不同土壤温度和容重下微咸水上升毛管水

为探索西北干旱地区不同质地土壤以及土壤温度和容重对微咸水上升毛管水运动特性的影响，通过模拟和室内试验，研究了土壤温度和容重对砂壤土和粉壤土上升毛管水运动特性的影响。分别建立了地下水补给量与土壤温度和容重之间的模型，毛管水上升高度与土壤温度和容重之间的模型，其中地下水补给量模型，砂壤土的绝对系数均达到0.96以上，计算值与模拟值最大相对偏差小于10.9%，粉壤土的绝对系数均达到0.96以上，计算值与模拟值最大相对偏差小于8.4%，毛管水上升高度模型，砂壤土的绝对系数均达到0.996以上，计算值与模拟值最大相对偏差小于8.37%，粉壤土的绝对系数均达到0.997以上，计算值与模拟值最大相对偏差小于11.9%，模型拟合程度较好，所建立方程符合实际情况。砂壤土盐分主要聚集在距地表1.70~2.20 m处，粉壤土盐分主要聚集在距地表0.3~1.3 m处，砂壤土土壤盐分分布受土壤温度和容重的影响较显著，而粉壤土土壤盐分分布受其影响并不显著。该研究结果可为盐碱化地区水盐管理提供科学依据。

Simulation and Verification of Movement Characteristics of Upward Capillary Water Flow of Saline Water in Soils with Different Soil Temperatures and Bulk Densities Using HRDRUS

To explore the effects of soil texture, soil temperature and bulk density on movement characteristics of upward capillary water flow of saline water in soil of northwest arid region, a lab simulation experiment was conducted in sandy loam and clay loam by HYDRUS-1D. The models of ground water recharge of capillary water with soil temperature and bulk density of were built. For sandy loam, the absolute coefficient was above 0.96, RMSE was less than 0.95 cm, and the maximum relative deviation between the calculated and simulated values was less than 11.9%, while the corresponding values were 0.96, 4.3 cm and less than 8.4% respectively in clay loam. The models of rising height of capillary water with soil temperature and bulk density were also built. For sandy loam, the absolute coefficient was above 0.996, RMSE was less than 2.7 cm and the maximum relative deviation between the calculated and simulated values was less than 8.37%, and the corresponding values were 0.997, less than 3.8 cm and less than 11.9% respectively for clay loam. The fitting degree of the model was good, and the equation established was in line with the actual situation. The salt contents of sandy loam mainly gathered at 1.70~2.20 m from the surface, while 0.3~1.3 m for clay loam. The distribution of soil salinity in sandy loam soil was significantly affected by soil temperature and bulk density, but only soil bulk density worked in clay loam and temperature had little effect. To summarize, these research results could provide scientific foundation for water and salt management in salinized area.