以盐碱性耕作土壤作为主要研究对象,采用田间试验,设置CK(未施秸秆)、NTS(秸秆免耕覆盖还田)、RTS(秸秆旋耕还田)、PTS(秸秆深翻还田)4个处理,明确秸秆还田方式对土壤理化性质各指标的影响,为秸秆的合理利用提供科学依据.研究结果表明,秸秆还田改善了土壤物理结构,增加了盐碱土含水量和土壤养分.在盐碱土中通过分解有机酸等降低土壤pH值,可实现减蒸抑盐,显著降低0～40 cm 土壤EC值.NTS处理仅作用于土壤表层,RTS处理显著改善了 0～＜20 cm 土层的理化性质,PTS处理在20～40 cm 土层作用更为突出.
Effects of Straw Return Methods on the Physicochemical Properties of Soils in Saline-alkaline Drylands
This study focused on saline-alkaline cultivated soil,using field experiments with four treatments,CK(no straw application),NTS(no-tillage mulching and field return),RTS(rotary tillage and field return)and PTS(deep tilling and field return).The aim was to clarify the effects of straw return on the indexes of soil physicochemi-cal properties,and to provide the scientific basis for the rational utilization of straw.The main results showed that straw returned to the field improved the physical structure of the soil,increased the water content and soil nutrients of saline soil.In saline soil,through the decomposition of organic acids and other substances to reduce soil pH,it can realize the reduction of evaporation and salt suppression,and significantly reduce the EC value of 0-40 cm soil.NTS treatment only acted on the surface layer of the soil,while the RTS treatment significantly improved the physi-cochemical properties of the soil layer of 0-＜20 cm.The PTS treatment had a more pronounced effect on the 20-40 cm soil layer.
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