To understand the effects of different mulching on the weed community in winter wheat field in Guanzhong region of Shaanxi province,an investigation was conducted on the weed species,weed density,important value of weed and species diversity of weed community in a 3-year experimental field.The results of permANOVA(permutational multivariate analysis)showed significant differences between jointing and ripening stage,flatten and ridge culture,black and transparent plastic film,and 9mulching treatments.Differe...