模块沙障对流动沙丘土壤水分动态的影响

Influence of Module Sand Barrier on Soil Moisture Dynamic in Moving Sand Dune

在流动沙丘设置具有＂肥岛＂功能的＂一字型＂模块沙障,并采用HOBO土壤水分记录仪定位定时测定土壤水分,研究不同外包装材料及不同内部填加物对流动沙丘土壤降水入渗及其水分动态变化的影响。结果表明：模块沙障影响降水向沙障覆盖下深层土壤入渗,模块沙障下40 cm土层含水量变化范围为5.23%-6.03%,对照处理为7.86%;黄麻袋外包装、内填20%玉米芯处理土壤含水量为7.61%,而其他处理为5.23%-5.99%;9.2 mm降雨后黄麻模块沙障内部水分含量由7.2%增加到8.96%,而纤维袋模块沙障覆盖下20 cm土层水分则由2.99%急剧增加到9.97%,以后均逐渐下降。

Through setting module sand barrier in moving sand dunes and measuring soil moisture with HOBO soil moisture recorder by positioning and timing, the influence of different outer packing materials and internal adding materials has been studied on rainfall infiltration of soil and the dynamic change of moisture. The results show that module sand barrier can prevent the precipitation from infiltrating into deep soil covered with sand barrier. The changing range of water content at 40 cm soil layer under module sand barrier is 5.23% - 6. 03%, with 7.86% for CK. The water content is 7.61% with jute as outer packing and 20% of corn cob as internal adding material, and 5.23% - 5.99% for other treatments. After 9.2 mm of rainfall, the water content inside of jute module sand barrier can rise from 7.2% to 8.96%, and the water content at 20 em soil layer covered with fiber bags module sand barrier can rise from 2. 99% to 9. 97% sharply, and then decrease gradually.