微咸水灌溉下砂层级配及覆砂厚度对土壤水盐运移的影响

• Published in: Guanʻgai paishui xuebao Vol. 39; no. 9; pp. 7 - 13
• Main Authors: TAN Junli, WANG, Xina, JIN Huijuan, DU Feifei, TIAN Juncang
• Format: Journal Article
• Language: Chinese
• Published: Xinxiang City Chinese Academy of Agricultural Sciences (CAAS) Farmland Irrigation Research Institute Editorial Office of Journal of Irrigation and Drainage 01.09.2020; 宁夏大学土木与水利工程学院,银川750021; 旱区现代农业水资源高效利用教育部工程研究中心,银川750021%宁夏大学农学院,银川750021%宁夏大学土木与水利工程学院,银川750021
• Subjects: Accumulation; Arid zones; Brackish water; Evaporation; Grading; Gravel; Irrigation; Irrigation water; Moisture content; Mulches; Mulching; Salts; Semi arid areas; Semiarid zones; Soil columns; Soil conservation; Soil dynamics; Soil investigations; Soil layers; Soil moisture; Soil surfaces; Soil water; Soil water movement; Thickness; 覆砂厚度; 压砂地; 砂层级配; 水盐分布; 微咸水
• ISSN: 1672-3317
• DOI: 10.13522/j.cnki.ggps.2019222

【目的】探究砂层级配及厚度对微咸水灌溉条件下土壤水盐运移过程的影响机理。【方法】通过土柱模拟试验，研究了微咸水灌溉条件下砂层粗、中及细级配及覆砂厚度为0、5、10、15 cm对土壤水分和盐分运移规律及动态分布的影响。【结果】相同覆砂厚度条件下，砂层级配对土壤水盐分布的影响较小，但中级配（砂层加权直径为5.0 cm）保水效果小于粗级配（砂层加权直径为6.0 cm）及细级配（砂层加权直径为4.5 cm）处理；与不覆砂相比，无论覆砂厚度大或小均能大幅度保蓄土壤水分，抑制土壤盐分表聚；在灌水量相同条件下，覆砂厚度超过10 cm会影响入渗水分的再分布过程。【结论】砂层级配对土壤水盐分布的影响不如砂层厚度大，覆砂即使5 cm也能保蓄较多的水分，抑制表层盐分累积。