title: [Species, Damage and Community Structure of Weeds in Scrophularia ningpoensis Fields in Nanchuan, Chongqing].
abstract: OBJECTIVE
  To investigate the damage and community structure of weeds in Scrophularia ningpoensis fields in Nanchuan, Chongqing.
  
  
  METHODS
  From 2013 to 2014, an investigation was carried out by inverted W-9 point sampling method to study the weed species.
  
  
  RESULTS
  96 weed species belonged to 75 genera of 30 families were observed, including 18 species of Asteraceae weeds (accounted for 18.75%), 10 species of Poaceae weeds (accounted for 10.42%). Moreover, there were 57 species of annual weeds (accounted for 59.38%) and 39 species of perennial weeds (accounted for 40.63%). The overall abundance of Erigeron annuus, Digitaria adscendens, Torilis scabra, Polygonum nepalense, Ranunculus japonicas, Stellaria media and Commelina communis were relatively higher than that of the others.
  
  
  CONCLUSIONS
  The difference of weed species and community structure might result from the physical and chemical characteristics of soil, moisture content, cropping system, tillage type, environmental and climatic conditions, crop distribution and weed control.
authors.forename: Feng
authors.initials: F
authors.lastname: Han
authors.forename: Jie-yi
authors.initials: JY
authors.lastname: Xiao
authors.forename: Hou-qiang
authors.initials: HQ
authors.lastname: Cao
authors.forename: Chuan
authors.initials: C
authors.lastname: Luo
authors.forename: Tian-jian
authors.initials: TJ
authors.lastname: Yang
authors.forename: Mao-xiang
authors.initials: MX
authors.lastname: Lin
mesh_terms: D000383:Agriculture; D019659:Asteraceae / Q000145:classification / Q000254:growth & development; D044822:Biodiversity; D002681:China; D057685:Plant Weeds / Q000145:classification* / Q000254:growth & development; D006109:Poaceae / Q000145:classification / Q000254:growth & development; D032266:Scrophularia; D012987:Soil
chemical_list: D012987:Soil