摘要
本试验采用水平土柱法对三种滨海盐渍土的非饱和土壤水扩散率进行的研究结果表明:三种土壤的非饱和土壤水扩散率变化于0.14～117.32cm^2·min^(-1)之间,比非饱和土壤的离子扩散率大几个数量级;非饱和土壤水扩散率随土壤含水量的增加而升高,符合 D(θ)=ae^(bθ)经验公式;含水量与 Boltzmann 变换参数λ之间的关系为(λ)随含水量的下降而降低;在质地相同的情况下,土壤容重和土壤孔隙度均对非饱和土壤水扩散率有很大的影响,但土壤盐分浓度在含水量达0.2cm^3·cm^(-3)以上时对非饱和土壤水扩散率影响不大。
The method of horizontal earth column was used to study the unsaturated soil water diffusivity of three seashore saline soils.The results were as follows.①The unsatu- rated soil water diffusivity of the three seashore saline soils was about between 0.14～117. 32 cm^2·min^(-1).The value of the unsaturated water diffusivity is several numeral classes more than value of unsaturated soil ion diffusivity.②The unsaturated soil water diffusivi- ty of the three seashore saline soils increased with soil water content.The relationship a- grees to D(θ)=ae^(bθ)experimental equation.③Boltzmann alternate parameter(λ)decreased with the soil water content.④The unsaturated soil water diffusivity was affected by the bulk density,porosity when the texture was alike,but it was not affected by the soil salt concentration when soil moisture content was above 0.2 cm^3·cm^(-3).
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1997年第S1期70-74,共5页
Journal of China Agricultural University
关键词
非饱和土壤水扩散率
滨海盐渍土
水平土柱法
unsaturated soil water diffusivity
seashore saline soil
the method of horizontal earth eolumn
