秸秆层施深度对土壤水分入渗 特性的影响

通过室内试验分析了秸秆层施深度对土壤水分入渗特性的影响，结果表明：（1）不同秸秆层施深度的累积入渗量和湿润锋运移距离均小于对照处理，入渗时间越长，减渗效果越明显，随着秸秆层施深度的减小，相同入渗时间的累积入渗量和湿润锋运移距离减小；（2）不同秸秆层施深度下，秸秆层上部土壤含水量比不施秸秆时大，而秸秆层下部土壤含水量比不施秸秆时小；（3）入渗结束时，层施深度越小，其秸秆层上部的土壤含水量越大，而秸秆层下部范围则相反。研究结果可以为秸秆覆盖下农田水分的高效利用提供参考。

Impact from layer-applied straw depth on soil water infiltration characteristics

The impact from the layer-applied straw depth on the soil water infiltration characteristics is analyzed through the lab-experiment concerned.The result shows that:(1)both the amounts of the accumulated infiltrations and the distances of the wetting peak fronts of different layer-applied straw depths are less than those from the controlled processing; i.e.the longer the infiltration time is， the obvious the infiltration reduction effect will be， while the accumulated infiltration amounts and the wetting front movement distance are reduced with the decrease of the depth of the layer-applied straw; (2)under the different layer-applied straw depths， the water content in the soil upon the layer-applied straw is larger than that in the soil without the layer-applied straw， while the water content in the soil under the layer-applied straw is less than that in the soil without the layer-applied straw; (3)at the end of infiltration， the less the layer-applied depth is， the larger the water content in the soil upon the straw layer will be， whereas it is reversed under the straw layer.This study result can provide a reference for the high efficient utilization of water resources for the straw mulching farmland.