Percent change of growth forms and species that represented at least 0.5% relative cover across both sites, either in 2019 or 2021, within the center plot of T and TS treatments. The percent difference of absolute cover is presented first, followed by relative cover in parenthesis. Absolute and relative cover are calculated as follows: absolute percent differences = ([species cover in 2021 – species cover in 2019] / species cover in 2019), and relative percent differences = ([species cover in 2021/total species cover in 2021] – [species cover in 2019/total species cover in 2019]). Asterisks denote significant differences between 2019 and 2021. Means and standard deviations of each growth form can be found in Supplemental Materials, Table S10.
| Growth Form | Percent Difference Absolute (Relative) | Species | Percent Difference Absolute (Relative) |
|---|---|---|---|
| Bare Ground* | +83% (+4%) | Bare Soil | +86% (+3%) |
| Rocks/Stones | +110% (+1%) | ||
| Litter* | +321% (+13%) | Loose Organic Matter | +58% (+0.2%) |
| Plant Litter | +75% (+2%) | ||
| Woody Litter | +10464% (+11%) | ||
| Deciduous Shrubs | −1% (−2%) | Arctous rubra | −13% (−1%) |
| Salix arctica | −16% (−0.4%) | ||
| Salix reticulata | +25% (+0.2%) | ||
| Vaccinium uligonosum | −1% (−1%) | ||
| Evergreen Shrubs* | −31% (−8%) | Cassiope tetragona | −54% (−4 %) |
| Dryas integrifolia | −0.4% (−1%) | ||
| Empetrum nigrum | −12% (−0.3%) | ||
| Rhododendron lapponicum | −61% (−2%) | ||
| Rhododendron tomentosum | −43% (−1%) | ||
| Vaccinium vitis-idaea | −8% (−0.3%) | ||
| Forbs* | +83% (+2%) | Bistorta vivipara | +208% (+1%) |
| Cardamine digitata | +455% (+1%) | ||
| Hedysarum alpinum | +58 % (+0.2%) | ||
| Oxytropis arctica | −71% (−1%) | ||
| Oxytropis maydelliana | +263% (+0.5%) | ||
| Graminoids* | +63% (+2%) | Carex bigelowii | +133% (+1%) |
| Carex rupestris | +18% (+0.03%) | ||
| Lichens* | −30% (−12%) | Alectoria ochroleuca | −33% (−3%) |
| Cetraria nivalis | −38% (−4%) | ||
| Cetraria ericetorum | −34% (−0.2%) | ||
| Cladonia sp. | −75% (−0.5%) | ||
| Dactylina arctica | −26% (−0.4%) | ||
| Gowardia nigricans | −9% (−1%) | ||
| Thamnolia vermicularis | −43% (−3%) | ||
| Unidentified crustose lichen | −16% (−0.2%) | ||
| Mosses* | −19% (−2%) | Aulacomnium turgidum | +23% (+0.1%) |
| Hylocomium splendens | −66% (−1%) | ||
| Pohlia nutans | −22% (−1%) | ||
| Polytrichastum pallidisetum | −91% (−0.5%) | ||
| Bucklandiella microcarpa | +35% (+0.1%) | ||
| Rhytidium rugosum | −31% (−0.4%) | ||
| Sanionia uncinata | −10% (−0.1%) |