| 引用本文: | 刘嘉斌,田军仓,张 萌,等.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,2022,41(11):114-121. |
| LIU Jiabin,TIAN Juncang,ZHANG Meng,et al.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,2022,41(11):114-121. |
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| 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）混合处理在水稻灌水期可以有效降低0~60 cm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0~60 cm土壤水分流失，抑制土壤返盐。【结论】暗管排水砂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；砂滤料；盐碱地；土壤水分；土壤盐分 |
| DOI：10.13522/j.cnki.ggps.2022226 |
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| Effect of Sand Filter in Subsurface Drain on Water and Salt Movement in Paddy Soil |
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LIU Jiabin, TIAN Juncang, ZHANG Meng, WANG Jinpeng, YANG Zhenfeng, ZHAO Guangxing
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1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2. Engineering Technology Research Center of Water-saving and Water Resource Regulation in Ningxia, Yinchuan 750021, China; 3. Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Yinchuan 750021, China
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| Abstract: |
| 【Background and objective】 Saline-alkali soils are widely distributed in Ningxia. Because of the scarcity of precipitation, such soils are often reclaimed by flooding rice field combined with subsurface drain. This paper presents the results of an experimental study of water and salt movement in a paddy field as affected by the sand filter in the subsurface drain.【Method】The field experiment was designed based on our current understanding and previous experimental results of the subsurface drains in different regions across the province. The experiment compared three filters: fine sand, mixture of fine sand and fine gravel sand at 1∶2 ratio and fine gravel. In each treatment, we measured spatiotemporal dynamics of soil water and soil salt.【Result】 The filter with mixture of fine sand and fine gravel at 1∶2 ratio effectively reduced water content in the top 0~60 cm soil, increasing soil desalination during irrigation period as a result. Decrease in water content in the top 0~60 cm soil reduced evaporation, thereby alleviating salt accumulation in the root zone and reliveing salt stress to the crop. 【Conclusion】 The most effective filter for the subsurface drain in the studied paddy field is a mixture of fine sand and fine gavel at 1∶2 ratio. |
| Key words: concealed pipe drainage; filter media; saline soil; soil moisture; soil salinity |
