覆膜方式对沟灌水分入渗影响

通过室内沟灌不同覆膜方式水分入渗试验，分析了相同水平湿润距离下覆膜方式对水分运移分布影响，结果表明：(1)相同入渗时间下不同覆膜方式的累积入渗量大小顺序为不覆膜、沟坡覆膜、沟底覆膜、沟底覆膜+1/2上部沟坡覆膜；(2)入渗初期，相同水平湿润距离下，垂直湿润锋运移距离大小顺序与累积入渗量大小顺序相同；(3)入渗结束时，不同覆膜方式的土壤含水量等值线近似半圆形，不覆膜和沟坡覆膜的土壤含水量等值线分布明显比其他覆膜方式密集，土壤含水量则明显变小。总之，本研究可以为确定合理沟灌方式提供理论依据。

Impact from film mulching mode on water infiltration under furrow irrigation

Through an indoor experiment on water infiltration under furrow irrigation with various film mulching modes，the impact from the film mulching mode on the water transport and distribution under the condition of the wetting front at the same level is analyzed herein. The result shows that：(1)the sequential order of the cumulative infiltration with different mulching modes under the condition of the same infiltration time is to be：without mulching> mulching of furrow slope> mulching of furrow bottom> mulching of furrow bottom plus half of the upper slop; (2)during the initial infiltration，sequential order of the transport rate of the vertical wetting front is the same with that of the cumulative infiltration; (3)after the infiltration，the contour lines of the soil water contents for various mulching modes are approximately semi-circled，moreover，the distributions of the contour lines of the soil water contents for both the mode of without mulching and the mode of mulching of furrow slope are obviously dense than those for the other modes with distinct decrease of the soil water content. On the whole，this study can lay a theoretical basis for the determination of the reasonable mode of furrow irrigation.