Tree response | Individual MDS parameters | Step-wise models | USQI (PC1 ≈ OM, pH) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Sand (%) | Silt (%) | Clay (%) | WAS (%) | ρb (Mg m−3) | pH | EC (dS m−1) | SOM (%) | POM (%) | r-value | Parameters | ||
Age (yr) | 0.12 | 0.38** | −0.44*** | 0.40** | −0.36** | −0.71*** | −0.52*** | 0.53*** | 0.47*** | 0.75*** | pH, POM | 0.78*** |
Trunk diameter (cm) | 0.07 | 0.54*** | −0.58*** | 0.36** | −0.39** | −0.72*** | −0.56*** | 0.54*** | 0.42*** | 0.78*** | Clay, pH, POM | 0.77*** |
Height (m) | 0.10 | 0.46*** | −0.51*** | 0.29** | −0.32** | −0.68*** | −0.53*** | 0.51*** | 0.45*** | 0.73*** | Clay, pH, POM | 0.75*** |
Crown area (m2) | 0.10 | 0.46*** | −0.51*** | 0.24* | −0.36** | −0.61*** | −0.50*** | 0.54*** | 0.43*** | 0.70*** | Clay, WAS, pH, SOM | 0.65*** |
Trunk diameter growth rate (mm yr−1) | −0.14 | 0.41** | −0.37** | 0.03 | −0.22* | −0.23* | −0.30** | 0.21 | 0.09 | 0.46*** | WAS, SOM | 0.41*** |
Height growth rate (m yr−1) | 0.01 | −0.11 | 0.11 | −0.33** | 0.23* | 0.34** | 0.17 | −0.38** | −0.25* | −0.41** | Silt, EC, POM | −0.35** |
Leaf chlorophyll (SPAD) | −0.09 | 0.34** | −0.32** | 0.24* | −0.09 | −0.23* | −0.09 | 0.21 | 0.27* | 0.40*** | Silt, WAS | 0.32** |
Leaf N (%) | 0.39** | 0.16 | −0.30** | 0.24* | −0.11 | −0.63*** | −0.51*** | 0.35** | 0.05 | 0.73*** | Sand, pH, POM | 0.42*** |
Tree condition index | 0.04 | 0.30** | −0.32** | −0.17 | −0.01 | −0.24* | −0.14 | 0.01 | 0.11 | 0.48** | Clay, WAS, pH, SOM | 0.18 |
PC1 ≈ tree size | 0.12 | 0.51*** | −0.57*** | 0.32** | −0.36** | −0.73*** | −0.57*** | 0.53*** | 0.43*** | 0.79*** | Clay, pH, POM | 0.73*** |
PC2 ≈ tree growth | −0.15 | 0.16 | −0.11 | −0.23* | 0.10 | 0.20 | 0.10 | −0.19 | −0.10 | 0.36* | Silt, WAS, pH | 0.31* |
↵zWet-aggregate stability (WAS), bulk density (ρb), electrical conductivity (EC), nitrogen (N), soil organic matter (SOM), and particulate organic matter (POM), minimum data set (MDS), urban soil quality index (USQI), and principal component (PC). Step-wise models are created from nine MDS soil parameters. One asterisk (*) is P < 0.05, two asterisks (**) is P < 0.01, and three asterisks (***) is P < 0.0001.