黄河流域紫花苜蓿田间杂草的群落特征OA

Weeds can significantly reduce the yield and quality of Medicago sativa and have become one of the most important pest groups in M.sativa fields.The Yellow River Basin is the core production area of M.sativa in China,where it is of great significance to carry out weed prevention and control in M.sativa fields.To systematically clarify the weed communities characteristics in M.sativa fields in the Yellow River Basin,field weed surveys were conducted in M.sativa planting areas of Shandong,Henan,Shanxi,Shaanxi,Inner Mongolia,Ningxia and Gansu.The results showed that the weeds in M.sativa fields of the Yellow River Basin belonged to 27 species,25 genera and 12 families.Poaceae,Chenopodiaceae and Asteraceae were the dominant families.Gramineous weed species such as Setaria viridis were overwhelmingly dominant,while Chenopodium glaucum was the predominant broadleaf weed.Weed communities in M.sativa fields across the Yellow River Basin exhibited distinct geographical differences.Overall,the number of weed species in the middle and lower reaches was higher than that in the upper reaches.Specifically,Digitaria sanguinalis and Eleusine indica were the dominant species in the middle and lower reaches,including Shandong,Shanxi,and Henan provinces.S.viridis and other weed species were dominant in the middle reaches(Shaanxi and Inner Mongolia),while Echinochloa crusgalli and Cirsium japonicum were dominant in the upper reaches(Ningxia and Gansu).The priorities of weed control in M.sativa fields vary among regions.Broadleaf weeds should be the main target in Gansu.Gramineous weeds should be primarily controlled in Henan,Shanxi,Inner Mongolia,Shaanxi and Ningxia,while both gramineous and broadleaf weeds need to be managed in Shandong.This study clarified the weed community characteristics and occurrence dynamics in M.sativa fields of the Yellow River Basin,thereby providing a scientific basis for environmentally-friendly weed management in this region.