不同覆盖模式下土壤返盐及水盐运移规律
发布时间：2018-10-14 09:40
【摘要】：干旱地区地表蒸发引起土壤水分的散失是造成盐分表聚的重要原因之一,土壤表层进行覆盖处理可改变地表结构,从而影响土壤水分蒸发和盐分迁移过程,本研究旨在通过野外田间试验,研究不同覆盖模式下土壤返盐及水盐运移规律。结果表明:土壤表层进行不同覆盖处理均可有效抑制土壤水分蒸发,土壤保水效果为:覆砂+覆膜覆秸秆+覆砂覆砂覆秸秆+覆膜无覆盖(CK);随土层深度的增加,土壤含水率减小的趋势逐渐减缓。不同覆盖处理也可有效抑制土壤盐分表聚,缩小盐分在土壤中迁移的范围;覆盖处理的土壤盐分向上迁移主要发生在0~20 cm范围内,无覆盖处理在0~35 cm范围内,覆盖后可较好地抑制土壤返盐。综合考虑认为砂石覆盖模式是较适合该试验区的覆盖模式。
[Abstract]:The loss of soil moisture caused by surface evaporation in arid areas is one of the important reasons for salt accumulation. The surface structure can be changed by covering the soil surface, thus affecting the process of soil moisture evaporation and salt migration. The purpose of this study was to study the movement of soil salt and water salt under different mulching models through field experiments. The results showed that the soil moisture evaporation could be effectively inhibited by different mulching treatments on the soil surface. The soil water retention effect was as follows: (CK); without mulching with sand mulch and straw mulching without mulching with the increase of soil depth; The decreasing trend of soil moisture content gradually slowed down. Different mulching treatments could also effectively inhibit the accumulation of soil salt and reduce the range of salt migration in the soil, and the upward migration of soil salt in mulching treatment mainly occurred in the range of 0 ~ 20 cm, while that of no mulching treatment was in the range of 0 ~ 35 cm. After mulching, soil salinization was inhibited. It is considered that the sand and stone covering model is more suitable for the test area.
【作者单位】： 兰州理工大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51269008) 兰州理工大学红柳青年教师培养计划资助项目(Q201310)
【分类号】：S156.41
本文编号：2270080
[Abstract]:The loss of soil moisture caused by surface evaporation in arid areas is one of the important reasons for salt accumulation. The surface structure can be changed by covering the soil surface, thus affecting the process of soil moisture evaporation and salt migration. The purpose of this study was to study the movement of soil salt and water salt under different mulching models through field experiments. The results showed that the soil moisture evaporation could be effectively inhibited by different mulching treatments on the soil surface. The soil water retention effect was as follows: (CK); without mulching with sand mulch and straw mulching without mulching with the increase of soil depth; The decreasing trend of soil moisture content gradually slowed down. Different mulching treatments could also effectively inhibit the accumulation of soil salt and reduce the range of salt migration in the soil, and the upward migration of soil salt in mulching treatment mainly occurred in the range of 0 ~ 20 cm, while that of no mulching treatment was in the range of 0 ~ 35 cm. After mulching, soil salinization was inhibited. It is considered that the sand and stone covering model is more suitable for the test area.
【作者单位】： 兰州理工大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51269008) 兰州理工大学红柳青年教师培养计划资助项目(Q201310)
【分类号】：S156.41
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