Fig. 7.

Root sprouting vigour as a function of disturbance severity and frequency indicator values. Open circles are non-RS species and filled circles are RS species; the size of the circle is proportional to the log number of buds. Numbers at isoclines show the number of buds per 5 cm fragment length predicted by a generalized additive model with cubic smooth spline. Disturbance frequency is expressed as common log of disturbance return time in years (e.g. a value of –2 indicates disturbance once in a century), and disturbance severity as a proportion of bare soil opened in the disturbance event.