Table 5 Results of logistic regression of the probability of high species mingling using tree size differentiation as the explanatory variable. \(k\) denotes the number of nearest neighbors used to calculate the mingling and size differentiation indices. High mingling was defined as \({M}_{i}^{(k)}\ge \frac{k-1}{k}\). \({\beta }_{1}\) and \({\beta }_{0}\) represent the slope and intercept parameters in the regressions. ***/**/* indicate \(p\) values < 0.001/ < 0.01/ < 0.05, respectively
Forest region | Plot | k = 4 | k = 6 | k = 8 | k = 10 | ||||
|---|---|---|---|---|---|---|---|---|---|
\({\beta }_{1}\) | \({\beta }_{0}\) | \({\beta }_{1}\) | \({\beta }_{0}\) | \({\beta }_{1}\) | \({\beta }_{0}\) | \({\beta }_{1}\) | \({\beta }_{0}\) | ||
Dms | a | 4.084*** | − 0.069 | 3.393*** | − 0.158 | 2.878*** | − 0.215 | 2.179*** | − 0.130 |
b | 5.482*** | − 0.599 | 4.212*** | − 0.466 | 3.781*** | − 0.560 | 3.020*** | − 0.454 | |
Dys | a | 3.766*** | − 1.075 | 3.512*** | − 1.226 | 3.194*** | − 1.259 | 3.004*** | − 1.328 |
b | 3.419*** | − 0.271 | 3.549*** | − 0.730 | 3.891*** | − 1.133 | 4.051*** | − 1.404 | |
c | 3.377*** | 0.321 | 3.207*** | − 0.046 | 2.727*** | − 0.115 | 2.856*** | − 0.427 | |
d | 3.200*** | 0.283 | 3.284*** | − 0.281 | 3.388*** | − 0.673 | 3.121*** | − 0.854 | |
Hp | a | 4.005*** | − 0.774 | 4.100*** | − 1.154 | 3.903*** | − 1.283 | 3.697*** | − 1.364 |
b | 3.523*** | − 1.051 | 3.465*** | − 1.306 | 3.260*** | − 1.388 | 3.299*** | − 1.579 | |
c | 2.460*** | 0.107 | 2.343*** | − 0.170 | 2.224*** | − 0.362 | 2.238*** | − 0.561 | |
d | 2.351*** | − 0.010 | 1.992*** | − 0.169 | 2.120*** | − 0.460 | 2.083*** | − 0.634 | |
Jws | a | 2.825*** | − 0.361 | 3.161*** | − 0.863 | 2.997*** | − 1.005 | 2.827*** | − 1.097 |
b | 3.549*** | − 0.653 | 3.090*** | − 0.778 | 2.756*** | − 0.866 | 2.509*** | − 0.950 | |
c | 3.577*** | − 0.844 | 3.187*** | − 0.948 | 2.666*** | − 0.935 | 2.336*** | − 0.951 | |
Ml | a | 4.029*** | − 1.468 | 3.685*** | − 1.564 | 3.474*** | − 1.642 | 3.294*** | − 1.692 |
b | 3.971*** | − 1.149 | 3.650*** | − 1.291 | 3.710*** | − 1.493 | 3.695*** | − 1.636 | |
c | 2.693*** | − 0.530 | 2.587*** | − 0.772 | 2.556*** | − 0.942 | 2.446*** | − 1.058 | |
Sws | a | 3.796*** | − 0.140 | 3.983*** | − 0.561 | 4.148*** | − 0.884 | 4.501*** | − 1.208 |
b | 4.179*** | − 0.802 | 3.952*** | − 1.173 | 3.901*** | − 1.434 | 4.079*** | − 1.703 | |
c | 2.181*** | 1.051 | 2.363*** | 0.458 | 2.735*** | − 0.027 | 2.724*** | − 0.273 | |
d | 3.182*** | 0.170 | 2.741*** | − 0.115 | 2.618*** | − 0.352 | 2.546*** | − 0.557 | |
e | 2.466*** | 0.903 | 2.519*** | 0.443 | 2.519*** | 0.160 | 2.604*** | − 0.107 | |
Wyl | a | 4.942*** | 0.279 | 5.157*** | − 0.508 | 5.211*** | − 0.983 | 5.272*** | − 1.319 |