Ecological Archives A016-024-A2

Nancy E. Golubiewski. 2006. Urbanization increases grassland carbon pools: effects of landscaping in Colorado's Front Range. Ecological Applications 16:555–571.

Appendix B. Spearman rank correlation tables.

Spearman rank correlations among grass variables and site and soil variables [*] .

 

Production (g/m2)

Harvested biomass (g/m2)

C (%)

N (%)

C:N

Harvested C (g/m2)

Harvested N (g/m2)

Stubble biomass (g/m2)

Stored C (g/m2)

Year built

NS [†]

 

NS

 

NS

 

-0.47

(0.002)

0.47

(0.003)

NS

 

NS

 

NS

 

NS

 

SOC (%) (0-10 cm)

NS

 

NS

 

NS

 

0.63

(0.009)

-0.59

(0.016)

0.51

(0.044)

0.58

(0.019)

NS

 

NS

 

Soil N (%) (0-10 cm)

NS

 

NS

 

NS

 

0.59

(0.017)

-0.53

(0.036)

NS

 

0.50

(0.049)

NS

 

NS

 

Total soil C (%) (0-10 cm)

NS

 

NS

 

NS

 

0.63

(0.009)

-0.59

(0.015)

NS

 

0.54

(0.033)

NS

 

NS

 

SOM (%) (0-10 cm)

NS

 

NS

 

NS

 

0.61

(0.011)

-0.56

(0.024)

NS

 

0.52

(0.039)

NS

 

NS

 

SOM (%) (10-20 cm)

NS

 

NS

 

0.53

(0.041)

0.59

(0.021)

-0.59

(0.020)

NS

 

NS

 

NS

 

NS

 

SOM (%) (20-30 cm)

NS

 

NS

 

NS

 

0.60

(0.025)

-0.60

(0.022)

NS

 

NS

 

NS

 

NS

 

Inorganic C (%) (10-20 cm)

-0.52

(0.027)

-0.54

(0.020)

NS

 

NS

 

NS

 

-0.60

(0.017)

NS

 

NS

 

NS

 

Inorganic C (%) (20-30 cm)

-0.61

(0.010)

-0.69

(0.002)

NS

 

NS

 

NS

 

-0.64

(0.013)

NS

 

NS

 

NS

 

pH (0-10 cm)

NS

 

NS

 

NS

 

-0.57

(0.022)

0.53

(0.034)

NS

 

NS

 

NS

 

NS

 

pH (20-30 cm)

-0.52

(0.033)

-0.52

(0.031)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

Sand (%) (20-30 cm)

NS

 

NS

 

-0.74

(0.006)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

Silt (%) (20-30 cm)

NS

 

NS

 

0.83

(0.001)

NS

 

-0.58

(0.048)

NS

 

NS

 

NS

 

NS

 

Bulk Density (Mg/m3) (10-20 cm)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

0.7

(<.05)

0.7

(<.05)

[*] Significant correlations (P < 0.05) are followed by P values in parentheses. Site variables were correlated to means of plot replicates for a single lawn; soil variables were matched to the plot from which they were taken.

[†] Nonsignificant correlations are denoted by NS.


Spearman rank correlations among tree variables and site and soil variables. [3]

 

Density (stems/ha)

Biomass (kg/ha)

Year built

-0.42

(0.002)

-0.66

(<.0001)

SOC (%) (20-30 cm)

-0.62

(0.018)

NS [4]

 

pH (10-20 cm)

0.53

(0.049)

NS

 

Total Bulk density (Mg/m3) (10-20 cm)

NS

 

-0.62

(0.025)

Fine Bulk Density (Mg/m3) (10-20 cm)

NS

 

-0.66

(0.014)

Coarse Fraction (%) (20-30 cm)

NS

 

-0.69

(0.007)

Silt (%) (0-10 cm)

NS

 

0.56

(0.037)

[3] Significant correlations (P < 0.05) are shown followed by P values in parentheses. Woody vegetation data from all sites were used for correlations to site, and only data from those sites where soil samples were taken were used for correlations to site variables.

[4] Nonsignificant correlations are denoted by NS.

