摘要
研究盆栽条件下 ,低水量滴灌入渗及蒸发过程土壤水盐运移规律。结果表明 ,入渗过程中 ,当灌水速度为 0 .5L·h-1,灌水量为 0 .5、1.0、1.5L时 ,土壤表面湿润半径分别为 13、15、16cm ,湿润深度分别为 15、17、2 0cm。在灌水中心附近 ,土壤水分分布较边缘集中 ;盐分随水向四周扩散 ,最后积聚在干、湿土体交界处。低灌水速度情况下 ,盐分最高积聚区离湿润锋 2cm左右。蒸发过程中 ,表土层 2cm范围内土壤水分变化较剧烈 ,土壤水分逐渐集中在湿润土体中心 ;盐分表聚性逐渐减弱 ,土体边缘盐分变化量较土体中心大 ;蒸发前后 ,蒸发水量 6 6 8g ,表层 2cm范围盐分增加 7.17g。
The experiment the studied transport tion of soil water and salt under point drip irrigation. When the drip irrigation speed was 0.5 L·h -1 the irrigation was 0.5, 1.0 and 1.5 L. The wetted radius on soil surface was 13, 15, 16 cm and the wetted depth was 15, 17, 20 cm. Water content near the center of irrigation was higher than the edge. Salt diffused along with water in all directions and accumulated in the common border of dry soil and wet soil during infiltration. There are 2 cm from the area of the highest salt content to wetting front at a low speed of drip irrigation. In the process of evaporation, the moisture within 2 cm of topsoil layer changed much higher than the other areas and accumulated in the center of wetted soil. The character of salt surface accumulation got weaker and the salt content variation at the edge of soil was higher than that in the center of the wetted soil. The water decreased by 668 g and the salt increased by 7.17 g within 2 cm of top layer during evaporation
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2002年第1期24-28,共5页
Journal of Hebei Agricultural University
基金
石家庄农业现代化研究所所长基金资助项目
关键词
土壤水盐运移试验
点源入渗
蒸发
微咸水
滴灌
point source infiltration
evaporation
soil water movement and salt transport ation
