运用倒置“W”9点取样法 ,对菏泽地区棉田杂草调查结果表明 ,该地区棉田杂草有 1 2科 2 6种 ,其中禾本科杂草占 30 .8% ,阔叶杂草占 61 .5% ,莎草科占 7.7%。相对多度 1 0以上的杂草依次有马齿苋、牛筋草、马唐、铁苋菜、碎米莎草、反枝苋、香附子等 7种 ,其中 ,马齿苋、牛筋草、马唐、铁苋菜 4种杂草的相对多度分别为 55.1 2、51 .84、45.7、35.37,是当地棉田杂草的优势种 The survey results of weed in cotton field in Heze area using inverted “W” 9-point sampling method showed that weeds in this area had 12 species and 26 species, of which weeds accounted for 30.8% and broad-leaved weeds accounted for 61% .5%, Cyperaceae accounted for 7.7%. The relative abundance of over 10 weeds followed by purslane, tendon grass, crabgrass, iron amaranth, broken beech, Amaranthus retroflexus, Cyperus rotundus and other seven, of which purslane, tendon grass, The relative abundance of four weeds, Crabgrass, Iron Amaranth, were 55.1 2, 51.84, 45.7, 35.37, respectively, which were the dominant species of weeds in local cotton fields