溶质类型与矿化度对土壤水分扩散率的影响

Effect of solute type and mineralizations on soil moisture diffusivity

以甘肃省秦安县果园石灰性土壤为研究对象,采用水平土柱入渗法,探讨了不同矿化度下(1g/L、3g/L、5g/L、10g/L)的三种钠盐(NaCl、Na2SO4和Na2CO3)对石灰性土壤水分扩散率的影响。结果表明:在水盐复合迁移体系中盐分与水分迁移具有不同步性,影响不同步性的因子与盐分类型有很大关系。NaCl对水分移动速度有促进,但对于水分扩散率有抑制,而Na2SO4和Na2CO3对水分移动速度和水分扩散率均有抑制。盐溶液对土壤基膜特性的影响程度要高于对传输液体特性的影响程度。NaCl和Na2SO4的盐溶液对土壤基膜特性和传输液体特性的影响要比Na2CO3溶液明显。

The unsaturated soil moisture diffusivity is one of the important parametres of studying soil water and salt movement.At present,a few researches have been given more attention to the influence of soil water movement on salt transfer in water and salt complex system,but the study on the constraint relationship of salt transfer to water movement was deficient.Because soil moisture movement parameters were influenced by many factors and the process of soil formation,such as soil texture,soil structure,the con...