秸秆双层覆盖对盐碱地水盐运动影响初步研究

发布时间：2018-02-10 04:17

本文关键词： 秸秆表层覆盖深层覆盖双层覆盖蒸发量盐分　出处：《土壤学报》2017年06期 　论文类型：期刊论文

【摘要】：采用室内土柱模拟的方式,研究了秸秆双层覆盖对盐碱土的改良效应及机制,以期对盐碱地的改良提供理论依据。结果表明:1)与对照相比,不同的秸秆覆盖模式均能降低土壤水分的累积蒸发量,T4处理(土表与土表下35~40 cm处覆盖秸秆量之比为2∶1)在45 d内土壤水分累积蒸发量较CK(无秸秆覆盖的对照)低36.73 mm,抑蒸率为65.89%,抑蒸率最大,对土壤水分蒸发的抑制效果最好。2)秸秆处理均在不同程度上抑制了土壤返盐,其中T4处理返盐率最小,远低于对照处理。3)土壤水分累积蒸发量与土壤累积含盐量存在高度正相关关系。4)秸秆双层覆盖对土壤水分蒸发和土壤返盐的抑制效果大于秸秆表层覆盖和秸秆深层覆盖,并且,在不同的秸秆双层覆盖的处理中,T4处理的控盐保水效果最好,是一种较好的改良盐碱土的方法。
[Abstract]:In this paper, the improvement effect and mechanism of straw double layer mulching on saline-alkali soil were studied by means of indoor soil column simulation, in order to provide theoretical basis for saline-alkali soil improvement. The results showed that the effect of straw double layer mulching on saline-alkali soil was compared with that of control. Different straw mulching models could reduce the cumulative evaporation of soil water (the ratio of mulching straw to soil surface was 2: 1 at 35 ~ 40 cm below the soil surface) and the cumulative evaporation of soil water in 45 days was lower than that of CK (control without straw mulching). 36.73 mm, and the inhibition rate was 65.89 mm. The inhibition of soil moisture evaporation was the best. 2) Straw treatment inhibited soil salt return to different extent, among which T4 treatment had the lowest salt return rate, and T4 treatment had the best inhibition effect on soil moisture evaporation. The effect of straw double layer mulching on soil moisture evaporation and soil salt recovery was much higher than that of straw surface mulch and straw deep mulch, and the effect of straw double layer mulching on soil moisture evaporation and soil salt return was much higher than that of straw surface mulch and straw deep mulch, and there was a significant positive correlation between soil moisture accumulation and soil salt content. Among the treatments with double mulch of straw, T4 treatment has the best effect of controlling salt and keeping water, and it is a better method to improve saline-alkali soil.
【作者单位】：山东农业大学资源与环境学院;
【基金】：山东省重点产业关键技术项目(2016CYJS05A02) 国家自然科学基金项目(31570522)共同资助~~
【分类号】：S156.4

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