | ZHAO Guangxing | School of Civil and Hydraulic Engineering, Ningxia University，Yinchuan, Ningxia 750021, China | | GAO Haiyan | School of Civil and Hydraulic Engineering, Ningxia University，Yinchuan, Ningxia 750021, China | | WANG Jie | School of Civil and Hydraulic Engineering, Ningxia University，Yinchuan, Ningxia 750021, China | | ZHAO Xiangyu | School of Civil and Hydraulic Engineering, Ningxia University，Yinchuan, Ningxia 750021, China |
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| Abstract: |
| The water\|salt transport law and dynamic distribution of 0%, 20%, 40%, 60%, 80% and 100% sand mixing ratio under low (2.5 L), medium (3.7 L) and high (5.0 L) brackish water irrigation were studied by setting up micro\|lysimeter. Based on observation of soil, water, and salt distribution, the results indicated that under the same irrigation amount, when the sand mixing ratio was 20% to 100%, the decrease range of accumulated evaporation was 42.22% to 83.07%, the decrease range of surface water content was 0.91% to 28.91%, and the decrease range of deep water content was only -2.14% to 19.25%, increasing the sand mixing ratio significantly promoted the reduction of accumulated evaporation and increased the water content of deep soil, which could improve the agricultural efficiency. The corresponding deep soil salinity increased by 8.41% to 31.9%, and the larger the ratio was, the earlier the peak appeared, and the deeper the position moved. The conclusion manifested that sand and soil mixed mulching effectively reduced soil water evaporation, inhibited salt accumulation, and decreased the secondary harm of micro\|lysimeter irrigation to soil. |
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