节水改造后盐渍化灌区区域地下水埋深与土壤水盐的关系

Relation Between Groundwater Depth and Soil Water and Salt After Water Saving Reform in salinization irrigation district

以内蒙古河套灌区临河研究区为例,探讨节水改造后盐渍化灌区区域土壤水盐与地下水埋深的内在联系。结果表明:地下水作用对灌区0-100cm深度土壤体积含水率都有影响,并且对60-100cm深度土壤含水率的影响尤为突出;随着地下水埋深水平的变化(浅→中→深),0-100cm各层土壤体积含水率总体逐渐降低;在地下水矿化度基本不变的情况下,根层土壤电导率与地下水埋深存在较好的指数关系;在0-20cm、20-40cm和40-60cm 3个土层中,土壤表层(0-20cm)盐分受地下水埋深的影响最大,土壤表层(0-20cm)土壤含盐量对地下水矿化度变化最敏感。

In order to investigate the inner connection between regional soil water and salt and groundwater buried depth in the irrigation district of salinization after water saving reform. Taking studied area in Linhe of Hetao irrigation district in Inner Mongolia as an example, the results showed that the effect of groundwater had an influence on the soil volumetric moisture content of 0--10 cm depth of irrigation area. In addition, the influence on the soil moisture content of 60--100 cm depth was particularly outstanding. As the change of groundwater depth（shallow→middle→deep）, the soil volumetric moisture content of 0--100 cm depth decreased gradually. In the condition of unchanged degree of mineralization of groundwater, electrical conductivity in the root layer soil had a good exponential relationship with groundwater depth. In the three soil layers of 0--20 cm, 20--40 cm, 40--60 cm, the groundwater depth had the greatest impact on soil surface（0--20 cm） salinity. Furthermore, soil salt content in soil surface（0--20 cm） had the most sensitive to the change of groundwater mineralization.