秸秆深埋对土壤返盐的抑制作用

Function of Straw Buried on Prevention of Soil Salinization Process

本文以松嫩平原典型苏打盐渍土为对象,采用室内土柱实验方法,分析了稻草秸秆深埋覆盖防止土壤返盐的效果,结果表明:秸秆深埋能有效阻断土壤毛细管作用,切断地下水盐分向地表输送的通道;与实验前相比,对照土壤表层盐度由3.12 d S·m–1增加至3.57 d S·m–1,而秸秆深埋处理土壤盐度并未发生变化,说明秸秆深埋能够有效防止土壤返盐。

A salt-affected soil of Songnen Plain in north-eastern China was selected and a model experimentwas performed using cylindrical soil bins in an indoor test room. A straw layer is provided in the sub-soil. Resultsshowed that the capillarity from groundwater was cut off. Therefore, the rise to the soil surface of salts which weredissolved in the groundwater was prevented. Salinity of surface soil of control treatment increased to 3.57 d S m^–1 from 3.12 d S m^1 While, it was not changed for straw buried treatment. This indicated that buried straw could effec-tively prevent soil salinization.