Ecological Archives E096219A2
Craig R. See, Ruth D. Yanai, Melany C. Fisk, Matthew A. Vadeboncoeur, Braulio A. Quintero, Timothy J. Fahey. 2015. Soil nitrogen affects phosphorus recycling: foliar resorption and plant–soil feedbacks in a northern hardwood forest. Ecology 96:2488–2498. http://dx.doi.org/10.1890/150188.1
Appendix B. Relationship between soil predictor variables.
Table B1. Mixed model treating stand treating stand as a random effect (n = 18). Marginal R² values indicate the percentage of variation in the response variable explained by the predictor. Arrows indicate the direction of the relationship, with arrows pointing up indicating a positive effect, and arrows pointing down indicating a negative effect. P values for the coefficient is isted in parentheses. Dependent variables are listed in rows, independent variables in columns.

Soil N pool (g/m²) 
Soil C pool (g/m²) 
Recycleable soil P pool (g/m²) 
Recycleable + apatite soil P pool (g/m²) 
Total soil P pool (g/m2) 
N mineralization Oe horizon (µg·g^{1}·d^{1}) 
N mineralization Oa horizon (µg·g^{1}·d^{1}) 
Resin available P Oe horizon (µg/g) 
Resin available P Oa horizon (µg/g) 
Bicarbonate extractable P Oa horizon (µg/g) 

Soil N pool (g/m²) 

▲0.79 
▲0.29 
▲0.05 
▲0.01 
▲0.36 
▼0.01 
▼0.07 
▲0.12 
▼0 

Soil C pool (g/m²) 
▲0.80 

▲0.15 
▼0.03 
▼0.05 
▲0.38 
▼0.01 
▼0.08 
▲0.15 
▼0.03 

Recycleable soil P pool (g/m²) 
▲0.28 
▲0.16 

▲0.09 
▲0.02 
▲0.10 
▲0.04 
▲0.10 
▲0.07 
▲0.02 

Recycleable + apatite soil P pool (g/m²) 
▲0 
▼0.02 
▼0.05 

▲0.83 
▲0.02 
▲0.01 
▲0.10 
▲0 
▲0.08 

Total soil P pool (g/m²) 
▼0. 
▼0 
▼0.06 
▲0.90 

▼0.02 
▼0 
▲0.22 
▲0.02 
▲0.40 

N mineralization Oe horizon (µg·g^{1}·d^{1}) 
▲0.27 
▲0.28 
▼0.50 
▼0.03 
▼0.03 

▲0.1 
▼0.05 
▲0.01 
▲0 

N mineralization Oa horizon (µg·g^{1}·d^{1}) 
▼0 
▼0.01 
▲0.04 
▲0.01 
▼0 
▲0.03 

▼0.06 
▼0.26 
▲0.02 

Resin available P Oe horizon (µg/g) 
▼0.04 
▼0.03 
▼0.08 
▲0.17 
▲0.28 
▼0.08 
▼0 

▲0.18 
▲0 

Resin available P Oa horizon (µg/g) 
▲0.13 
▲0.15 
▲0.06 
▲0.01 
▲0.09 
▲0.02 
▼0.25 
▲0.23 

▲0.08 

Bicarbonate extractable P Oa horizon (µg/g) 
▼0 
▼0.01 
▲0.04 
▲0.28 
▼0 (0.95) 
▲0 
▲0.02 
▼0 
▼0.0 

Table B2. Simple linear regression of stand means (n = 6). Correlations are reported as Pearson’s R, with P values reported in parentheses.

Soil C pool (g/m²) 
Recycleable soil P pool (g/m²) 
Recycleable + apatite soil P pool (g/m²) 
Total soil P pool (g/m²) 
N mineralization Oe horizon (µg·g^{1}·d^{1}) 
N mineralization Oa horizon (µg·g^{1}·d^{1}) 
Resin available P Oe horizon (µg/g) 
Resin available P Oa horizon (µg/g) 
Bicarbonate extractable P Oa horizon (µg/g) 

Soil N pool (g/m²) 
0.85 (0.03) 
0.86 
0.49 
0.45 
0.66 
0.23 
.58 
0.39 
0.25 

Soil C pool (g/m²) 
1 
0.48 
0.02 
0.08 
0.70 
0.28 
0.65 
0.10 
0.28 

Recycleable soil P pool (g/m²) 

1 
0.80 
0.81 
0.44 
0.01 
0.31 
0.62 
0.66 

Recycleable + apatite soil P pool (g/m²) 


1 
0.97 
0.07 
0.05 
0.15 
0.37 
0.90 

Total soil P pool (g/m²) 



1 
0.06 
0.06 
0.04 
0.57 
0.96 

N mineralization Oe horizon (µg·g^{1}·d^{1}) 




1 
0.37 
0.59 
0.20 
0.13 

N mineralization Oa horizon (µg·g^{1}·d^{1}) 





1 
0.65 
0.46 
0 

Resin available P Oe horizon (µg/g) 






1 
0.47 
0.19 

Resin available P Oa horizon (µg/g) 







1 
0.55 