Mean annual litter biomass in response to nitrogen addition.

<p>Mean (Mg ha^-1 yr^-1) biomass of 8 litter categories (moss tissue, <i>V</i>. <i>myrtillus</i> leaf, reproductive organ, tree twig, tree branch litter, <i>P</i>. <i>abies</i> needle, <i>P</i>. <i>sylvestris</i> needle and deciduous tree leaf litter) in response to long-term N addition (0, 12.5 or 50 kg N ha-1 yr-1; n = 5). The total bar height represents the total (+SE) litter biomass (Mg ha^-1 yr^-1). Different letters (a or b) across bar segments with the same shade indicate significant differences pair-wise difference using Student-Newman-Keuls <i>post-hoc</i> tests.</p

Litter element and carbon chemistry fluxes.

<p>Total mean (+SE) litter carbon (a), nitrogen (b), phosphorus (c), lignin (d), cellulose (e) or hemi-cellulose (f) fluxes in response to long-term N addition (0, 12.5 or 50 kg N ha^-1 yr^-1; n = 5) for each litter category: moss, <i>V</i>. <i>myrtillus</i> leaves (V. m.), reproductive organs (Rep. org.), deciduous tree leaves (Dec. L.), <i>P</i>. <i>abies</i> needles (Spruce), <i>P</i>. <i>sylvestris</i> (Pine), twigs and branches. V. m and Dec. L. litter categories are missing from panels (d), (e) and (f) because insufficient litter material was available for these analyses. Different letters (a or b) next to each group of bars indicate significant differences between treatments (α = 0.05) determined using Student-Newman-Keuls <i>post-hoc</i> tests. Nearly significant difference at (0.05 < P < 0.10) are indicated by a star (*). Non-significant differences are indicated by n.s.</p

Appendix A. An analysis of variance (ANOVA) table showing the F and P values of a functional-group removal experiment.

An analysis of variance (ANOVA) table showing the F and P values of a functional-group removal experiment

Appendix C. Results of ANOVA testing for fertilizer and Empetrum effects on the remainder of the plant community.

Results of ANOVA testing for fertilizer and Empetrum effects on the remainder of the plant community

Total litter fluxes.

<p>Total litter fluxes.</p

Appendix A. Results of ANOVA testing for fertilizer and removal effects on plant community variables.

Results of ANOVA testing for fertilizer and removal effects on plant community variables

Appendix C. A figure showing the effect of tree root removal on dissolved inorganic nitrogen to dissolved organic nitrogen ratios in small, medium, and large island size classes.

A figure showing the effect of tree root removal on dissolved inorganic nitrogen to dissolved organic nitrogen ratios in small, medium, and large island size classes

Appendix F. Effects of fertilizer treatments on soil chemical properties.

Effects of fertilizer treatments on soil chemical properties

Summary of a two-way Analysis of Variance (<i>F</i> and <i>P</i> values) testing the effect of island size class, year, and their interactive effects on different community-weighted biomass allocation response variables.

<p>RA, LMF and SMF are the proportion of total shoot biomass produced in the growing season allocated to fruits, leaves and stems, respectively, and shoot turnover is the proportion of total shoot biomass produced in the growing season. Figures in bold indicate statistical significant at <i>P</i> < 0.05.</p

Results from multiple stepwise regression testing relationships between species biomass allocation responses and environmental variables for 2012.

<p>For each response variable the most parsimonious model is presented based on Akaike Information Criteria (AIC). Values of <i>t</i> are shown for each selected response variable, along with adjusted <i>R</i>² and <i>P</i> values for the regression models. For each of the response variables, the presented models contain only those variables for which <i>t</i>-values are shown.</p