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Table 2 Results of statistics (general linear model, GLM)

From: Warming and neighbor removal affect white spruce seedling growth differently above and below treeline

Factor

 

Habitat type (H)

Temperature (T)

Removal (R)

H*T

H*R

T*R

H*T*R

F

P

F

P

F

P

F

P

F

P

F

P

F

P

Size measurements

Ndf: 2

Ddf:144

Ndf: 1

Ddf:144

Ndf: 1

Ddf:144

Ndf: 2

Ddf:144

Ndf: 2

Ddf:144

Ndf: 1

Ddf:144

Ndf: 2

Ddf:144

(1) RGR Height†

9.51

0.0001

11.26

0.001

0.23

0.633

15.43

<0.0001

1.96

0.145

5.05

0.026

1.43

0.244

(2) RGR # of needles†

28.14

<0.0001

1.79

0.183

9.22

0.003

3.70

0.027

1.47

0.232

0.50

0.480

0.71

0.493

(3) RGR Needle length‡

7.10

0.0011

0.19

0.664

0.61

0.438

1.72

0.182

0.18

0.837

0.06

0.807

0.97

0.380

á…Ÿ

Photosynthesis

Ndf: 2

Ddf:143

Ndf: 1

Ddf:143

Ndf: 1

Ddf:143

Ndf: 2

Ddf:143

Ndf: 2

Ddf:143

Ndf: 1

Ddf:143

Ndf: 2

Ddf:143

(4) Photosynthesis*

32.43

<0.0001

0.01

0.9312

0.44

0.510

52.92

<0.0001

1.24

0.2916

4.22

0.042

0.65

0.523

á…Ÿ

% N and 13C

Ndf: 2

Ddf:47

Ndf: 1

Ddf:47

Ndf: 1

Ddf:47

Ndf: 2

Ddf:47

Ndf: 2

Ddf:47

Ndf: 1

Ddf:47

Ndf: 2

Ddf:47

(5) %N**

5.80

<0.0001

0.12

0.735

7.19

0.010

1.91

0.160

1.55

0.223

0.05

0.826

1.13

0.333

(6)13C

8.01

0.001

10.27

0.002

0.39

0.536

4.80

0.013

0.44

0.646

0.85

0.361

0.17

0.200

á…Ÿ

ANCOVA

Ndf: 2

Ddf:46

Ndf: 1

Ddf:46

Ndf: 1

Ddf:46

Ndf: 2

Ddf:46

Ndf: 2

Ddf:46

Ndf: 1

Ddf:46

Ndf: 2

Ddf:46

(7) %N**

5.95

0.0051

0.38

0.543

0.13

0.719

37.58

<0.0001

1.15

0.324

0.44

0.512

0.39

0.680

(8)13C

16.57

<0.0001

0.60

0.441

0.50

0.481

36.87

<0.0001

0.91

0.409

0.57

0.456

0.19

0.832

  1. †rank, ‡yt = y/s, *log(y + 1), and **log (y) transformation to achieve homogeneity of variance. (Bold: P < 0.05).
  2. Three-way ANOVA for relative growth rates (RGR) in (1) height, (2) number of needles, (3) length of the longest needle for size measurements; (4) photosynthetic rate, (5)%N and (6) δ13C. ANCOVA for photosynthetic rate with (7)%N and (8) δ13C. The interactions between the treatments were shown; e.g., H*T (habitat type and temperature). Significant differences were bold. Data were collected from 156 seedlings (one failed for photosynthesis, n = 155). ANCOVA was run using a subset of seedlings (n = 59). Transformation methods were suggested by Dr. J. McIntyre of Department of Mathematics and Statistics, UAF.
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