Abstract Salt stress severely constrains crop productivity in arid lands of the world. Burying straw at the 40 cm soil depth plus plastic film mulching could mitigate root zone salinity, but little is known about how the thickness of buried straw affects soil water and salt transport. Therefore, a three-year field experiment was conducted from 2010 to 2013 to address this issue, with treatments including: compacted straw thickness of 3 cm (T3), 5 cm (T5), or 7 cm (T7) (corresponding to straw application at rates of 6, 12 and 18 t ha−1, respectively). In addition, a supplementary experiment, which included treatments of no buried straw layer (CK) and 5 cm of compacted straw layer thickness (t5) in the same micro-plot experiment, was carried out from 2014 to 2016 to identify soil pore structure and hydraulic parameters after three years of deep straw burial. Results showed that the initial soil water content increased with increasing thickness but significantly (P T5 > T7. Although T7 had the most pronounced effect on salt mitigation, it was difficult to implement under normal field conditions. Thus, for relatively good water infiltration, salt leaching and inhibition of salt return, straw buried to a thickness of 5 cm is recommended.

中文翻译：

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不同厚度埋藏秸秆改良干燥盐渍土的水盐交换通量及机制

摘要 盐胁迫严重限制了世界干旱地区的作物生产力。将秸秆埋在 40 cm 的土壤深度加上地膜覆盖可以减轻根区盐度，但对埋藏的秸秆厚度如何影响土壤水分和盐分输送知之甚少。为此，2010-2013年进行了为期三年的田间试验以解决这一问题，处理方法包括：压实秸秆厚度为3 cm（T3）、5 cm（T5）或7 cm（T7）（对应秸秆施用）率分别为 6、12 和 18 t ha-1）。此外，在同一微小区试验中，还进行了一项补充试验，包括无埋秸秆层（CK）和 5 cm 压实秸秆层厚度（t5）的处理，于 2014 年至 2016 年进行，以识别经过三年深埋秸秆后的土壤孔隙结构和水力参数。结果表明，初始土壤含水量随着厚度的增加而增加但显着（P T5 > T7。虽然T7对盐分的减缓作用最显着，但在正常田间条件下难以实施。因此，对于较好的水分入渗，盐分浸出和抑制盐分回流，建议将秸秆掩埋至 5 厘米厚。