Total understory vegetation cover by soil nitrogen indicator category in 10 m × 10 m plots on the Clatse and Neekas rivers, B.C. Species are separated into nitrogen-rich soil and nitrogen-poor soil indicator categories based on data by Klinka et al. .
Mathewson et al. BMC Ecology 2003 3:4 doi:10.1186/1472-6785-3-4