试验研究了玉米田稗草、马唐、苋菜杂草种子在玉米田耕层中的移动特性。结果表明,3种杂草种子在0～20cm玉米田耕层均有分布,0～5cm表层土壤分布最多;非耕地(对照)主要分布于0～5cm表层土壤,5cm土层以下分布极少。耕翻对杂草在耕层中的上下移动是双向的,1次耕翻可使约30％杂草种子从土壤表层移至耕层底部,同时也使约10％杂草种子从耕层底部移至土壤表层。 The moving characteristics of weed seeds of barnyardgrass, crabgrass and amaranth in corn field were experimentally studied. The results showed that the three kinds of weed seeds were distributed in the 0-20 cm corn layer, and the 0-5 cm layer was the most distributed. The non-cultivated area (control) was mainly distributed in the 0-5 cm surface soil layer, with very few distribution below 5 cm soil layer. Tillage The weeds are bi-directional up and down in the tillage, with 1 tillage allowing about 30% of the weed seeds to migrate from the soil surface to the bottom of the tillage and about 10% of weed seeds from the bottom of the tillage Move to soil surface.