Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34639
標題: 土壤水分特性曲線參數與物理性質關係之研究
Relationship of Soil Water Characteristic Curve Parameters and Soil Physical Properties
作者: Hunz, ching-Hui
洪靖惠
關鍵字: Pressure plate experiment;壓力鍋;Water characteristic curve;van Genuchten Model;Multiple regression;Parameter α;Parameter n;水分特性曲線;van Genuchten模式;複迴歸分析;α參數;n參數
出版社: 水土保持學系所
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摘要: 
本研究利用室內壓力鍋排水實驗,求取台灣地區13種不同土壤樣本之土壤水分特性曲線,土壤樣本質地包括砂土、砂質壤土、壤土、粘質壤土、粘土。室內試驗所得土壤水分含量與壓力勢能之關係,利用van Genuchten Model 擬合,得到水分特性曲線方程式之水力特性參數α、n值。將水力參數α、n值,採用SPSS軟體以複迴歸分析方法,以土壤物理性質作為變數,歸納出土壤基本物理性質與參數α、n值關係之推估方程式。另外採集3種土壤樣本作為推估方程式之驗證土樣,探討推估式的適用性。並界定不同質地土壤van Genuchten Model 參數之適用範圍。
研究結果顯示,利用六種土壤基本性質包括總體密度、孔隙率、田間容水量、砂粒百分比、粘粒百分比、有機質含量。進行迴歸分析得到的α推估式及n值推估式,以壤土繪成之水份特性曲線最佳,其次是砂質壤土,粘質壤土較差。推估式表示如下:
ln(α)=1.228BD+8.226*10-2f-5.868*10-2FC+4.86*10-2sand+2.885*10-2clay+0.233C-12.743
ln(n)=2.239BD+4.49*10-2f-1.243*10-2FC+4.254*10-3sand+9.193*10-3clay+1.397*10-2C-4.838
本研究中,壓力鍋排水曲線得到的水力特性參數α值,砂土為0.002734cm-1、砂質壤土介於0.001695~0.014591cm-1、壤土介於0.000460~0.002804cm-1、粘質壤土介於0.000292~0.017212cm-1、粘土介於0.000247~0.000447cm-1之間。由於本研究土樣得到之n參數,與質地沒有明顯的相關性,因此不界定n值在不同質地之範圍。

This study used the pressure plate experiment to obtain soil water characteristic curves in the laboratory. Thirteen soil samples includeng sand, sandy loam, loam, clayey loam, and clay used to establish the relationship of soil water content and pressure potential. The parameters α and n of the van Genuchten Model were obtained by curve fitting technique. Multiple regression equations were estimated using soil physical properties and statistical SPSS software. Three soil samples were used to validate suitability of the equations. This study also defined the range of the equation parameters for different soil texture in Taiwan.
Six soil physical properties including bulk density, porosity, field capacity, percent of sand, percent of clay, organic matter content were correlated with α and n parameters of the van Genuchten model. Regression analysis results showed that the equation parameter α and n related the best with the loamy soil water characteristic curve, followed by sandy loam, and clay loam. The estimated regression equation were as follows:
ln(α)=1.228BD+8.226*10-2f-5.868*10-2FC+4.86*10-2sand+2.885*10-2clay+0.233C-12.743
ln(n)=2.239BD+4.49*10-2f-1.243*10-2FC+4.254*10-3sand+9.193*10-3clay+1.397*10-2C-4.838
The range of the van Genuchten Model for parameter α is as 0.002734 cm-1 for sand;0.001695~0.014591cm-1 for sandy loam;0.000460~0.002804cm-1 for loam;0.000292~0.017212cm-1 for clay loam;0.000247~0.000447cm-1 for clay. Due to the parameter n was not significantly related to soil texture, its range, therefore, was not defined in this study.
URI: http://hdl.handle.net/11455/34639
其他識別: U0005-0707200813013900
Appears in Collections:水土保持學系

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