Ecological Archives E090-122-A2

James E. Bedison and Brenden E. McNeil. 2009. Is the growth of temperate forest trees enhanced along an ambient nitrogen deposition gradient? Ecology 90:1736–1742.

Appendix B. A table listing the woody biomas increments response to N deposition.

TABLE B1. Stratified woody biomass increment (WBI, kg yr-1) response of tree species to atmospheric nitrogen deposition (kg N ha-1 yr-1). Regressions on log10 transformed data.

Species

Size class*

Forest   type

N

Mean response

P value

R2

m

Growth response index§

WBI

               

All

1

All

638

0.19

<0.0001

0.03

0.12

17

All

2

All

206

0.74

0.05

0.02

0.11

85

All

All

NH

727

0.50

0.001

0.02

0.11

37

All

All

SF

385

0.42

0.008

0.02

0.15

39

All

1

SF

182

0.19

<0.0001

0.08

0.31

42

All

2

SF

110

0.54

0.002

0.09

0.25

93

All

1

NH

455

0.19

0.0005

0.03

0.10

14

Acer rubrum

1

NH

39

0.25

0.0002

0.31

0.45

74

Acer rubrum

All

NH

56

0.46

<0.0001

0.26

0.46

135

Abies balsamea

1

SF

118

0.18

<0.0001

0.17

0.44

59

Abies balsamea

1

All†

168

0.13

<0.0001

0.21

0.30

34

Abies balsamea

All

All

302

0.29

<0.0001

0.06

0.21

39

Picea  rubens

1

NH

55

0.26

<0.0001

0.29

0.72

124

*Size classes are defined as: 1; 2.0-9.9, 2; 10.0-14.9, 3; 15.0-19.9, 4; 20.0-24.9, 5; 25.0-29.9, 6; ≥ 30.0 cm dbh.

§Calculated as the ratio of the slope to the absolute value of the log of the mean response, multiplied by 100.

†Balsam fir stems in both northern hardwood and spruce/fir plots.

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