224 Scharenbroch and Catania: Soil Quality Attributes as Indicators of Urban Tree Performance ©2012 International Society of Arboriculture Table 7. Correlations (r-values) between the urban soil MDS parametersz Age (yr) Trunk diameter (cm) Height (m) Crown area (m2) Trunk diameter growth rate (mm yr-1 Height growth rate (m yr-1 ) Leaf chlorophyll (SPAD) Leaf N (%) Tree condition index PC1 ≈ tree size PC2 ≈ tree growth -0.09 0.39** 0.04 0.12 -0.15 0.34** 0.16 0.30** 0.51*** 0.16 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. z Wet-aggregate stability (WAS), bulk density (ρb -0.32** -0.30** -0.32** -0.57*** -0.11 ) Individual MDS parameters Sand (%) Silt (%) 0.12 0.38** 0.07 0.10 0.10 -0.14 0.01 0.54*** 0.46*** 0.46*** 0.41** -0.11 , urban soil quality index, individual tree responses, and principal components derived from nine tree response variables. Data from 84 plots in western suburban Chicago, IL. Tree response Clay (%) WAS (%) ρb -0.44*** -0.58*** -0.51*** -0.51*** -0.37** 0.40** 0.36** 0.29** 0.24* 0.03 0.11 -0.33** 0.24* 0.24* -0.17 0.32** -0.23* (Mg m-3 -0.36** -0.39** -0.32** -0.36** -0.22* 0.23* -0.09 -0.11 -0.01 -0.36** 0.10 ) pH -0.71*** -0.72*** -0.68*** -0.61*** -0.23* 0.34** -0.23* -0.63*** -0.24* -0.73*** 0.20 EC (dS m-1 -0.52*** -0.56*** -0.53*** -0.50*** -0.30** 0.17 -0.09 -0.51*** -0.14 -0.57*** 0.10 0.54*** 0.51*** 0.54*** 0.21 -0.38** 0.21 0.35** 0.01 0.53*** -0.19 0.47*** 0.42*** 0.45*** 0.43*** 0.09 Step-wise models ) SOM (%) POM (%) r-value 0.53*** Parameters 0.75*** pH, POM 0.78*** Clay, pH, POM 0.73*** Clay, pH, POM -0.25* 0.27* 0.05 0.11 0.43*** -0.10 -0.41** Silt, EC, POM 0.40*** Silt, WAS 0.73*** Sand, pH, POM 0.48** 0.79*** Clay, pH, POM 0.36* 0.78*** 0.77*** 0.75*** 0.70*** Clay, WAS, pH, SOM 0.65*** 0.46*** WAS, SOM 0.41*** -0.35** 0.32** Clay, WAS, pH, SOM 0.18 Silt, WAS, pH 0.42*** 0.73*** 0.31* ), electrical conductivity (EC), nitrogen (N), soil organic matter (SOM), and particulate organic matter (POM), minimum data set (MDS), urban soil quality index (USQI), USQI (PC1 ≈ OM, pH)
September 2012
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