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为明确重庆市烟田杂草的种类、分布和危害情况,采用倒置W九点取样法对重庆市烟田杂草进行了调查.结果表明:重庆市烟田杂草共有121种,隶属于35科,其中阔叶杂草93种,占76.86%;禾本科杂草19种,占15.70%;其他杂草9种,占7.44%.一年生杂草68种,占56.20%;多年生杂草53种,占43.80%.根据各杂草相对高度、相对盖度、相对多度的综合值进行评价,藜、紫苏、尼泊尔蓼、马唐、牛膝菊、艾蒿、狗尾草和黄花蒿是重庆市烟田的优势杂草.地区间杂草发生危害情况差异显著,尼泊尔蓼、牛膝菊和雀稗在渝东北植烟区发生危害较为严重,艾蒿、马唐、狗尾草、西来稗、紫苏和藜次之;渝中部植烟区以藜发生危害较为严重,马唐、尼泊尔蓼、牛膝菊、黄花蒿、铁苋菜和春蓼次之;渝东南植烟区以藜、紫苏、黄花蒿和狗尾草的危害占优势.
In order to clarify the species, distribution and harmfulness of weeds in tobacco fields in Chongqing, we investigated the weeds in tobacco fields in Chongqing by inverted W nine-point sampling method.The results showed that there were 121 weeds in tobacco fields in Chongqing, belonging to 35 Of which 93 are broad-leaved weeds, accounting for 76.86%, 19 species of weeds are grass-dominated, accounting for 15.70%, 9 are other weeds, accounting for 7.44%, 68 are annual weeds, accounting for 56.20%, and 53 are perennial weeds , Accounting for 43.80% .According to the relative height, relative coverage and relative abundance of each weed, we evaluated the comprehensive value of Chenopodium album, Perilla frutescens, Polygonum cibunii, Artemisia annua, Artemisia annua, Setaria viridis and Artemisia annua The dominant weeds in tobacco fields were significant differences in the occurrence of weeds in the area. Polygonum Niger, Abies alfredii and Paspalum perenne were more harmful in tobacco planting areas in northeast Chongqing, and Artemisia, Crabgrass, Setaria viridis, Su You and Chenopodium followed by; Yuzhong tobacco planting area to more serious harm to Chenopodiaceae, Crabgrass, Nepal Polygonatum, Artemisia annua, Artemisia annua, Amaranthus and Polygonum second; tobacco planting areas in Southeast Tobacco with Chenopodium album, perilla, Artemisia annua And Fox harm the dominant.