土壤盐－水动力学：Ⅳ.水分蒸发与渗漏时土壤剖面离子组成的变化

Through a simulation test carried out with soil columns(61.8 cm in diameter),the changes of ionic compositon in soil profile during the processes of water evaporation and infiltration were studied.Under evaporation conditions,ions moving upward with fresh groundwater were mainly Cl^-1,SO4^2-,Ca^2 ,and Na^ .When the mineralized groundwater took part in the salt accumulation.the ionic composition in soils was close to that in ground water supplemented.Under rainfall infiltration conditions,the salt-leaching role occurred mainly in the top soil.With the decrease of total salt content,NO3^-and Cl^- reduced rapidly,SO4^2- decreased slowly,but HCO3^- had a little change only.Among cations,Na^ and Ca^2 contents lowered at the same speed,and mg^2 decreased slowly.

Salt-water dynamics in soils: IV. Changes of ionic composition in soil profiles during water evaporation and infiltration

Through a simulation test carried out with soil columns(61.8 cm in diameter),the changes of ionic compositon in soil profile during the processes of water evaporation and infiltration were studied.Under evaporation conditions,ions moving upward with fresh groundwater were mainly Cl^-1,SO4^2-,Ca^2 ,and Na^ .When the mineralized groundwater took part in the salt accumulation.the ionic composition in soils was close to that in ground water supplemented.Under rainfall infiltration conditions,the salt-leaching role occurred mainly in the top soil.With the decrease of total salt content,NO3^-and Cl^- reduced rapidly,SO4^2- decreased slowly,but HCO3^- had a little change only.Among cations,Na^ and Ca^2 contents lowered at the same speed,and mg^2 decreased slowly.