滴(渗)灌土壤水分移动规律研究初报

对地埋式滴（渗）灌和地表式滴（渗）灌水分移动规律的研究表明，滴（渗）灌水分在土壤中的移动分为两个阶段，第一阶段为水分等速移动阶段，水峰呈现圆形扩散；第二阶段为水分不等速移动阶段，呈现立卵形移动，水分下移速度最快，上移速度最慢，前者为后者的2．2～2．55倍。在本试验条件下，地表式滴（渗）灌的土壤水分蒸发量较地埋式大33％～39．7％，如果滴（渗）灌与地膜覆盖相结合，可减少土壤水分蒸发量的76％～86．8％，能进一步提高水分利用率。

The Movement Rule of Soil Moisture under Drop Irrigation

The study showed that the movement of soil moisture under drop irrigation was devided into two periods, the first, equal speed movement and the second, unequal speed movement.If drop irrigation was combined with plastic film mulch,the evaporation of soil mosture could be reduced and the water using efficiency increased.