摘要
土壤水分运动参数的确定对土壤水分研究具有重要意义。野外测定土壤水分运动参数理论上可以使用瞬时剖面法，但是该法在野外实施时遇到许多困难。作者利用自己研制的高精度野外下渗仪，结合γ透射法测定下渗剖面、张力计测量原状土壤水分特征曲线，所得试验数据根据瞬时剖面法原理计算出导水率Ｋ（θ）、扩散率Ｄ（θ），通过水量平衡分析验证，使参数的可靠性、正确性得到了保证。
Parameters determination is essential to soil water movement study by mathematical mod-els. Theoretically,the parameters can be measured in the field by the method of instantaneous section,but it is difficult to practice. The high precision infiltration meter made by ourselves was used togetherwithγ-ray and tensiometer to measure the infiltration section and the characteristic curve of soil watermovement in the field,which could be used to calculate the conductivity K(θ)and diffusivity D(θ)ofthe soil on-the-spot.The parameters could be verified by water balance analysis to ensure the reliabilityand validity of them.
出处
《水土保持学报》
CSCD
北大核心
1994年第1期69-72,77,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金
关键词
土壤水分运动
参数野外确定
soil water movement parameters determination in the field
