Ecological Archives E096-219-A2

Craig R. See, Ruth D. Yanai, Melany C. Fisk, Matthew A. Vadeboncoeur, Braulio A. Quintero, and 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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