土壤表层碱性盐逐渐积累、交换性钠离子饱和度逐渐增高的现象。
灌溉黄灌水、小黑河水能使土壤碱化，但未形成碱土。
Because it is not make the soil alkaline, but also turn the soil salined.
结合土柱试和盆栽试验的结果综合分析，在土壤碱化度低于30%的轻、中度碱化土壤通过水利与农业措施相结合的办法而不用化学改良剂就可以改良好；
Combinating the siol column and potted plant experiment synthesize analysis that the soil alkalinity below 30% can be all improved by hydraulic and agricultural measure without the chemical amendment.
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