| Cite this article: | 刘嘉斌.暗管排水砂滤料对稻田盐碱地水盐运移规律的影响[J].灌溉排水学报,0,():-. |
| liu jiabin.暗管排水砂滤料对稻田盐碱地水盐运移规律的影响[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Effect of Subsurface Drainage Sand Filter Material on Water and Salt Migration in Paddy Field |
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liu jiabin
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School of Civil and Hydraulic Engineering, Ningxia University,
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| Abstract: |
| 【Background】There are a large number of saline-alkali lands in Ningxia, which are not conducive to the growth and development of crops, and will result in a large area of crop yield reduction or even extinction, and seriously restrict the sustainable development of agriculture in China. For arid areas with little rainfall and heavy salinization, underground drainage combined with paddy field inundation can reduce soil salinity to the greatest extent and realize the improvement and utilization of salinization land.【Objective】By studying the effects of dark pipe drainage with different sandy filter media on the water and salt transport pattern of paddy saline soil, the best filter media for dark pipe drainage was sought to provide a theoretical basis for paddy saline land management. 【Method】According to the current situation of local dark pipe drainage and previous filtration experience, a comparative experimental design was used to analyze and study the soil water, groundwater level and soil salt transport laws under dark pipe drainage conditions with three different filter media: fine sand grain, fine sand grain and fine gravel mixture (1:2) and fine gravel. 【Result】The mixed treatment of fine sand and fine crushed stone (1:2) in the subsurface sand filter material could effectively reduce the volumetric water content of 0 – 60 cm soil and improve the soil desalination rate rice irrigation period. The soil moisture loss at 0 – 60 cm depth could be effectively alleviated and soil salt return could be inhibited during the period of rice water retention and field drying. 【Conclusion】Dark pipe drainage filter media selection of fine sand grains and fine gravel mix (1:2) is suitable for heavy saline land management in rice fields. |
| Key words: concealed pipe drainage;filter media;saline soil;soil moisture;soil salinity |
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