棉秆隔层对土壤水分入渗及水盐分布的影响

Effect of Cotton Straw Interlayer on Soil Infiltration Characteristics and Distribution of Soil Water and Salt

采用室内土柱试验,研究了裸地、棉秆隔层表层放置及棉秆隔层15、30、45、60cm处放置6个处理的土壤入渗特征及入渗后土壤水盐分布。结果表明,棉秆隔层的设置降低了土壤入渗速率和累积入渗量,有利于棉秆隔层以上盐分的淋洗;秸秆隔层的设置降低了土壤水分的蒸发,有利于隔层以下土壤水分的保持;各处理盐分均出现表聚,其中秸秆表层覆盖盐分表聚最小。研究结果可以为盐碱地改良提供依据。

The indoor soil column infiltration experiments were carried out to study the effects of cotton straw interlayer on soil water infiltration and the distribution of soil water and salt.Six treatments were set in the experiment,including bare soil surface without cotton straw,soil surface with cotton straw,and different depths below soil surface(15 cm,30 cm,45 cm and 60 cm).The results showed that cotton straw interlayer reduced soil infiltration rate and cumulative infiltration,which was benefit for soil salt leaching above the cotton straw interlayer.The cotton straw interlayer reduced the evaporation of soil moisture,which was benefit for maintain soil moisture below interlayer.Surface aggregetion of salt occurred in all treatments,the surface concentrdtion of soil salt was minimal in treatment of soil surface covered with cotton straw.