本文選題：鹽漬土 + 未凍水��； 參考：《水土保持學報》2017年02期

【摘要】：為探討鹽漬化土壤在凍融過程中孔隙水及未凍水含量的變化規(guī)律,運用核磁共振儀(NMR)測定了不同鹽漬土與不同NaCl飽和試樣的孔隙水及未凍水含量,同時研究了不同土質對凍結過程中未凍水含量的影響,分析了凍融過程中的滯后現象。試驗設置8個處理,即輕度鹽漬化粉砂壤土、中度鹽漬化壤土2種土壤類型和蒸餾水、0.2%、0.6%、1.0%NaCl 4種溶液。結果表明:(1)在鹽漬土凍結過程中,大孔隙降幅速率小孔隙降幅速率,而鹽漬土的融解先從小孔隙開始。(2)無論是輕度鹽漬土還是中度鹽漬土,1.0%NaCl飽和溶液的未凍水含量最大。飽和溶液為1.0%NaCl的中度鹽漬土在凍融過程中出現二次突變,其二次突變溫度點不一樣,融解時二次突變溫度高于凍結時二次突變溫度。(3)比較不同土質對凍融過程中未凍水含量可知,壤土未凍水含量粉砂壤土未凍水含量。在凍融過程中,結合T_2分布曲線可知,孔隙水的減少先從大孔隙開始,孔隙水的增多先從小孔隙開始;NaCl飽和溶液的濃度越高,其未凍水含量越大,凍結溫度越低;不同土質對土壤未凍水含量有所影響,壤土的未凍水含量明顯高于粉砂壤土的未凍水含量;鹽漬土壤在凍結和融化過程中存在滯后現象,在凍融過程中的滯后現象明顯區(qū)間,隨濃度的增大,所處的溫度范圍有降低趨勢。
[Abstract]:In order to study the change rule of pore water and unfrozen water content in salinized soil during freezing and thawing, the pore water and unfrozen water content of different saline soil and different NaCl saturated samples were measured by NMR.At the same time, the influence of different soil quality on the content of unfrozen water in freezing process was studied, and the lag phenomenon in freezing and thawing process was analyzed.Eight treatments were set up in the experiment, that is, mildly salinized silt loam, moderate salinized loam, two soil types and distilled water 0.20.20.0.0.10% NaCl solution.The results show that in the freezing process of saline soil, the decreasing rate of large porosity is small, while the melting of saline soil begins with small pore. 2) the content of unfrozen water in saturated solution of 1.0 NaCl is the largest in mild saline soil and moderate saline soil, regardless of whether it is mild saline soil or moderate saline soil.In the process of freezing and thawing, a secondary mutation occurs in the medium salinized soil with saturated solution of 1.0%NaCl, and the temperature of the secondary abrupt change is different.The second mutation temperature during melting was higher than that during freezing. (3) the unfrozen water content of loam and silty loam was compared with the content of unfrozen water in different soil quality during freezing and thawing process, which indicated that the content of unfrozen water in silty loam was higher than that in frozen soil.In the process of freeze-thaw, combined with the distribution curve of T _ 2, it can be seen that the decrease of pore water starts from the macropore, the increase of pore water begins with the increase of the concentration of NaCl saturated solution, the higher the content of unfrozen water is, the lower the freezing temperature is.The content of unfrozen water in loam is obviously higher than that in silt loam, and the lag in freezing and thawing of salinized soil is obvious, and the lag in freezing and thawing is obvious in the process of freezing and thawing, and the content of unfrozen water in loam is obviously higher than that in silt loam.The temperature range decreases with the increase of concentration.
【作者單位】： 內蒙古農業(yè)大學水利與土木建筑工程學院;
【基金】：國家自然科學基金項目(51369018);國家自然科學基金重點項目(51539005) 教育部留學回國人員科研啟動基金項目([2013]693) 內蒙古自治區(qū)第五批“草原英才”工程項目([2015]56)
【分類號】：S155.293

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