| Appendix A (Table A1). Bivariate correlations among predictors included in model of native species richness. LNR = log native richness, LEC = log of exotic cover, C/M = calcium to magnesium ratio, K = soil potassium, B = soil boron, OV = percent overstory canopy, OV2 = percent overstory squared (divided by 10,000), BUR = amount of burrowing, GR = grazed or not, LPPT = log regional annual precipitation, LELV = log regional elevation. Correlations shown in bold would be judged to be significantly different from zero under bivariate normal assumptions with P < 0.05. Sample size was 109. Standard deviations are given in the last line of the matrix. |
| LNR | LEC | C/M | K | B | OV | OV2 | BUR | GR | LPPT | LELV | |
| LNR | 1.0 |
||||||||||
| LEC | 0.211 |
1.0 |
|||||||||
| C/M | -0.175 |
0.157 |
1.0 |
||||||||
| K | 0.046 |
0.621 |
0.058 |
1.0 |
|||||||
B |
-0.149 |
0.534 |
0.069 |
0.550 |
1.0 |
||||||
| OV | -0.241 |
-0.474 |
0.153 |
-0.200 |
-0.039 |
1.0 |
|||||
| OV2 | -0.315 |
-0.347 |
0.198 |
-0.112 |
0.054 |
0.955 |
1.0 |
||||
| BUR | 0.221 |
0.332 |
0.010 |
0.002 |
0.137 |
-0.169 |
-0.133 |
1.0 |
|||
| GR | 0.104 |
0.593 |
0.130 |
0.310 |
0.287 |
-0.425 |
-0.353 |
0.381 |
1.0 |
||
| LPPT | 0.149 |
-0.614 |
-0.182 |
-0.543 |
-0.496 |
0.362 |
0.299 |
-0.242 |
-0.459 |
1.0 |
|
| LELV | 0.031 |
-0.681 |
0.045 |
-0.575 |
-0.486 |
0.280 |
0.136 |
-0.100 |
-0.351 |
0.533 |
1.0 |
| SD | 0.439 |
1.691 |
1.360 |
67.838 |
0.176 |
26.219 |
0.207 |
6.463 |
0.338 |
0.554 |
0.887 |
| units | log # spp/plot | log percent | ratio | mg/kg | mg/kg | % | % squared | % of area | yes or no | log mm | log m |