| 摘要: |
| 在室内模拟试验的基础上，对旱地不同土层土壤气态水扩散特征进行了探讨，初步推断：①在小于最大吸湿量时，土壤中也存在非气态的水分运移，但气态的水分扩散一般是主要机制；②粘粒含量较高、比表面积较大的土壤中非气态水分扩散所占比例较大；③温度升高，扩散系数增大，④扩散也明显存在滞后现象；⑤对供试土样，在相对水气压约40％的含水量下，气态水分扩散系数达最大值。 |
| 关键词: 气态水，扩散系数，滞后现象 |
| DOI： |
| 分类号:S152.7 |
| 基金项目:高等学校博士点基金资助项目 |
|
| The Characteristics of Vaporous Water Diffusion in Soil |
|
Min Ancheng Zhang Yiping
|
| Abstract: |
| Based on the in-lab simulation experiments,the characteristics of vaporous water diffusion in soil samples from different layers in rainfed farmland were discussed with some deductions obtained in the following :(1)there exists a water movement of non-vaporous phase in soil in the case of less than the maximum adsorptive capacity, but the vapor diffusion is the main mechanism in general; (2)the non-vaporous water diffusion consists of greater proportion in soil of high clay content and large specific surface area;(3) when the temperature goes up,diffusion coefficient increasesl;(4)the noticeable hysteresis effect exists in water vapor diffusion ; and(5) vapor diffusion coefficients in the testing soil samples reach the maximum value in the case of vvater content of about 40% of relative vapor pressure. |
| Key words: vaporous water ,diffusion coefficient ,hysteresis |
