渗水地膜全覆盖对高含盐土壤水盐运移的影响

为了提高旱作农田降雨的利用效率,解决高含盐土壤水分入渗及盐分淋洗效果等问题,在晋北应县进行了渗水地膜全覆盖土壤积水入渗试验。结果表明:高含盐土壤经过覆盖渗水地膜处理后的入渗量小于不做处理的土壤,且其入渗速度比较稳定,有利于积水均匀地下渗;在全覆盖渗水地膜的情况下,盐分运移的平衡点在40 cm深土壤处。通过渗水地膜全覆盖可有效降低高含盐土壤在0～40 cm土层的含盐量,并能保证耕层土壤的盐分淋洗效果。

Effects of Water-Permeability Plastic Film Mulching Entire Cover to Water and Salt Migration Under High Initial Soil Salt Content

In order to improve the rainfall utilization efficiency in dry-land region and solve the problems of moisture infiltration and salinity elution effect in the high salinity soil,the water-permeability experiment of soil water percolation through mulching plastic film with permeability was carried out in Yingxian couty in north of Shanxi.The results indicate that: through the water-permeability plastic film mulching entire cover,the infiltration of the soil with high salinity is less than unhandled,and the infiltration rate is stable,which is good for water infiltration evenly;the balance point of salt movement is 40 cm deep in soil covered entirely by plastic film with permeability.The salinity in 0～40 deep in the soil will be decreased effectively through entirely covering the plastic film with permeability,and the method can guarantee the salinity elution effects in the plough layer also.