【摘要】 <正> 我们在研究华北平原瓦碱形成时,曾作了一些室内的土柱模拟试验,探讨地下水中碳酸钠、重碳酸钠对土壤碱化的影响,发现低矿化地下水中含有的碳酸钠和重碳酸钠明显地影响土壤的碱化过程。由于地下水中重碳酸钠含量的不同和土壤机械组成的差别,使土壤的碱化程度出现显著的差别,为了进一步查清地下水中重碳酸钠含量与不同质地的土更多还原

【Abstract】 This paper deals with the effect of the concentration of sodium bicarbonate in groundwater on the alkalization of soils with different texture. According to the data from soil equilibrium experiment in laboratory, the results are summarized as follows: (1) The concentration of sodium bicarbonate in groundwater which could induce the alkalization of soils was more than 0.1g/1, and the concentration which could induce the formation of solonetz was 0.4g/l. (2) Soils with different texture adsorbed different absolute amounts of sodium from sodium bicarbonate solution of same concentration. The quantity of absorbed sodium by clay soil was more than that by silt loam, but their soil ESP were similar. (3) There was a positive correlation between the dissociated sodium and exchangeable sodium of the soils. (4) It was also found that there was a good correlation between the pH and ESP of the soils.更多还原