箭杆杨-乌拉尔甘草复合种植模式土壤水分特征研究

以“箭杆杨-乌拉尔甘草”复合种植模式为研究对象，通过烘干称重法测定2种带间距模式下不同月份水平及垂直方向土壤水分含量，研究其时间、空间变化特征。结果表明，垂直方向上，0~20 cm土壤含水量最低，随深度增加，含水量逐步上升，窄间距模式各层土壤含水量低于宽间距模式。水平方向上，离杨树行的距离越远，土壤含水量呈现出上升趋势，窄间距模式同样低于宽间距模式。不同月份宽、窄间距模式各测点垂直方向土壤水分随着深度的增加土壤含水量也逐渐升高。水平方向宽带和窄带都表现出在5月和8月含水量的波动性比较明显，而10月含水量变化比较稳定。

Soil Moisture Characteristics under Intercroping Pattern of Populus nigra var. thevestina-Glycyrrhiza uralensis

Soil water contents were measured in horizontal and vertical directions in different months in the soils intercropped with Populus nigra var. thevestina-Glycyrrhiza uralensis. In vertical direction, the soil water content of 0-20 cm layer was low. With the increase of the depth, soil water content gradually increased. The soil water content of each layer in narrow spacing cropped pattern was lower than the wide spacing pattern. In horizontal direction, the farther from poplar lines, the higher in soil water content, and narrow spacing patter was lower than wide spacing patter. In different months, vertical soil water content of each measuring point in wide and narrow spacing patterns gradually increased with the depth increased. In May and August, moisture content in horizontal direction changed significantly. However, it was relatively stable in October.