Table 7.
Data dictionary for plant functional traits (dataset iii-b) from an ITEX experiment in Endalen and two elevational gradients with and without nutrient input from a seabird colony, in Bjørndalen and on Lindholmhøgda, respectively, near Longyearbyen, Svalbard.
| Variable name | Description | Variable type | Variable range or levels | Units | How measured |
|---|---|---|---|---|---|
| Project | Project from where data were collected; ITEX = ITEX warming experiment, Gradient = elevational gradients | categorical | Bryophytes – Gradient | recorded | |
| Year | Year of sampling | numeric | 2018 – 2018 | yyyy | recorded |
| Date | Date of sampling | date | 2018-07-17 – 2018-07-24 | yyyy-mm-dd | recorded |
| Gradient | Elevational gradient; C = reference, B = nutrient input gradient (seabird colony) | categorical | B - C | defined | |
| Site | Site as a number 1–7 | categorical | 1–7 | defined | |
| PlotID | Plot ID from A to G | categorical | A–G | defined | |
| Individual_nr | Individual number | numeric | 1–5 | defined | |
| ID | Unique leaf ID consisting of 3 letters and 4 numbers | categorical | AAZ7235 - CWR4667 | defined | |
| Taxon | Species name including genus and species | categorical | alopecurus ovatus - trisetum spicatum | identified | |
| Trait | Plant functional leaf trait including plant height, wet/dry mass, leaf area, leaf thickness, shoot length, shoot ratio, specific leaf area, leaf dry matter content, water holding capacity, specific root length, carbon, nitrogen and phosphorus content, CN and NP ratio, d13C and d15N isotope ratio | categorical | C_percent - WHC_g_g | defined | |
| Value | Leaf trait value | numeric | −32.999 - 419 | cm, g, cm2, mm, cm2/g, percentage, permil | recorded |
| Elevation_m | Elevation of site | numeric | 9.759 - 238.159 | m a.s.l. | recorded |
| Latitude_N | Latitude of site | numeric | 78.207 - 78.239 | Degree north | recorded |
| Longitude_E | Longitude of site | numeric | 15.34 - 15.712 | Degree east | recorded |
| Functional_group | Plant functional group; vascular and bryophyte | categorical | bryophyte - vascular | identified |
The dataset contains 11,345 observations of the covers of 41 taxa in 63 vegetation plots sampled across six sites, three fire histories, and three years. Variable names, description variable type, range or levels, units and short description is given for all variables.