Ecological Archives E096-219-A2

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/10.1890/15-0188.1

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
(<0.001)

0.29
(0.02)

▲0.05
(0.44)

▲0.01
(0.75)

0.36
(0.01)

▼0.01
(0.74)

▼0.07
(0.31)

▲0.12
(0.13)

▼0
(0.97)

Soil C pool (g/m²)

▲0.80
(<0.001)

 

▲0.15
(0.11)

▼0.03
(0.56)

0.05
(0.39)

0.38
(0.01)

0.01
(0.69)

0.08
(0.26)

0.15
(0.09)

0.03
(0.50)

Recycleable soil P pool (g/m²)

0.28
(0.03)

0.16
(0.10)

 

▲0.09
(0.23)

▲0.02
(0.60)

▲0.10
(0.22)

▲0.04
(0.41)

▲0.10
(0.21)

▲0.07
(0.29)

▲0.02
(0.08)

Recycleable + apatite soil P pool (g/m²)

▲0
(0.85)

▼0.02
(0.39)

0.05
(0.06)

 

0.83
(<0.001)

▲0.02
(0.50)

▲0.01
(0.60)

0.10
(0.04)

▲0
(0.83)

▲0.08
(0.28)

Total soil P pool (g/m²)

▼0.
(0.92)

▼0
(0.31)

▼0.06
(0.12)

0.90
(<0.001)

 

▼0.02
(0.51)

▼0
(0.93)

0.22
(<0.01)

▲0.02
(0.49)

0.40
(0.01)

N mineralization Oe horizon (µg·g-1·d-1)

0.27
(0.02)

0.28
(0.02)

▼0.50
(0.33)

▼0.03
(0.55)

▼0.03
(0.52)

 

▲0.1
(0.65)

▼0.05
(0.33)

▲0.01
(0.62)

▲0
(0.87)

N mineralization Oa horizon (µg·g-1·d-1)

▼0
(0.82)

▼0.01
(0.76)

▲0.04
(0.44)

▲0.01
(0.69)

▼0
(0.91)

▲0.03
(0.49)

 

▼0.06
(0.31)

0.26
(0.03)

▲0.02
(0.60)

Resin available P Oe horizon (µg/g)

▼0.04
(0.41)

▼0.03
(0.43)

▼0.08
(0.21)

0.17
(0.09)

0.28
(0.01)

▼0.08
(0.26)

▼0
(0.81)

 

0.18
(0.05)

▲0
(0.99)

Resin available P Oa horizon (µg/g)

▲0.13
(0.13)

0.15
(0.09)

▲0.06
(0.32)

▲0.01
(0.68)

▲0.09
(0.24)

▲0.02
(0.58)

0.25
(0.03)

0.23
(0.05)

 

▲0.08
(0.30)

Bicarbonate extractable P Oa horizon (µg/g)

▼0
(0.73)

▼0.01
(0.62)

▲0.04
(0.28)

▲0.28
(0.05)

▼0 (0.95)

▲0
(0.77)

▲0.02
(0.41)

▼0
(0.85)

▼0.0
(0.76)

 

 

 

 

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
(0.03)

0.49
(0.32)

0.45
(0.37)

0.66
(0.16)

0.23
(0.66)

-.58
(0.23)

0.39
(0.44)

0.25
(0.63)

Soil C pool (g/m²)

1

0.48
(0.34)

-0.02
(0.97)

-0.08
(0.88)

0.70
(0.12)

0.28
(0.59)

-0.65
(0.17)

0.10
(0.85)

-0.28
(0.59)

Recycleable soil P pool (g/m²)

 

1

0.80
(0.05)

0.81
(0.05)

0.44
(0.39)

0.01
(0.98)

-0.31
(0.56)

0.62
(0.19)

0.66
(0.15)

Recycleable + apatite soil P pool (g/m²)

 

 

1

0.97
(0.001)

-0.07
(0.90)

0.05
(0.93)

-0.15
(0.78)

0.37
(0.47)

0.90
(0.02)

Total soil P pool (g/m²)

 

 

 

1

-0.06
(0.91)

-0.06
(0.91)

0.04
(0.93)

0.57
(0.24)

0.96
(<0.01)

N mineralization Oe horizon (µg·g-1·d-1)

 

 

 

 

1

0.37
(0.47)

-0.59
(0.22)

0.20
(0.70)

-0.13
(0.80)

N mineralization Oa horizon (µg·g-1·d-1)

 

 

 

 

 

1

-0.65
(0.16)

-0.46
(0.36)

0
(0.99)

Resin available P Oe horizon (µg/g)

 

 

 

 

 

 

1

0.47
(0.34)

0.19
(0.72)

Resin available P Oa horizon (µg/g)

 

 

 

 

 

 

 

1

0.55
(0.25)


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