Appendix B. Amount of biomass removed.
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| FIG. B1. Average amount of biomass removed per plot (4 m2) from the RR (black bars), RR+N (dark gray bars), SR (white bars) and SR+N (hatched gray bars) removal treatments in 2001 (when removal occurred at peak biomass, but before any nitrogen (N) addition), 2002 (with weeding and N addition), and 2003 (with weeding and N addition). Also shown is the total cumulative amount removed over all three years. Treatment abbreviations are: RR = random forb removal, ambient N; RR+N = random forb removal, added N; SR = shallow-rooted forb removal, ambient N; SR+N = shallow-rooted forb removal, added N. Different letters at the top of each bar denote significant differences among treatments within each year at P < 0.05 using an ANOVA model with a block effect and the Tukey-Kramer HSD test to compare all pairs. Error bars are ±1 SE. |