title: Sampling and Complementarity Effects of Plant Diversity on Resource Use Increases the Invasion Resistance of Communities.
abstract: BACKGROUND
  Although plant diversity is postulated to resist invasion, studies have not provided consistent results, most of which were ascribed to the influences of other covariate environmental factors.
  
  
  RESULTS
  To explore the mechanisms by which plant diversity influences community invasibility, an experiment was conducted involving grassland sites varying in their species richness (one, two, four, eight, and sixteen species). Light interception efficiency and soil resources (total N, total P, and water content) were measured. The number of species, biomass, and the number of seedlings of the invading species decreased significantly with species richness. The presence of Patrinia scabiosaefolia Fisch. ex Trev. and Mosla dianthera (Buch.-Ham. ex Roxburgh) Maxim. significantly increased the resistance of the communities to invasion. A structural equation model showed that the richness of planted species had no direct and significant effect on invasion. Light interception efficiency had a negative effect on the invasion whereas soil water content had a positive effect. In monocultures, Antenoron filiforme (Thunb.) Rob. et Vaut. showed the highest light interception efficiency and P. scabiosaefolia recorded the lowest soil water content. With increased planted-species richness, a greater percentage of pots showed light use efficiency higher than that of A. filiforme and a lower soil water content than that in P. scabiosaefolia.
  
  
  CONCLUSIONS
  The results of this study suggest that plant diversity confers resistance to invasion, which is mainly ascribed to the sampling effect of particular species and the complementarity effect among species on resources use.
authors.affiliation: Department Life Science, Taizhou University, Taizhou, Zhejiang, China.
authors.forename: Dan H
authors.initials: DH
authors.lastname: Zhu
authors.affiliation: Department Life Science, Taizhou University, Taizhou, Zhejiang, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.affiliation: Department Life Science, Taizhou University, Taizhou, Zhejiang, China.
authors.forename: Wei Z
authors.initials: WZ
authors.lastname: Zhang
authors.affiliation: Department Life Science, Taizhou University, Taizhou, Zhejiang, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Department Life Science, Taizhou University, Taizhou, Zhejiang, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.affiliation: Department Life Science, Taizhou University, Taizhou, Zhejiang, China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Wang
mesh_terms: D044822:Biodiversity; D018533:Biomass; D002681:China; D065948:Grassland; D058865:Introduced Species; D008027:Light; D009584:Nitrogen / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism; D063148:Plant Dispersal; D010944:Plants / Q000378:metabolism / Q000528:radiation effects; D036226:Seedlings; D012641:Selection, Genetic; D012987:Soil; D013045:Species Specificity; D014867:Water
chemical_list: D012987:Soil; D014867:Water; D010758:Phosphorus; D009584:Nitrogen