保水剂对风沙土水分垂直入渗和含水量的影响

Effects of Super Absorbent Polymer on Vertical Water Infiltration and Moisture Content in Aeolian Sandy Soil

使用保水剂是有效利用和改良风沙土的重要途径。通过研究垂直人渗率、累积入渗量、渗吸持续时间、渗透系数4项入渗特征量以说明在5—7cm深度处层施保水剂对于风沙土水分垂直入渗的影响，测定人渗结束后土壤各层含水量以研究受试体系的水分垂直分布。结果表明，试验处理可使垂直人渗率在各时间点有不同程度减小。有3种保水剂处理累积入渗量均增加了42％左右（1％处理），渗吸持续时间增长了134％～390％，渗透系数减小了65％～85％，且4种变化趋势均随保水剂用量的增加而加剧。入渗结束后土壤水分垂直分布也发生明显变化：保水剂～土壤混合层含水量上升52％～178％，上层土壤含水量明显增加但下层土壤略微降低。研究表明，保水剂对风沙土水分垂直入渗和含水量影响十分明显。

Super absorbent polymer（SAP） can be used to exploit aeolian sandy soil and improve its quality ef fectively. The effects of blending SAP to a given depth（57 cm） in aeolian sandy soil on vertical infiltration were studied by measuring the four parameters of vertical infiltration rate, accumulated infiltration quantity, lasting time of suck permeability and permeability coefficient. After the infiltration experiment, soil moisture content in different layers was measured to determine the vertical moisture distribution. Results indicated that the vertical infiltration rates of SAPtreated soils were always less than that of untreated soil, accumula ted infiltration quantities were increased by about 42 %, lasting times of suck permeability were elongated by 134 %- 390% , and permeability coefficients were decreased by 65%- 85%in three different SAP treated soils. Increase in SAP concentration further accelerated the changes of the four parameters. There was also a conspicuous change in vertical moisture distribution, the moisture content of blendinglayer was increased by 52%-178%; and it was also increased in the upper soil layer, but decreased in the lower soil layer. The effects of SAP on the vertical infiltration and moisture content of aeolian sandy soil were very notable.