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標題: The Study of Soil Residual Water Content Measurements
作者: 林湘芸
Xiang-Yun Lin
關鍵字: 土壤水分特性曲線;殘餘水分含量;壓力鍋;Soil water characteristic curve;Soil residual water content;Pressure plate experiment
引用: 1. 林俐玲、洪靖惠、蔡義誌(2008),「壓力鍋排水試驗張力平衡時間之研究」,水土保持學報,40(4):493-504。 2. 林俐玲、董小萍(1996),「土壤物理學實習手冊」,國立中興大學水土保持學系。 3. 洪靖惠(2008),「土壤水分特性曲線參數與物理性質關係之研究」,國立中興大學水土保持研究所碩士論文。 4. 陳威竹(2013),「應用土壤粒徑分布模式推估土壤水分特性曲線之研究」,國立中興大學水土保持研究所碩士論文。 5. 曹舜評、張圖杰(2011),「砂箱不同剩餘水分之土壤水分特性曲線推估」,坡地防災學報,10(1):50-58。 6. 蔡義誌(2008),「不飽和土壤水力傳導度與介質孔隙分佈關係之研究」,國立中興大學水土保持研究所博士論文。 7. 萬鑫森 譯(1987),「基礎土壤物理學」,初版二印,國立編譯館主編,茂昌圖書有限公司發行。 8. Brooks, R.H. and A.T. Corey (1964). Hydraulic properties of porous medium. Colorado State University(Fort Collins), Hydrology Paper, Nr. 3, March. 9. Cornelis, W. M., J. Ronsyn, M. van Merivenne, and R. Hartmann (2001). Evaluation of pedotransfer function for predicting the soil moisture retention curve. Soil Sci. Soc. Am. J. 65: 638-648. 10. Fredlund ,D.G. , and A. Xing. (1994). Equations for the soil-water characteristic curve. Canadian Geotechnical Journal, 31(3):521-532. 11. Hillel, D. (1980). Fundamentals of Soil Physics, Academic Press, New York. 12. Briggs, Lyman J., and H. L. Shantz (1912). The wilting coefficient and its indirect determination. Botanical Gazette(Chicago Journal),53(2):20-37. 13. Poeplau, C., J. Eriksson, and T. Katterer (2015). Estimating residual water content in air-dried soil from organic carbon and clay content. Soil & Tillage Research 145: 181-183. 14. Seybold, C. A. and D. S. Harms (2012). Estimation of-1500 kPa Water Retention in Soil Survey. Soil Science 177(4): 229-235. 15. Suwandi, A. K., R. A. Assis, R. P. Marlina, (2009),Determination of Alternative Method for Clay Soil Moisture Content. Malaysian Technical Universities Conference on Engineering and Technology,June 20-22, 2009. 16. van Genuchten, M. Th. (1980). A closed-form equation for predicting the hydraulic conductivity of unsaturated Soils. Sci. Soc. of Am. J., 44:892-898. 17. Waldchen, J., I. Schoning, M. Mund, M. Schrumpf, S. Bock, N. Herold, K. U. Totsche and E. D. Schulze(2012). Estimation of clay content from easily measurable water content of air-dried soil. Journal of Plant Nutrition and Soil Science 175(3): 367-376.
研究結果顯示,風乾實驗中,風乾36小時之水分含量可視為殘餘水分含量; 烘乾實驗中,烘乾5小時之水分含量可視為殘餘水分含量。若欲以迴歸式進行殘餘水分含量之推估則土樣經由風乾法及烘乾法實驗所得水分含量與殘餘水分含量之最佳迴歸方程式如下
θ_r=-0.6531θ_(air-dried(12hr))^2+1.1123θ_(air-dried(12hr) )+0.1421
θ_r=-2.2758θ_(oven-dried(9hr))^2+1.3511θ_(oven-dried(9hr) )+0.151


The relationship between soil moisture content and matric potential in general were described by soil water characteristic curve(SWCC). As the difference in soil texture and structure, it may show different soil hydraulic properties and water retention curve.
For realizing a soil water characteristic curve often takes the experimentally by direct measurement, the process is cumbersome and time-consuming. If the survey areas covered a large range, the experimental procedure and time will take even more.
Soil residual water content is an important factor to determine soil water characteristic curve. 30 kinds of soil samples from different areas were conducted in this study. Three methods of residual water content measurements namely pressure plate experiment, air-dried and oven-dried(50∘C) method to define soil residual water content were applied. Regarded the 15 bar water content of pressure plate experiment results as the true value, comparing with the results of air-dried and oven-dried method.
The results showed that, moisture content of air-dried 36 hours and oven-dried 5 hours can be regarded as residual water content.
The regression equation with residual water content value of air-dried and oven-dried soil data were as follows:
Air-dried method:
θ_r=-0.6531θ_(air-dried(12hr))^2+1.1123θ_(air-dried(12hr) )+0.1421
Oven-dried method:
θ_r=0.8883θ_(oven-dried(9hr) )+0.1669
Among the three kinds of measurement methods, oven-dried method is time-saving and more accurate than air-dried method. So if in case of shortage of time and labor situation, oven-dried method can be used to replace the pressure plate experiment to determine the residual water content.
其他識別: U0005-2907201515343000
Rights: 同意授權瀏覽/列印電子全文服務,2018-08-14起公開。
Appears in Collections:水土保持學系

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