冻融期地下水浅埋条件下不同质地土壤中水、热、盐迁移规律研究OA
Study on Migration Patterns of Water,Heat and Salt in Variably Textured Soils Under a Shallow Groundwater Table During the Freeze-thaw Period
冻融作用是影响地下水浅埋区春季表层土壤盐渍化的关键因素,但不同质地土壤在冻融期的水热盐迁移规律尚不明确.为揭示地下水浅埋条件下不同质地土壤冻融期水热盐迁移特征,在地下水埋深1.0 m条件下设置沙壤土、壤沙土和沙土3种土壤蒸渗仪,监测2024-2025年冻融期0～60 cm土层水热盐变化.结果表明:壤沙土和沙土地表温度随气温的下降较快,沙壤土降温速率慢,但冻结深度最大,达44.54 cm.3种质地土壤0～60 cm储水量均呈先升后降,上升持续时间随土壤颗粒粒径增大而缩短,仅沙土含水率在冻融期结束后上升,其中沙壤土和壤沙土的聚墒区位于10～30 cm,沙土的聚墒区位于10～20 cm.沙壤土、壤沙土和沙土均呈现先脱盐后积盐,盐分聚集区依次为0～5、0～10和0～20 cm,粗颗粒土壤盐分聚集厚度大,细颗粒土壤则聚集区含盐量高.3种质地土壤0～60 cm储盐量在冻融期整体增加并与水分耗散量呈负相关,土壤颗粒粒径越大地表积盐程度越大.并且土壤储盐量时间变异系数均高于储水量,表明在0～60 cm剖面上,盐分受冻融作用的影响大于水分,其中壤沙土储水量与储盐量时间变异系数最高,受冻融作用影响最大.
Freeze-thaw processes are a key factor controlling spring surface soil salinization in areas with shallow groundwater,but the migration patterns of water,heat,and salt in soils of different textures during the freeze-thaw period remain unclear.To characterize these patterns under shallow-groundwater conditions,three lysimeters filled with sandy loam,loamy sand,and sand were established with a groundwater table depth of 1.0 m,and changes in water,heat,and salt in the 0～60 cm soil layer were monitored during the 2024-2025 freeze-thaw period.The results showed that the surface temperatures of the loamy sand and sand decreased more rapidly with falling air temperature than that of the sandy loam,whereas the sandy loam had the greatest freezing depth,reaching 44.54 cm.For all three soil textures,the 0～60 cm soil water storage first increased and then decreased,and the duration of the increase shortened as soil particle size increased.Only the sand exhibited an increase in water content by the end of the freeze-thaw period.The water-accumulation zone was located at 10～30 cm in the sandy loam and loamy sand,and at 10～20 cm in the sand.Sandy loam,loamy sand,and sand all showed a pattern of initial desalinization followed by salt accumulation,with salt-enriched layers at 0～5,0～10 and 0～20 cm,respectively.Coarser-textured soils developed thicker salt-enriched layers,whereas finer-textured soils exhibited higher salt concentrations within the accumulation zone.For all three textures,salt storage in the 0～60 cm layer increased overall during the freeze-thaw period and was negatively correlated with water loss,and surface salinization intensified with increasing particle size.The temporal coefficients of variation of salt storage were higher than those of water storage,indicating that salt storage in the 0～60 cm profile was more strongly affected by freeze-thaw processes than water storage.Among the three soils,loamy sand showed the largest temporal variations in both water and salt storage,suggesting the strongest sensitivity to freeze-thaw action.
孟强;陈军锋;崔莉红;薛静;杜琦;杨晓俊
太原理工大学水利科学与工程学院,山西 太原 030024||流域水资源协同利用山西省重点实验室,山西 太原 030024太原理工大学水利科学与工程学院,山西 太原 030024||流域水资源协同利用山西省重点实验室,山西 太原 030024太原理工大学水利科学与工程学院,山西 太原 030024||流域水资源协同利用山西省重点实验室,山西 太原 030024太原理工大学水利科学与工程学院,山西 太原 030024||流域水资源协同利用山西省重点实验室,山西 太原 030024山西省水文水资源勘测总站太谷均衡实验站,山西 晋中 030600山西省水文水资源勘测总站太谷均衡实验站,山西 晋中 030600
农业科技
冻土区土壤质地土壤水分土壤温度土壤盐分地下水埋深
frozen soil regionsoil texturesoil moisturesoil temperaturesoil salinitygroundwater table depth
《节水灌溉》 2026 (5)
1-7,16,8
国家自然科学青年基金项目(41502243)山西省自然科学基金面上项目(202203021221048)山西省自然科学青年基金项目(202203021212195)山西省水利技术研究推广补助项目(2024GM14).
评论