辽宁省大豆田杂草发生与危害

Occurrence and damage of weeds in soybean fields in Liaoning Province

采用倒置"W"九点取样法调查辽宁省大豆田杂草,明确了辽宁省大豆田杂草有19科35种,其中阔叶杂草占74.29%,禾本科杂草占14.29%,其他杂草占25.71%;一年生杂草占54.29%,多年生杂草占31.43%。相对多度达10%以上的杂草依次为藜、鸭跖草、稗草、苘麻、反枝苋、红蓼、马唐、铁苋菜、马齿苋和山苦菜。其中藜和鸭跖草相对多度在30%以上,为辽宁省大豆田杂草优势种群。

An investigation of weeds in soybean fields was carried out in Liaoning by inverted W-9 point sampling The results showed that there were 35 weed species belonging to 19 families. Of all species recorded, broadleaved weeds accounted for 74. 29% , the grass family for 14. 29% and other families for 25. 71%. Annual weeds accounted for 54. 29% of the total and perennial weeds accounted for 31.43% . The weeds whose relative abundance （RA） 〉 10% were Chenopodiumalbum L. , Commelina commanis L. , Echinochloa crucially, Abutilon theophrasti Medic , Amaranthus retroflexus L. , Polygonum orientale L. , Digitaria sanguinalis L. Seep. , Acalypha australis L. , Portulaca pleracea L. and Ixeris chinchsis Thunb. Nakai.. The first two species were the most abundant weeds whose RA 〉 30%. Key words weed survey; relative abundance; inverted W-9 point sampling; injury level