The development of spatial pattern in shoots ofLinaria vulgaris(Scrophulariaceae) growing on fallow land or in a barley crop

摘要

Linaria vulgarisroot pieces 10ensp;cm long with 10ensp;cm tall shoots were planted with a barley crop and on fallow land in 1988 and 1989. Positions of new shoots ofL.vulgariswere recorded once a week throughout both summers. Densities ofL.vulgarisstands growing on fallow land were similar in both 1988 and 1989, ranging from 167ensp;shoots∙mminus;2in August to 247ensp;shoots∙mminus;2in October. Densities ofL.vulgarisstands growing with a barley crop varied between years, ranging between 1587 and 539ensp;shoots∙mminus;2from August to October in 1988 and being relatively stable at 95 shoots∙mminus;2between August and October in 1989. Stand diameter was consistently greater when on fallow land than in barley, with a maximum diameter of 1ensp;m in 1988 and 2ensp;m in 1989 when on fallow land, and a maximum diameter of 40ensp;cm in 1988 and 1ensp;m in 1989 in barley. In both years, new shoots produced in a week emerged in primary clumps 5ndash;10ensp;cm in diameter, and these were aggregated into secondary clumps that grew larger with time. Primary clumps on fallow land were produced in rings around initial stands, whereas when growing with barley they were scattered around and within initialL.vulgarisstands.Key words: spatial pattern, pattern of shoot growth,Linaria vulgaris, t