摘要
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 movement characteristics of redroot amaranth (amaranthus retroflexus),com-mon crabgrass(digitaria sanguinalis) , barnyardgrass(echinochloa crusgalli) in ploughed layer of corn field are studied. The results show that weed seeds are mainly distributed in 0-20cm ploughed layer of corn field and most weed seeds are in 0-5cm soil layer. However,weed seeds are distributed in 0-5cm surface layer,and a few weed seeds in 5cm soil layer down-wards founded. ploughing is one of driving force which made the weed seeds to move upwards and downwsrds in the ploughed layer. After ploughing,about 30 percent of the seed on soil surface is moved down to the bottom of the ploughed layer and about 10 percent of them on the bottom moved up to the surface.
出处
《生态农业研究》
CSCD
1999年第1期58-61,共4页
Chinese Journal of Eco-agriculture
关键词
稗草
马唐
苋菜
耕层
移动特性
玉米
Barnyardgrass, Crabgrass, Amaranth, Plaughed layer, Movement characteristic
