毛乌素沙地土壤的持水特性研究

Study on Water-retention Characters of Maowusu Sandy Soil

研究了位于毛乌素沙地南缘的盐池沙地土壤的持水特性,采用张力计和压力膜法测定了土壤的水分特征曲线,并用y=ax-b(y为土壤容积含水量,x为土壤吸力)模型进行了拟合,效果较好。进一步研究了土壤的供水性和各类有效水含量。结果表明,持水性、供水性和有效水含量由表层到下层是逐渐降低的。

The water-retention characters of Maowusu sandy soil were studied in Yanchi County,Ningxia Hui Autonomous Region.The soil water characteristic curves were measured with tensometers and pressure vessel and simulated with the model y=ax^(-b)(y denote water content,x denote soil suction).The water supply character and available water of soil were studied and found to be higher in surface layers than in underlayers.