Table 1.
Descriptions, possible values or units of measure, and means or counts of landscape conditions, forest features, forest management activities, and disturbance factors evaluated as potential factors of site invasion by Japanese stiltgrass in forest plots in Tennessee
| Variable | Value or unit of measure | Mean (range) for continuous data/count for categorical data |
|---|---|---|
| Landscape conditions | ||
| Elevation | m | 213.04 (− 28.04 to 1809.9) |
| Slope | Degree | 10.88 (0.00 to 57.5) |
| Adjacency to water bodies | No | 2138 |
| Yes | 665 | |
| Forest features | ||
| Stand age | Years | 55.42 (2 to 137) |
| L1: 0 to 1.39 m3/ha/year | 0 | |
| L2: 1.40 to 3.39 | 256 | |
| L3: 3.50 to 5.94 | 1840 | |
| Site productivity | L4: 5.95 to 8.39 | 802 |
| L5: 8.40 to 11.54 | 290 | |
| L6: 11.55 to 15.74 | 78 | |
| L7: > 15.74 | 11 | |
| Tree species diversity (Hs) | Shannon’s species diversity | 1.88 (0 to 3.02) |
| Basal area | m2/ha | 22.53 (0.00 to 332.34) |
| Natural regenerationa | No | 3483 |
| Yes | 64 | |
| Forest management activities | ||
| Site preparationa | No | 3508 |
| Yes | 39 | |
| Artificial regenerationa | No | 3389 |
| Yes | 158 | |
| Cuttinga | No | 3270 |
| Yes | 277 | |
| Forestland ownership | Public | 486 |
| Private | 3061 | |
| Disturbance factors | ||
| D3: 92 to 152 m | 354 | |
| D4: 153 to 305 | 578 | |
| D5: 306 to 805 | 777 | |
| Distance to the nearest road | D6: 806 to 1609 | 333 |
| D7: 1610 to 4828 | 116 | |
| D8: 4829 to 8047 | 11 | |
| D9: > 8047 | 7 | |
| Fire disturbancea | No | 3511 |
| Yes | 36 | |
| Animal disturbancea | No | 3478 |
| Yes | 69 | |
| Disease disturbancea | No | 3537 |
| Yes | 10 | |
| Insect disturbancea | No | 3421 |
| Yes | 126 | |
| Human-caused disturbancea | No | 3482 |
| Yes | 65 | |
| Weather disturbancea | No | 3470 |
| Yes | 77 | |
aNormally within the past 5 years