Table 1.
Predictor variables used in linear mixed models on plant diversity. Covariates were selected based on an earlier study examining numerous environmental factors to explain the Swiss vascular plant diversity at the landscape scale [32].
| description | unit | mean±s.d. | min. | max. |
|---|---|---|---|---|
| atmospheric N deposition | kg ha−1 yr−1 | 17.5±8.3 | 2 | 44 |
| elevation | m.a.s.l. | 1243±715 | 263 | 3175 |
| lowland agricultural area | ha | 25.5±29.8 | 0 | 97 |
| open woody formation area | ha | 6.5±8.9 | 0 | 65 |
| calcareous substrate | % | 82.1±32.6 | 0 | 100 |
| range of temperature variation Jul.–Jan. | °C | 5.4±3.9 | 0.2 | 18.3 |
| standard deviation of creek lengths per plot | m | 30.9±18.6 | 0 | 76 |