新疆棉田地下滴灌方式下土壤水分运移变化规律研究

为探讨新疆棉田地下滴灌方式下土壤水分含量的规律,在棉花不同生育期,采用烘干法,从水平方向和垂直方向上测定棉田土壤水分含量.结果表明,棉花不同生育期垂直方向上土壤含水量的变化随着土层深度的增加均呈增大的趋势;水平方向上土壤含水量的变化,除在35～55 cm土层有波动外,其余各土层基本无变化;不同土层平均土壤含水量随棉花生育进程基本呈二次曲线变化,不同土层平均土壤含水量的变化基本呈"S形变化.

Study on Change Rule of Soil Moisture Movement under Subsurface Drip Irrigation in Cotton Field of Xinjiang Autonomous Region

In order to discuss the change rule of transportation and movement of soil moisture under subsurface drip irrigation of cotton field in Xinjiang autonomous region,the authors adopted drying method to measure the soil water content in horizontal direction and vertical direction in different breeding time of cotton.The result indicated that the soil water content increased with the increase of soil layer depth in the vertical direction,while it kept changeless in horizontal direction except for the fluctuation in the depth of 35cm to55cm.The change of average soil water content assumed quadratic curve in different breeding time of the cotton,while the change of average soil water content in different soil layer depth assumed S shape.