| 摘要: |
| 【目的】通过研究不同砂滤料暗管排水对稻田盐碱地土壤水盐运移规律的影响，探明暗管排水最佳的砂滤料，为稻田盐碱地治理提供理论依据。【方法】根据当地暗管排水现状及以往过滤经验，采用对比试验设计，研究细砂粒、细砂粒和细碎石混合（1:2）、细碎石3种不同砂滤料的暗管排水条件下土壤水分、盐分运移规律。【结果】暗管砂滤料采用细砂粒和细碎石（1:2）混合的处理在水稻灌水期可以有效降低0～60cm土壤体积含水率提高土壤脱盐率；在水稻停水晒田期可以有效缓解0～60cm土壤水分流失，抑制土壤返盐。【结论】暗管排水滤料选用细砂粒和细碎石（1:2）混合适宜稻田重度盐碱地治理。 |
| 关键词: 暗管排水；滤料；盐碱地；土壤水分；土壤盐分 |
| DOI： |
| 分类号:S278 |
| 基金项目:国家自然基金“银北灌区节水灌溉与暗管排水耦合对生态环境影响及数值模拟”[51869024]；宁夏重点研发计划重大项目“宁夏现代化生态灌区关键技术集成研究与示范”[2018BBF02022]；国家重点研发项目“黄河上游河套平原节水控盐产能提升技术模式与应用” [2021YFD1900600]；宁夏高等学校一流学科建设项[NXYLXK2021A03] |
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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 |
