秸秆深施还田历经时间对蓄水效果的影响

Effect of time on soil water storage capacity after straw deep application

在实验室人工控制降水条件下,对黑龙江省黑土耕地土壤深施3种不同作物秸秆,研究其蓄水效果及土壤含水量随历经时间的变化规律。结果表明,秸秆深施初期在各深度土层上大豆和玉米秸秆的蓄水效果显著(P<0.05)。秸秆深施9个月在距离秸秆深施较近15和20 cm土层处玉米、水稻和大豆秸秆有显著效果。秸秆深施22个月仅玉米秸秆在20 cm土层处有效果。随着深施秸秆历经时间的延长各种秸秆蓄水效果整体呈下降趋势。在水平方向上,随着距秸秆深施处距离的增加,土壤含水量逐渐减小。

Based on the artificial rain experiment in laboratory conditions. Whit three different kind of straw deep application in the soil, study on the effect of accumulating moisture and its variation law as time goes by. The results showed that when two weeks in each depths of soil soybean and com straw effect on soil water storage to improve significantly（P〈0.05）. After 9 months of deep application, corn rice and soybean group had a significant effect at 15 cm and 20 cm depth in the soil. After 22 months of deep application, only corn group had a significant effect at 20 cm depth in the soil. As the time of deep application goes by storage effect of all kinds of straw decreased. In the horizontal direction, with the increase of the distance from the center of deep application, The increase of soil moisture content decreased gradually.