| 摘要: |
| 研究了不同温度下,土壤水势(ψ)和土壤含水量对土壤水分运动的影响。结果表明,在相同温度下,提高ψ(或增加土壤含水量)可提高非饱和土壤导水率(K),并有黄绵土>塿土的趋势。根据 K的对数值与ψ拟合出线性方程,在生产实践中测定ψ值,用此方程可计算出K值,随着土壤含水量增加,K也提高,且呈正相关 ,在同一土壤含水量条件下,增加温度可提高K,增加幅度塿土>黄绵土。由K对数值与温度(t)回归出线性方程可看出,塿土和黄绵土的水势温度效应(dψ/dt)与K温度效应(dlnK/dt)随ψ增加而降低。 |
| 关键词: 非饱和导水率,土壤水势,温度,导水率温度效应(dlnK/dt) |
| DOI： |
| 分类号:S152.7 2 |
| 基金项目:国家自然科学基金资助项目(48970035) |
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| Effect of temperature on unsturated soil water movement |
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LIUSi-chun ZHANG Yi-ping ZHU Jian-chu MA Ai-sheng
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| Abstract: |
| The effect of temperature on unsaturated soil water movement is studied in this paper.The results indicate: (1)At the same temperature, unsaturated soil water conductivty is increased as soil water potential increases, which shows a positive correlation. The increment in Huangmian soil is more than that in Lou soil. There is a linear relation between soil water potential and unsaturated soil water conductivity logarithm.Thus, the unsaturated soil water conductvity can be calculated with observed soil water potential by this way. (2) At the same soil water content, unsaturated soil water conductivity is decreased as the temperature increases.The increment in Lou soil is more than that in Huangmian soil. The soil water potential temperature effect (dψ/dt) and unsaturated soil water conductivity temperature effect (dln K/dt) of these two soils are decreased with soil water content increasing. |
| Key words: unsaturated water conductivity,soil water potential,temperature,conductivity temperature effect (dln K/dt) |