Spearman rank correlations among soil variables as well as among soil and site variables. Soil response variables are listed down the left side. The first line for each soil response variable shows the correlation for pooled soil variables. The following three lines show the correlation for soil response variables by depth. [5]

 

soil N

pH

Total BD

Coarse fraction

Sand (%)

Silt (%)

Clay (%)

Year built

Northing

Easting

SOC

0.95

(<.0001)

-0.63

(<.0001)

-0.76

(<.0001)

NS [6]

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

0-10 cm

0.95

(<.0001)

-0.76

(<.0001)

-0.72

(<.0001)

NS

 

NS

 

NS

 

NS

 

-0.66

(0.011)

NS

 

NS

 

10-20 cm

0.95

(<.0001)

-0.61

(<.0001)

-0.56

(0.002)

NS

 

NS

 

NS

 

NS

 

-0.62

(0.019)

NS

 

-0.59

(0.027)

20-30 cm

0.85

(<.0001)

-0.50

(<.0001)

-0.59

(0.002)

NS

 

NS

 

NS

 

NS

 

NS

 

0.55

(0.043)

NS

 

SOM

0.89

(<.0001)

-0.55

(<.0001)

-0.74

(<.0001)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

0-10 cm

0.94

(<.0001)

-0.73

(<.0001)

-0.73

(<.0001)

NS

 

NS

 

NS

 

NS

 

-0.73

(0.003)

NS

 

NS

 

10-20 cm

0.78

(<.0001)

-0.39

(0.002)

-0.66

(0.000)

NS

 

NS

 

NS

 

NS

 

-0.64

(0.015)

NS

 

NS

 

20-30 cm

0.84

(<.0001)

-0.46

(0.000)

-0.57

(0.003)

NS

 

NS

 

NS

 

NS

 

-0.69

(0.006)

NS

 

NS

 

Inorganic C

-0.26

(0.000)

0.46

(<.0001)

NS

 

0.22

(0.002)

-0.43

(<.0001)

0.38

(0.001)

0.41

(0.000)

NS

 

NS

 

NS

 

0-10 cm

-0.24

(0.041)

0.41

(0.000)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

10-20 cm

-0.47

(<.0001)

0.50

(<.0001)

NS

 

NS

 

-0.55

(0.004)

0.57

(0.002)

0.50

(0.010)

NS

 

NS

 

NS

 

20-30 cm

-0.26

(0.049)

0.51

(<.0001)

NS

 

0.34

(0.011)

-0.41

(0.042)

NS

 

0.40

(0.046)

NS

 

NS

 

NS

 

SOC:N

n/a

 

-0.35

(<.0001)

-0.46

(<.0001)

NS

 

NS

 

-0.23

(0.042)

NS

 

NS

 

NS

 

NS

 

0-10 cm

   

-0.33

(0.006)

-0.41

(0.039)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

10-20 cm

   

-0.33

(0.010)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

-0.64

(0.015)

20-30 cm

   

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

0.72

(0.004)

NS

 

Soil N

n/a

 

-0.67

(<.0001)

-0.74

(<.0001)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

0-10 cm

   

-0.76

(<.0001)

-0.68

(<.0001)

NS

 

NS

 

NS

 

NS

 

-0.71

(0.005)

NS

 

NS

 

10-20 cm

   

-0.65

(<.0001)

-0.60

(0.001)

NS

 

NS

 

NS

 

NS

 

-0.74

(0.003)

NS

 

NS

 

20-30 cm

   

-0.63

(<.0001)

-0.61

(0.001)

NS

 

NS

 

NS

 

NS

 

-0.75

(0.002)

NS

 

NS

 

pH

   

n/a

 

0.49

(<.0001)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

0-10 cm

       

0.49

(0.001)

NS

 

NS

 

NS

 

NS

 

0.77

(0.001)

NS

 

NS

 

10-20 cm

       

0.54

(0.003)

NS

 

NS

 

NS

 

NS

 

0.65

(0.012)

NS

 

NS

 

20-30 cm

       

NS

 

NS

 

NS

 

NS

 

NS

 

0.58

(0.031)

NS

 

NS

 

Total BD

       

n/a

 

0.25

(0.012)

NS

 

NS

 

NS

 

NS

 

NS

 

NS

 

0-10 cm

           

NS

 

NS

 

NS

 

NS

 

0.75

(0.003)

NS

 

NS

 

10-20 cm

           

0.47

(0.011)

NS

 

NS

 

NS

 

0.77

(0.002)

NS

 

NS

 

20-30 cm

           

NS

 

NS

 

NS

 

NS

 

0.71

(0.010)

NS

 

NS

 

[5] Significant correlations (P < 0.05) are shown followed by P values in parentheses. For correlations among soil variables, individual soil cores were examined; for correlations to soil texture, pooled soil cores by cover type were used; and for correlations to site variables, all replicates were pooled regardless of cover type.

[6] Nonsignificant correlations are denoted by NS.



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